登录注册
主页关于 MindatMindat手册Mindat的历史版权Who We Are联系我们于 Mindat.org刊登广告
捐赠给 MindatCorporate Sponsorship赞助板页已赞助的板页在 Mindat刊登 广告的广告商于 Mindat.org刊登广告
Learning CenterWhat is a mineral?The most common minerals on earthInformation for EducatorsMindat ArticlesThe Elements书籍及杂志
搜索矿物的性质搜索矿物的化学Advanced Locality Search随意显示任何一 种矿物Random Locality使用minID搜索邻近产地Search Articles搜索词汇表更多搜索选项
搜索:
矿物名称:
地区产地名称:
关键字:
 
Mindat手册添加新照片Rate Photos产区编辑报告Coordinate Completion Report添加词汇表项目
Mining Companies统计会员列表Mineral Museums矿物展及活动The Mindat目录表设备设置
照片搜索Photo Galleries今天最新的照片昨天最新的照片用户照片相集过去每日精选照片相集Mineral Photography

Bagdad-Chase Mine (Barstow mill; Camp Rochester; Pacific Mine; Pacific Mines; Roosevelt Consolidated Mine; Buckeye-Stedman-Bagdad Chase Mine), Stedman, Stedman District (Ludlow; Rochester; Buckeye), Bullion Mts (Bullion Range), San Bernardino Co., California, USAi
Regional Level Types
Bagdad-Chase Mine (Barstow mill; Camp Rochester; Pacific Mine; Pacific Mines; Roosevelt Consolidated Mine; Buckeye-Stedman-Bagdad Chase Mine)Mine
Stedman- not defined -
Stedman District (Ludlow; Rochester; Buckeye)Mining District
Bullion Mts (Bullion Range)Mountain Range
San Bernardino Co.County
CaliforniaState
USACountry

This page is currently not sponsored. Click here to sponsor this page.
Key
Latitude & Longitude (WGS84):
34° 37' 39'' North , 116° 10' 1'' West
Latitude & Longitude (decimal):
Locality type:
Köppen climate type:


A former Au-Cu-Ag-Pb-Zn occurrence/mine and mill located in secs. 7 & 8, T6N, R8E, SBM, 0.3 km (0.2 mile) SSE of Stedman (7 miles S of Ludlow), on private (patented) land. Discovered in 1880. Property is comprised of 20 patented claims. Owned by Bagdad Chase, Inc. (2007). MRDS database stated accuracy for this location is 100 meters. Longitude and latitude represent the open pit mine symbol immediately above the name "Bagdad Chase Mine" on the Ludlow 7.5 minute quadrangle. Six mine shaft symbols are located within 0.1 mile NE to W of the open pit mine symbol. The mine is 47 miles by Interstate 40 east from Barstow to Ludlow, CA, then 7.6 miles south from Ludlow on Bagdad Chase Road. The historic townsite of Stedman is located 0.2 miles north of the mine on Bagdad Chase Road.

Ownership Information: Owned by Bagdad Chase Mining Company (100%), California (1990); owned by John Hobbs, present owner 1943, September (100%), California (1977); owned by Bagdad-Chase Inc. (100%), California (1978); owned by Clark Mining and Exploration (100%), California (1978); operated by Bagdad-Chase Ltd., California (1940-1943); D'Aix Syndicate (mined from 1938-1939), California (1938-1939); operated by Pacific Mines Corp. (mined from 1910-1916), California (1910-1916); owned by the Bagdad-Chase Mining Company (100%), California (1904-1910).

Year of Discovery: Copper and gold mineralization in the area of the current Bagdad-Chase and Roosevelt mines was discovered most likely around the early to late 1880's by John Suter, roadmaster for the Atlantic and Pacific subsidiary of the Santa Fe Railway. Discovery dates, which have been reported or which can be inferred from various sources, range from 1880 to 1903: 1880 (Mansfield, 2005); early 1890s (Ross, 2006); 1896 (Tucker, 1934b); 1898 (Feller, 2002); 1899 (USGS, MRDS); 1899 (Belden, 1952); 1903 (Tucker, 1917, 1934a).

Mining History: Suter was in the Bullion Mountains looking for a source of water for the railroad. The first mining district in the area was called the Buckeye Mining District. Suter sold his mines and claims in the early 1890s to stockholders of the New York Central Railroad, who organized the Bagdad Mining and Milling Company. 1901 -- 1910: the Bagdad Mining and Milling Company sent their first shipment of ore to the Randsburg-Santa Fe Reduction Company's stamp mill in Barstow in late 1901. The mill was equipped with fifty (50) 1,000-pound stamps and five regrinders, and had a cyanide plant with a capacity of 200 short tons of ore per day. The mill was owned by the same investors who purchased the Bagdad. The mill was originally built to handle ore from Randsburg. In addition to Suter's original Bagdad and Roosevelt mines, John R. Gentry had developed another productive mine that was purchased by the Benjamin E. Chase Gold Mining Company. Chase, who was president of the Central Bank of Rochester, New York, was also one of the investors in the Bagdad, and the companies merged to form the Bagdad Chase Gold Mining Company. For a time the Buckeye District was called the Rochester District in honor of the home of several of the investors. Chase was also president of the Ludlow and Southern Railway, which had been completed in 1903 to transport ore from the mine to the Santa Fe Railway at Ludlow. The combined mines were known as the Bagdad Chase. By 1905, the district was beginning to be called the Stedman District after the nearby mining town of Camp Rochester was renamed Stedman in honor of J. H. Stedman, Executive Secretary of the group of investors. From 1904, when mining began in earnest, to 1910, production from the Bagdad-Chase Mine reportedly amounted to 150,000 tons of ore with a total value of $4.5 million in gold produced, making the district the largest single source of gold in San Bernardino County. It was also the largest single source of copper in the County and yielded a significant amount of silver, as well. Between 1904 and 1910, the 150,000 tons of ore were hauled from the mine to Barstow where the ore was treated in a cyanide plant. Due to the presence of copper carbonates and silicates in the ore, gold recovery reportedly was about 55%. The ore also had an average reported value of $20.00 in gold per ton, and tailings' loss amounted to $5.00 in gold per ton (Tucker and Sampson, 1940; Tucker, 1934a).

With a gold price of $20.67 per troy ounce during the period 1904-1910, the reported $4.5 million in gold production amounts to ~217,700 troy ounces gold recovered. At 55% recovery, total gold content of the 150,000 tons of ore would be ~395,800 troy ounces and an ore grade of 2.639 troy ounces gold per ton. A tailings loss of $5.00 per ton in gold amounts to a loss of 0.242 troy ounces gold per ton for a total of 36,300 troy ounces gold lost to the tailings. [Approximately 130,000 tons of these tailings were available for reprocessing which began in 1932, and head samples reportedly assayed 0.155 troy ounces gold per ton (20,150 troy oz total gold; 18,740 troy ounces recoverable gold at 93% recovery; Tucker, 1934b)]. If the reported average value of $20.00 per ton of ore refers to gold recovered from the 150,000 tons of ore, the total amount and value of gold produced would be ~145,000 troy ounces (0.968 troy ounces gold per ton recovered) and $3 million, respectively. Using a total gold value of $25.00/ton ($20.00 recoverable plus $5.00 tailings loss), the average ore grade equates to 1.21 troy ounces gold per ton, which amounts to 181,500 troy ounces gold in 150,000 tons ore. Although the reported $20.00 per ton gold value of the ore and the $5.00 per ton loss in gold value to tailings are not consistent with the reported 55% recovery, the amount of gold produced (~145,000 troy ounces), the total gold content of the ore (181,500 troy ounces) and the corresponding grades (0.968 troy ounces gold per ton recovered, 1.21 troy ounces gold per ton of ore) are probably reasonable for the period 1904-1910. From the apparent inconsistencies in the reported figures given above for the period 1904-1910, either the dollar value ($4.5 million) of gold produced during 1904-1910 is overstated, or the amount of ore processed (150,000 tons) and/or the average per-ton value of the ore are understated. Although ore grades during the early period of mining (1904-1910) can be expected to be higher due to high-grading than during later years (1910-1916), using the $4.5 million value of gold recovered to estimate average ore grade for 1904-1910 gives a significantly higher average ore grade (2.639 troy ounces gold per ton) than reported from various other sources for the period 1910-1916: average ore grades of 0.159 to 0.486 troy ounces gold per ton for various blocks of ore mined from 1910-1916 (Tucker, 1934a); average of 0.35 troy ounces gold per ton mined from 1910-1916 (Tucker and Sampson, 1940, p 232). An upper limit on the estimate of gold recovered during 1904-1910 is ~217,700 troy ounces based on the reported $4.5 million value of gold produced and gold price of $20.67. The upper limit of total gold content for the 150,000 tons of ore processed in Barstow is ~395,800 troy ounces gold (average grade of 2.639 troy ounces Au/ton) based on the reported $4.5 million value of gold produced and reported 55% recovery. This MRDS reporter estimates that gold production and value of gold produced during 1904-1910 are probably on the order of ~145,000 troy ounces and $3 million, respectively. Total gold content in the 150,000 tons of ore is estimated to be ~181,500 troy ounces with average grade of ~1.21 troy ounces gold per ton.

Mining History (continued): 1910 to 1916: By early 1910 production and profits were down. The Bagdad Chase Gold Mining Company put its Stedman District operations up for sale, and the operations were purchased by the Pacific Mines Corporation in late 1910. Under the direction of mining engineer, John Hays Hammond, production was increased to 100 short tons of ore per day and the labor force increased to 75 men. The entire operation was modernized, and the ore was sent to Clarksdale (near Jerome), Arizona for processing. During this period, the mine reportedly produced $1.5 million in gold, silver, and copper. Production is reported at 120,000 tons ore. The average grade of ore mined and shipped was 0.35 troy oz Au/ton (42,000 troy oz Au), 1.5 troy oz silver/ton (180,000 oz Ag), 1.82% copper (2184 tons) (Tucker and Sampson, 1940, p. 232). By the end of 1915, the Bagdad Chase had four vertical shafts from 120 to 400 feet deep, one decline 450 feet long, and several thousand feet of levels, drifts, and crosscuts. The ore body measured 2000 feet long and 8 to 20 feet wide at the surface. By 1916, equipment had become worn and obsolete, and production and profits were again down; operations ceased and the mine went into receivership.

Mining History (continued): 1916 to the early 1930's: Bagdad Chase was not economically viable and remained predominantly idle with some high-grading. In 1926, Pacific Mines and Metals, Inc. was organized in Nevada, and one of the new company's goals was to arrange to place the Bagdad Chase group of mines on a paying basis again.

Mining History (continued): Early 1930,s to 1954: Starting in the early 1930s, Bagdad Chase was leased to several different parties who operated from time to time. 1932: In 1932, the Barstow Metals Extraction Co. began construction of a plant in Barstow to process Bagdad-Chase Mine tailings that were sent to the mill during the early 1900s (1904-1910). During this earlier period, 150,000 tons of ore were shipped to Barstow for processing, and the estimated tonnage of tailings available for treatment in 1932 was 130,000 tons. Head samples of tailings assayed: 0.155 troy oz gold/ton (20,150 troy oz Au total; 18,740 troy oz Au recoverable), 0.93 troy oz silver/ton (120,900 troy oz Ag total), and 0.70% copper (910 tons Cu total), with estimated recoveries of 93% of gold, 70% of silver, and 96% of copper. The estimated total value of gold, silver, and copper recovery was $4.69 per ton ($609,700 total; estimate $507,000 in Au) at a cost of $1.97 per ton (Tucker, 1934b). 1938 - 1939: the D'Aix Syndicate operated from 1938 to 1939 and reportedly shipped 850 short tons of ore to Magma Copper Company's smelter at Superior, Arizona; some shipments also went to American Smelting and Refining Company's smelter at Hayden, Arizona. The ore reportedly averaged $9.80/short ton in Au (0.28 troy oz Au/short ton; 238 oz Au total), $2.85/short ton in Ag, and 0.89% Cu (7.6 tons Cu Total). Total production in gold, silver, and copper up to 1940 was $6,013,000 (Tucker and Sampson, 1940, p. 232). 1939 - 1954: the Bagdad Chase was operated by Frank W. Royer from 1939 to 1943, and by Don L. Love beginning in 1943. Between 1943 and 1947 the lessee operated from the 125-foot shaft, stoping ore between the 90-foot level and the glory hole. Approximately 60,000 tons of ore were mined from this area. During 1947 and 1948 ore was mined from the 200-foot level in another vertical shaft. Early in 1949, the lessee worked in and around the old stopes on the 400-foot level of the inclined shaft (decline). The lessee reported mined 5000 tons ore in 1949, 2775 tons in 1950, and an average of one car (100-tons) per week during 1951 (Stewart, 1951). The Bagdad Chase was one of only four gold mines in California to be authorized to remain in production during World War II; the ore's silica content made it useful as a flux in smelting. Although not very profitable, the mine operated continuously from 1940 to 1954.

Mining and processing methods: Early high-grading of mineralized outcrops was followed by shaft-sinking [vertical and inclined (decline)], and underground drifting, stoping, and room and pillar mining. From 1901-1910, ore was processed by stamp mill, other crushing methods, and by cyanide plant in Barstow, California. From 1910-1916, ore was sent to a smelter in Clarksdale (near Jerome), Arizona for processing. In 1932 the Barstow Metals Extraction Co. began construction of a plant in Barstow to process Bagdad-Chase Mine tailings that were sent to the mill during the early 1900s. The tailings processing circuit included: tube mill grinder using Oceanside (San Diego Co.) pebbles; water washing; agitation using Dorr agitator and Pachucas (air agitation tanks); acid treatment (H2SO4 and HCl); neutralization with lime; addition of iron scrap and zinc shavings; Dorr thickeners; cyanide treatment; and filtering (Merrill filters). From 1938-1939, ore was shipped from the Bagdad Chase Mine to Magma Copper Company's smelter at Superior, Arizona; some shipments also went to American Smelting and Refining Company's smelter at Hayden, Arizona. Around 1972 Bagdad Chase, Inc. reportedly began open-pit operations at Stedman, which continued through 1975. In 1987, Bentley Resources, Vancouver, B. C., announced plans for extensive exploration and drilling around the Bagdad Chase, to bring the Bagdad Chase operations back into production, and to pour the first gold dore bar in the second quarter of 1988. Operation plans called for an annual production of 20,000 troy oz Au from three open pits: Bagdad, Middle Mine, and Roosevelt. Capital cost was estimated at $4.5 million; production costs were estimated at $152(U.S.). Test metallurgical work by Hazen Research Inc. showed ~95% gold recovery using an agitated vat cyanide leach. The ore was to be ground to 75% minus-200 mesh; final gold recovery was to be by the Merrill-Crowe system to produce gold dore bars. This MRDS reporter found no record of implementation of these plans. RECLAMATION The nature and amount of reclamation in the Bagdad-Chase Mine area is unknown to this MRDS Reporter; this can be determined by contacting the California Department of Conservation's Office of Mine Reclamation, Sacramento, CA, or the San Bernardino County, CA, Land Use Services Department (phone: 909-387-8311), which oversees mine reclamation; San Bernardino County is Lead Agency for mine reclamation. Satellite imagery and high-altitude aerial photographs from Google Earth and NASA World Wind 1.3 suggest that the mine is idle and has not been fully reclaimed; little if any equipment remains onsite. Open-pit workings (~1972-1975; possibly late 1980s): three relatively shallow pits (Bagdad, Middle Mine, and Roosevelt pits) and adjacent hillside excavations involving approximately 0.02 square mile of disturbed ground (estimated from satellite imagery and aerial photos from Google Earth and NASA World Wind 1.3).

Current Status: The mine appears to have been idle since about 1976 when the first open-pit mining operations reportedly ceased; some additional open-pit mining may have taken place during the late 1980's, but no record of late 1980's mining has been found by the USGS MRDS reporter.

Mineralization is a polymetallic deposit (Deposit occurrence model information: Model code: 129; USGS model code: 40a; Deposit model name: Detachment-fault-related polymetallic Cu-Au-Ag-Pb-Zn deposits) hosted in quartz-hematite hydrothermal volcanic breccia (agglomerate). The ore body is blanket shaped (mantos). Controls for ore emplacement included faulting and changes in pressure and temperature of the hydrothermal fluid. Local alteration includes propylitic, potassic & argillic. Associated rocks include Miocene rhyodacite & porphyry rhyodacite. Local rocks include Tertiary intrusive rocks (hypabyssal), unit 7 (Northern Mojave Desert).

Regional geologic structures include the Mojave Extensional Belt; Trans Mojave-Sierran shear zone and the Eastern California shear zone.

Ore materials include native gold, covellite, chalcopyrite, galena, chalcocite, chrysocolla, malachite, azurite and sphalerite. Gangue materials include quartz, specular hematite, altered rhyodacite breccia fragments and altered rhyodacite porphyry wall rock.

The Bagdad-Chase Mine is located in the northern part of the Bullion Terrane in the central Mojave Desert, southern Basin and Range Province. The mine is about 3 miles S of the Kane Springs Fault, a northeast-striking dominantly right-lateral internal transform fault zone that separates the Bullion Terrane south of the fault from the Daggett (extensional) Terrane north of the fault (Dokka, 1986). At its western limit, the strike of the Kane Springs fault curves to a northwesterly trend and becomes the western bounding "break-away" (detachment) fault of the Daggett Terrane. Strata in the Bullion Terrane dip 20-40ENE in contrast to beds in the Daggett Terrane, which dip 55-65SW. Just N of the Bagdad Chase Mine area, bedding appears from aerial photographs to dip to the southeast. In the area of the Bagdad Chase Mine, all of the surface exposures of the hydrothermal breccia have sharp hanging wall and footwall contacts with consistent northwest strike and 25-40NE dip. The central Mojave underwent extensional deformation preceded by and contemporaneous with basalt to rhyolite volcanism in Miocene time (Gans and others, 2005; Dokka, 1986; Walker and others, 1990; Dokka and others, 1998; Glazner and others, 2002). During late Cenozoic time, the central Mojave experienced three structurally different and temporally separated intervals of deformation (Dokka and others, 1998): 1. ~N-S directed opening of the ~24-21 Ma Mojave Extensional Belt (Dokka 1989; Ross, 1995). The northern Mojave Desert underwent extension beginning ~24 Ma; detachment faults accounted for much of the extension and locally exhumed mid-crustal rocks (metamorphic core complexes). 2. ~E-W striking, dextral shearing (~21-18 Ma) along the Trans Mojave-Sierran shear zone (Dokka and Ross, 1995, 1996, 1998). At ~20 Ma, the kinematics along the northern boundary changed from extension to dextral shear and minor extension in the Trans Mojave-Sierran shear zone, and rocks within this east-west trending zone (southern Sierra Nevada and the central Mojave Desert) were rotated about vertical axes as much as ~40-60 degrees clockwise. 3. ~13-0 Ma Eastern California shear zone (Dokka and Travis, 1990ab; Dokka, 1993). From ~13-0 Ma, the region has been subject to right-lateral shearing within the Eastern California shear zone, which accounts for the numerous active, right-lateral, dominantly strike-slip faults in the Mojave region. Although widely accepted that plate motions directly controlled Neogene deformation of coastal areas of the southern Cordillera (e.g., Luyendyk, 1991, cited in Dokka and Ross, 1995), application to the interior of the North American plate has been hampered by lack of clear-cut geometric and kinematic links to the global plate circuit, and the poor correlation of plate boundary type with interior deformation (Dokka and Ross, 1995). Current understanding suggests that early Miocene extension in east-central Nevada occurred in a back-arc setting east of the subducting Farallon Plate north of the Mendocino Triple Junction, while extension and concurrent basalt to rhyolite volcanism in southeastern California developed opposite and east of the transform that was active along the North American plate margin south of the Mendocino Triple Junction. The calc-alkaline suite of rocks commonly occurs along destructive plate margins, but is also associated with regions undergoing extension. Not all terranes with calc-alkaline rocks are associated with subduction zones (Sheth and others, 2002).

Mineralization at the Bagdad Chase is believed to be detachment-fault-related and of the same or slightly younger age as the deposit's associated presumed early Miocene-age rhyodacite porphyry intrusive rocks. Such deposits contain either copper-gold or lead-zinc-silver minerals that are typically found along low-angle normal faults (detachment faults) or along high-angle faults in the hanging walls of the detachment faults (Spencer and Welty, 1989, Long, 1992, cited in Tosdal and others, 1992, p. 38). Massive replacement bodies, breccias, and veins of specular hematite are characteristic of these deposits. Tosdal and others (1992, p. 38-39) classified base- and precious-metal deposits found in the extended terranes in the West Mojave Management Area, as detachment-fault-related polymetallic deposits (model 40a of Long, 1992). They included the Bagdad-Chase Mine as a possible example of this type of deposit. Previously, deposits in the Stedman Mining District have been included in the grade and short tonnage models for quartz-alunite systems (Mosier and Menzie, 1986, cited in Tosdal and others, 1992, p. 39). Tosdal and others (1992) cite Polovina (1980) and conclude that the character and texture of the Stedman ores are incompatible with the quartz-alunite deposit model. Age of Mineralization: Miocene -- contemporaneous with or somewhat younger than the enclosing rhyodacite porphyry wallrock; based on correlation of undated, altered rhyodacite porphyry wall rock with the Cady Mountain Dacite, which crops out 20 km (12,4 mi) to the north and has a potassium-argon date of 20.2 ?1.3 m.y. (Glazner, 1981, cited in Polovina, 1987, p. 46). . Host Rock: Hydrothermal quartz-hematite breccia consisting of poorly sorted, angular to subrounded fragments of argillically altered and leached rhyodacite, set in a fine-grained matrix of hydrothermal quartz and specular hematite. Host Rock Age: Miocene -- same as or younger than associated rhyodacite hypabyssal intrusives that may correlate with the Cady Mountain Dacite, which crops out 20 km (12.4 mi) to the north and has a potassium-argon date of 20.2 ?1.3 m.y. (Glazner, 1981, cited in Polovina, 1987, p. 46). Associated Rock Types: Rhyodacite porphyry intrusives. Host Rock Unit: Unnamed hydrothermal breccia. Host Rock Unit Age: Miocene -- contemporaneous with or slightly younger than rhyodacite porphyry wallrock; based on correlation of the rhyodacite porphyry wallrock with the Cady Mountain Dacite, which crops out 20 km (12.4 mi) to the north and has a potassium-argon date of 20.2 ?1.3 m.y. (Glazner, 1981, cited in Polovina, 1987, p. 46).

Tectonic Setting: The Bagdad-Chase Mine is located in the northern part of the Bullion Terrane in the central Mojave Desert, southern Basin and Range Province. Bagdad-Chase mineralization occurs mainly within a quartz-hematite, gold-silver-copper-bearing, hydrothermal breccia sill in association with Miocene-age hypabyssal rhyodacite porphyry intrusive rocks. In contrast to Miocene extension and concurrent calc-alkaline volcanism that was taking place in east-central Nevada in a back-arc setting east of the subducting Farallon Plate north of the Mendocino Triple Junction, contemporaneous Miocene extension and associated calc-alkaline volcanism in southeastern California (which includes the central Mojave) developed opposite and east of the transform that was active along the North American plate margin south of the Mendocino Triple Junction. The central Mojave underwent extensional deformation, preceded by and contemporaneous with basalt to rhyolite volcanism in Miocene time (Gans and others, 2005; Dokka, 1986; Walker and others, 1990; Dokka and others, 1998; Glazner and others, 2002). During late Cenozoic time, the central Mojave experienced three structurally different and temporally separated intervals of deformation (Dokka and others, 1998): 1. ~N-S directed opening of the ~24-21 Ma Mojave Extensional Belt (Dokka 1989; Ross, 1995). The northern Mojave Desert underwent extension beginning ~24 Ma; detachment faults accounted for much of the extension and locally exhumed mid-crustal rocks (metamorphic core complexes). 2. ~E-W striking, dextral shearing (~21-18 Ma) along the Trans Mojave-Sierran shear zone (Dokka and Ross, 1995, 1996, 1998). At ~20 Ma, the kinematics along the northern boundary changed from extension to dextral shear and minor extension in the Trans Mojave-Sierran shear zone, and rocks within this east-west trending zone (southern Sierra Nevada and the central Mojave Desert) were rotated about vertical axes as much as ~40-60 degrees clockwise. 3. ~13-0 Ma Eastern California shear zone (Dokka and Travis, 1990ab; Dokka, 1993). From ~13-0 Ma, the region has been subject to right-lateral shearing within the Eastern California shear zone, which accounts for the numerous active, right-lateral, dominantly strike-slip faults in the Mojave region.

Alteration: Propylitic, potassic, argillic.

Ore control(s): An incipient, presumably detachment-related, low-angle, normal fault cut across upper and lower propylitically-altered hypabyssal rhyodacite porphyry intrusive rocks. Potassium-rich, magmatic-hydrothermal fluids spread upward along fractures and laterally along the developing normal fault zone. A zone of potassic alteration formed along the fault and along fracture zones (incipient breccia pipes) in the footwall. The gouge zone that developed in the hanging wall eventually formed an effectively impermeable barrier to fluid migration into the hanging wall. Hydrothermal fluids, accumulating in a magma chamber, were subsequently forced out in several pulses, and rose along the faults and fractures. As the fluids neared the surface, a pressure and/or temperature differential between the magmatic fluids and the wall rock caused the wallrock to brecciate by thermal and/or hydraulic-fracturing mechanisms (Polovina, 1980b, cited in Polovina, 1987, P. 50). Brecciation was initially in the form of breccia pipes that developed in permeable, fractured rock within the lower rhyodacite. As the fluids reached the normal fault, they traveled laterally along it beneath the impermeable hanging wall gouge zone, brecciating the footwall to form a hydrothermal breccia blanket (or sill). Hydrothermal breccia fragments mixed with gouge at the base of the hanging wall indicate that some movement along the fault occurred after emplacement of the hydrothermal breccia sill. A primary geochemical dispersion halo, roughly coincident with the zone of potassic alteration, developed in the footwall adjacent to the hydrothermal breccia sill. Alternatively, the geochemical halo formed around the breccia sill in both the footwall and hanging wall rhyodacite, and subsequently a portion of the hanging wall that was not K-altered or mineralized was structurally juxtaposed upon the mineralized column.

Workings: Workings include surface and underground openings.

Workings Type: 1. Historic underground workings (1901-1954); 2. Open-pit workings: (~1972-1975). Description of Mine Workings:

1. Historic underground workings (1901-1954): 4+ vertical shafts from 125 to 400 feet deep; 450-foot, 40? (30? also reported), N 72? W- trending inclined shaft (decline); over 5000 feet of drifts and crosscuts at various levels (90-, 140-, 200-, 300-, and 400-foot levels); glory hole from the 90-foot level to the surface (working from the 125-foot shaft). Mining was by a modified method of coal mining using pillars (room and pillars), also post and head board occasionally, with practically no timbering.

2. Open-pit workings (~1972-1975): three relatively shallow pits (Bagdad, Middle Mine, and Roosevelt pits) and adjacent hillside excavations involving approximately 0.02 square mile of disturbed ground (estimated from satellite images and aerial photos from Google Earth and NASA World Wind 1.3).

Production and Reserves: (~9 metric tons Au produced; 5.2 metric tons open-pit reserves); plus Ag and Cu (amount undetermined). Reserves: 166,919 troy oz Au (~5.2 metric tons; 1,102,500 short tons ore grading 0.1514 oz Au/short ton; Northern Miner, April 1988). Total Production plus Reserves 1,846,500 to 1,902,500 short tons ~455,800 troy ounces (~14.2 metric tons) F. W. Royer, Consulting Engineer, Report on shipments made from property from 1910 to 1916 (Royer, cited in Tucker, 1934a): Dry short tons ore Gold troy oz/short ton Silver troy oz/short ton Copper % 98 0.159 0.700 0.35 8,951 0.425 2.124 3.47 39,600 0.324 1.755 2.31 19,970 0.403 1.357 1.04 5,555 0.486 1.356 1.46 29,513 0.333 1.177 1.26 103,687 Total 0.359 Av. 1.524 Av. 1.825 Av. 37,220 troy oz Au total 158,019 troy oz Ag total 1892 short tons Cu total Au:Ag ratio = 1:4.2 (~1:4) Tucker (1934a) reported the following "estimated available tonnage": Bagdad-Chase: 95,000 short tons 0.25 troy oz/st Au 0.90 troy oz/st Ag 1.23 % Cu Middle section: 50,000 short tons 0.30 troy oz/st Au 1.03 troy oz/st Ag 0.90 % Cu North section: 300,000 short tons 0.225 troy oz/st Au 1.00 troy oz/st Ag 1.10 % Cu Misc. sections: 25,000 short tons 0.45 troy oz/st Au 1.00 troy oz/st Ag 1.20 % Cu 470,000 short tons 0.25 troy oz/st Au 0.98 troy oz/st Ag 1.11% Cu (Average) (Average) 117,500 tr oz Au total 462,000 tr oz Ag total 5419 short tons Cu total Gold:silver ratio: ~1:4.

Production statistics: Year: 1916 (period = 1910-1916) (ore-accurate): ^1.82% Cu, 0.35 ounce Au/ton, 1.5 ounce Ag/ton. Recovery percentage:
Ag = 42 grams/metric ton; Au = 10 grams/metric ton; Cu = 2 weight percent.

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


27 valid minerals.

Detailed Mineral List:

Azurite
Formula: Cu3(CO3)2(OH)2
Reference: USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10310696.
Baryte
Formula: BaSO4
Reference: Bulletin of the Mineralogical Society of Southern California, Vol. 76 No. April 2006; Robert E.Walstrom Collection
Calcite
Formula: CaCO3
Reference: Bulletin of the Mineralogical Society of Southern California, Vol. 76 No. April 2006; Robert E.Walstrom Collection
Cerussite
Formula: PbCO3
Reference: Bulletin of the Mineralogical Society of Southern California, Vol. 76 No. April 2006; Robert M. Housley (2005) Recent rare mineral finds in southern California and Nevada desert mines. Abstracts from the 2005 Desert Symposium. California State University, Desert Studies Consortium and LSA Associates, Inc.; Robert E.Walstrom Collection
Chalcocite
Formula: Cu2S
Reference: USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10310696.
Chalcopyrite
Formula: CuFeS2
Reference: U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
Chlorargyrite
Formula: AgCl
Reference: USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10189217.
Chlorargyrite var: Iodian Bromian Chlorargyrite
Formula: Ag(Cl,Br,I)
Reference: USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10189217.
Chrysocolla
Formula: Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
Reference: Wright, L.A., et al (1953), Mines and mineral resources of San Bernardino County, California: California Journal of Mines and Geology: 49(1-2): 71-73; Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 144; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 514; Bulletin of the Mineralogical Society of Southern California, Vol. 76 No. April 2006; Robert E.Walstrom Collection
Conichalcite
Formula: CaCu(AsO4)(OH)
Reference: Bulletin of the Mineralogical Society of Southern California, Vol. 76 No. April 2006
Covellite
Formula: CuS
Reference: USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10310696.
Descloizite
Formula: PbZn(VO4)(OH)
Reference: Robert E.Walstrom Collection
Duftite
Formula: PbCu(AsO4)(OH)
Reference: Bulletin of the Mineralogical Society of Southern California, Vol. 76 No. April 2006; Robert M. Housley (2005) Recent rare mineral finds in southern California and Nevada desert mines. Abstracts from the 2005 Desert Symposium. California State University, Desert Studies Consortium and LSA Associates, Inc.; Robert E.Walstrom Collection
Galena
Formula: PbS
Reference: U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
Goethite
Formula: α-Fe3+O(OH)
Reference: Bulletin of the Mineralogical Society of Southern California, Vol. 76 No. April 2006; Robert M. Housley (2005) Recent rare mineral finds in southern California and Nevada desert mines. Abstracts from the 2005 Desert Symposium. California State University, Desert Studies Consortium and LSA Associates, Inc.
Gold
Formula: Au
Reference: Bulletin of the Mineralogical Society of Southern California, Vol. 76 No. April 2006
Hedyphane
Formula: Ca2Pb3(AsO4)3Cl
Reference: Bulletin of the Mineralogical Society of Southern California, Vol. 76 No. April 2006; Robert M. Housley (2005) Recent rare mineral finds in southern California and Nevada desert mines. Abstracts from the 2005 Desert Symposium. California State University, Desert Studies Consortium and LSA Associates, Inc.
Hematite
Formula: Fe2O3
Reference: Bulletin of the Mineralogical Society of Southern California, Vol. 76 No. April 2006; Robert M. Housley (2005) Recent rare mineral finds in southern California and Nevada desert mines. Abstracts from the 2005 Desert Symposium. California State University, Desert Studies Consortium and LSA Associates, Inc.
Hematite var: Specularite
Formula: Fe2O3
Reference: USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10310696.
Inyoite
Formula: Ca(H4B3O7)(OH) · 4H2O
Reference: USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10189217.
Malachite
Formula: Cu2(CO3)(OH)2
Reference: Bulletin of the Mineralogical Society of Southern California, Vol. 76 No. April 2006; Robert M. Housley (2005) Recent rare mineral finds in southern California and Nevada desert mines. Abstracts from the 2005 Desert Symposium. California State University, Desert Studies Consortium and LSA Associates, Inc.
Manganite
Formula: Mn3+O(OH)
Reference: USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10189217.
Mimetite
Formula: Pb5(AsO4)3Cl
Reference: Bulletin of the Mineralogical Society of Southern California, Vol. 76 No. April 2006; Robert M. Housley (2005) Recent rare mineral finds in southern California and Nevada desert mines. Abstracts from the 2005 Desert Symposium. California State University, Desert Studies Consortium and LSA Associates, Inc.; Robert E.Walstrom Collection
Opal
Formula: SiO2 · nH2O
Reference: Robert E.Walstrom Collection
Opal var: Hyalite
Formula: SiO2 · nH2O
Reference: Robert E.Walstrom Collection
Perite
Formula: PbBiClO2
Reference: Bulletin of the Mineralogical Society of Southern California, Vol. 76 No. April 2006; Robert M. Housley (2005) Recent rare mineral finds in southern California and Nevada desert mines. Abstracts from the 2005 Desert Symposium. California State University, Desert Studies Consortium and LSA Associates, Inc.
Pyrite
Formula: FeS2
Reference: USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10189217.
Quartz
Formula: SiO2
Reference: USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10310696.; Robert E.Walstrom Collection
Sphalerite
Formula: ZnS
Reference: USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10310696.
Wulfenite
Formula: Pb(MoO4)
Reference: Bulletin of the Mineralogical Society of Southern California, Vol. 76 No. April 2006; Robert M. Housley (2005) Recent rare mineral finds in southern California and Nevada desert mines. Abstracts from the 2005 Desert Symposium. California State University, Desert Studies Consortium and LSA Associates, Inc.; Robert E.Walstrom Collection

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
Gold1.AA.05Au
Group 2 - Sulphides and Sulfosalts
Chalcocite2.BA.05Cu2S
Chalcopyrite2.CB.10aCuFeS2
Covellite2.CA.05aCuS
Galena2.CD.10PbS
Pyrite2.EB.05aFeS2
Sphalerite2.CB.05aZnS
Group 3 - Halides
Chlorargyrite3.AA.15AgCl
var: Iodian Bromian Chlorargyrite3.AA.15Ag(Cl,Br,I)
Perite3.DC.30PbBiClO2
Group 4 - Oxides and Hydroxides
Goethite4.00.α-Fe3+O(OH)
Hematite4.CB.05Fe2O3
var: Specularite4.CB.05Fe2O3
Manganite4.FD.15Mn3+O(OH)
Opal4.DA.10SiO2 · nH2O
var: Hyalite4.DA.10SiO2 · nH2O
Quartz4.DA.05SiO2
Group 5 - Nitrates and Carbonates
Azurite5.BA.05Cu3(CO3)2(OH)2
Calcite5.AB.05CaCO3
Cerussite5.AB.15PbCO3
Malachite5.BA.10Cu2(CO3)(OH)2
Group 6 - Borates
Inyoite6.CA.35Ca(H4B3O7)(OH) · 4H2O
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
Baryte7.AD.35BaSO4
Wulfenite7.GA.05Pb(MoO4)
Group 8 - Phosphates, Arsenates and Vanadates
Conichalcite8.BH.35CaCu(AsO4)(OH)
Descloizite8.BH.40PbZn(VO4)(OH)
Duftite8.BH.35PbCu(AsO4)(OH)
Hedyphane8.BN.05Ca2Pb3(AsO4)3Cl
Mimetite8.BN.05Pb5(AsO4)3Cl
Group 9 - Silicates
Chrysocolla9.ED.20Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O

List of minerals arranged by Dana 8th Edition classification

Group 1 - NATIVE ELEMENTS AND ALLOYS
Metals, other than the Platinum Group
Gold1.1.1.1Au
Group 2 - SULFIDES
AmBnXp, with (m+n):p = 2:1
Chalcocite2.4.7.1Cu2S
AmXp, with m:p = 1:1
Covellite2.8.12.1CuS
Galena2.8.1.1PbS
Sphalerite2.8.2.1ZnS
AmBnXp, with (m+n):p = 1:1
Chalcopyrite2.9.1.1CuFeS2
AmBnXp, with (m+n):p = 1:2
Pyrite2.12.1.1FeS2
Group 4 - SIMPLE OXIDES
A2X3
Hematite4.3.1.2Fe2O3
Group 6 - HYDROXIDES AND OXIDES CONTAINING HYDROXYL
XO(OH)
Goethite6.1.1.2α-Fe3+O(OH)
Manganite6.1.3.1Mn3+O(OH)
Group 9 - NORMAL HALIDES
AX
Chlorargyrite9.1.4.1AgCl
Group 10 - OXYHALIDES AND HYDROXYHALIDES
A(O,OH)Xq
Perite10.2.5.1PbBiClO2
Group 14 - ANHYDROUS NORMAL CARBONATES
A(XO3)
Calcite14.1.1.1CaCO3
Cerussite14.1.3.4PbCO3
Group 16a - ANHYDROUS CARBONATES CONTAINING HYDROXYL OR HALOGEN
Azurite16a.2.1.1Cu3(CO3)2(OH)2
Malachite16a.3.1.1Cu2(CO3)(OH)2
Group 26 - HYDRATED BORATES CONTAINING HYDROXYL OR HALOGEN
Triborates
Inyoite26.3.1.1Ca(H4B3O7)(OH) · 4H2O
Group 28 - ANHYDROUS ACID AND NORMAL SULFATES
AXO4
Baryte28.3.1.1BaSO4
Group 41 - ANHYDROUS PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
(AB)2(XO4)Zq
Conichalcite41.5.1.2CaCu(AsO4)(OH)
Descloizite41.5.2.1PbZn(VO4)(OH)
Duftite41.5.1.4PbCu(AsO4)(OH)
A5(XO4)3Zq
Hedyphane41.8.2.1Ca2Pb3(AsO4)3Cl
Mimetite41.8.4.2Pb5(AsO4)3Cl
Group 48 - ANHYDROUS MOLYBDATES AND TUNGSTATES
AXO4
Wulfenite48.1.3.1Pb(MoO4)
Group 74 - PHYLLOSILICATES Modulated Layers
Modulated Layers with joined strips
Chrysocolla74.3.2.1Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2
Si Tetrahedral Frameworks - SiO2 with H2O and organics
Opal75.2.1.1SiO2 · nH2O
Unclassified Minerals, Mixtures, etc.
Chlorargyrite
var: Iodian Bromian Chlorargyrite
-Ag(Cl,Br,I)
Hematite
var: Specularite
-Fe2O3
Opal
var: Hyalite
-SiO2 · nH2O

List of minerals for each chemical element

HHydrogen
H ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
H ConichalciteCaCu(AsO4)(OH)
H DuftitePbCu(AsO4)(OH)
H Goethiteα-Fe3+O(OH)
H MalachiteCu2(CO3)(OH)2
H AzuriteCu3(CO3)2(OH)2
H InyoiteCa(H4B3O7)(OH) · 4H2O
H ManganiteMn3+O(OH)
H DescloizitePbZn(VO4)(OH)
H OpalSiO2 · nH2O
H Opal (var: Hyalite)SiO2 · nH2O
BBoron
B InyoiteCa(H4B3O7)(OH) · 4H2O
CCarbon
C CalciteCaCO3
C CerussitePbCO3
C MalachiteCu2(CO3)(OH)2
C AzuriteCu3(CO3)2(OH)2
OOxygen
O BaryteBaSO4
O CalciteCaCO3
O CerussitePbCO3
O ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
O ConichalciteCaCu(AsO4)(OH)
O DuftitePbCu(AsO4)(OH)
O Goethiteα-Fe3+O(OH)
O HedyphaneCa2Pb3(AsO4)3Cl
O HematiteFe2O3
O MalachiteCu2(CO3)(OH)2
O MimetitePb5(AsO4)3Cl
O PeritePbBiClO2
O WulfenitePb(MoO4)
O AzuriteCu3(CO3)2(OH)2
O QuartzSiO2
O Hematite (var: Specularite)Fe2O3
O InyoiteCa(H4B3O7)(OH) · 4H2O
O ManganiteMn3+O(OH)
O DescloizitePbZn(VO4)(OH)
O OpalSiO2 · nH2O
O Opal (var: Hyalite)SiO2 · nH2O
AlAluminium
Al ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
SiSilicon
Si ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
Si QuartzSiO2
Si OpalSiO2 · nH2O
Si Opal (var: Hyalite)SiO2 · nH2O
SSulfur
S GalenaPbS
S ChalcopyriteCuFeS2
S BaryteBaSO4
S CovelliteCuS
S ChalcociteCu2S
S SphaleriteZnS
S PyriteFeS2
ClChlorine
Cl HedyphaneCa2Pb3(AsO4)3Cl
Cl MimetitePb5(AsO4)3Cl
Cl PeritePbBiClO2
Cl Chlorargyrite (var: Iodian Bromian Chlorargyrite)Ag(Cl,Br,I)
Cl ChlorargyriteAgCl
CaCalcium
Ca CalciteCaCO3
Ca ConichalciteCaCu(AsO4)(OH)
Ca HedyphaneCa2Pb3(AsO4)3Cl
Ca InyoiteCa(H4B3O7)(OH) · 4H2O
VVanadium
V DescloizitePbZn(VO4)(OH)
MnManganese
Mn ManganiteMn3+O(OH)
FeIron
Fe ChalcopyriteCuFeS2
Fe Goethiteα-Fe3+O(OH)
Fe HematiteFe2O3
Fe Hematite (var: Specularite)Fe2O3
Fe PyriteFeS2
CuCopper
Cu ChalcopyriteCuFeS2
Cu ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
Cu ConichalciteCaCu(AsO4)(OH)
Cu DuftitePbCu(AsO4)(OH)
Cu MalachiteCu2(CO3)(OH)2
Cu CovelliteCuS
Cu ChalcociteCu2S
Cu AzuriteCu3(CO3)2(OH)2
ZnZinc
Zn SphaleriteZnS
Zn DescloizitePbZn(VO4)(OH)
AsArsenic
As ConichalciteCaCu(AsO4)(OH)
As DuftitePbCu(AsO4)(OH)
As HedyphaneCa2Pb3(AsO4)3Cl
As MimetitePb5(AsO4)3Cl
BrBromine
Br Chlorargyrite (var: Iodian Bromian Chlorargyrite)Ag(Cl,Br,I)
MoMolybdenum
Mo WulfenitePb(MoO4)
AgSilver
Ag Chlorargyrite (var: Iodian Bromian Chlorargyrite)Ag(Cl,Br,I)
Ag ChlorargyriteAgCl
IIodine
I Chlorargyrite (var: Iodian Bromian Chlorargyrite)Ag(Cl,Br,I)
BaBarium
Ba BaryteBaSO4
AuGold
Au GoldAu
PbLead
Pb GalenaPbS
Pb CerussitePbCO3
Pb DuftitePbCu(AsO4)(OH)
Pb HedyphaneCa2Pb3(AsO4)3Cl
Pb MimetitePb5(AsO4)3Cl
Pb PeritePbBiClO2
Pb WulfenitePb(MoO4)
Pb DescloizitePbZn(VO4)(OH)
BiBismuth
Bi PeritePbBiClO2

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Cloudman, H.C. (1913): Pacific Mines Corporation, formerly Bagdad Chase & Roosevelt Consolidation: California State Mining Bureau Field Report 111; California Geological Survey (formerly California Division of Mines and Geology) Minefile Folder No. 322-5555.
Tucker, W. B. (1917), Pacific Mines Company, formerly Bagdad, Chase, and Roosevelt Mines: California State Mining Bureau Field Report Supplement 111; CGS (formerly CDMG) Minefile Folder No. 322-5555.
Cloudman, H.C., F.J.H. Merrill & E. Huguenin (1919), San Bernardino County: California Mining Bureau. Report 15: 774-899; […(abstract): Geol. Zentralbl., Band 27: 394].
Tucker, W. Burling (1921), Los Angeles field division: California Mining Bureau. Report 17: 333-374.
Tucker, W.Burling (1923), Los Angeles Field Division, San Bernardino County California, Mining Bureau Report 19: 165-173.
Tucker, W. Burling & Reid J. Sampson (1930), Los Angeles field division: San Bernardino County, California Mining Bureau. Report 26: 202-325.
Tucker, W. Burling & Reid J. Sampson (1931), Los Angeles Field Division; 27th Report of the State Mineralogist; San Bernardino County: California Mining Bureau. Report 27: 262-401.
Royer, F. W. (1934), Mining Engineer, Report on ore shipments from the Bagdad Chase property from 1910 to 1916 in Tucker, W. B., 1934: State Mining Bureau Field Report 111, May 20, 1934; CGS (formerly CDMG) Minefile Folder No. 322-5555.
Tucker, W. B. (1934a), Bagdad Chase & Roosevelt Mines: California State Mining Bureau Field Report #111, revised; CGS (formerly CDMG) Minefile Folder No. 322-5555.
Tucker, W. B. (1934b), Bagdad-Chase Mine tailings: California State Mining Bureau Field Report #37; CGS (formerly CDMG) Minefile Folder No. 322-5555.
Tucker, W. Burling (1934), Current Mining Activity in Southern California; San Bernardino County: California Journal of Mines and Geology, California Division of Mines (Report 30): 30(4): 323-326.
Gardner, Dion Lowell (1940), Geology of the Newberry and Ord Mountains, San Bernardino County, California: California Division Mines Report 36: 257-292.
Tucker, W. Burling & Reid J. Sampson (1940), Current mining activity in southern California: California Division Mines Report 36: 29.
Tucker, W. Burling & Reid J. Sampson (1940a), Economic mineral deposits of the Newberry and Ord Mountains, San Bernardino County: California Division Mines Report 36(3): 232-233.
Tucker, W. Burling & Reid J. Sampson (1943b), Mineral resources of San Bernardino County: California Division Mines Report 39: 427-550.
Eric, J.C. (1948), Tabulation of Copper Deposits in California in: Copper in California: California Division of Mines Bull. 144: 199-357.
Stewart, R. M. (1951), Preliminary Report No. 30, San Bernardino County, April 1951, 2 p.; CGS (formerly CDMG) Minefile Folder No. 322-5555.
Belden, L. B. (1952), as reported in an article in the San Bernardino Sun-Telegram: Bagdad Chase was discovered in 1899 by John Suter; cited in the California Mining Journal, November 1987, p. 4.
Wright, L.A., et al (1953), Mines and mineral resources of San Bernardino County, California: California Journal of Mines and Geology: 49(1-2): 71-73.
Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 144.
Polovina, J. S. (1980), Mineralized hydrothermal breccias in the Stedman district, San Bernardino County, California, in Fife, D. L. and Brown, A. R., Editors, Geology and Mineral Wealth of the California Desert: South Coast Geological Society; Santa Ana, California, p. 314-317.
Polovina, J. S. (1980b), The geology and mineral deposits of the and vicinity, Stedman district, San Bernardino County, California [MS Thesis], University of California, Los Angeles, 125 pp.
Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 514.
Polovina, J. S. (1984), Origin and structural evolution of gold-silver-copper bearing hydrothermal breccias in the Stedman mining district, southeastern California, in Wilkins, Joe, Jr., Gold and silver deposits of the Basin and Range province, western U.S. A.: Arizona Geological Society Digest, Vol. XV, Tucson, Arizona: 159-165.
Dokka, R. K. (1986), Patterns and modes of early Miocene crustal extension, central Mojave Desert, California, in Mayer, Larry, Editor, Extensional Tectonics of the Southwestern United States: A Perspective on Processes and Kinematics: Geological Society of America Special Paper 208: 75-95.
California Mining Journal (1987), Old Bagdad Chase gold mine, gearing up for new production: California Mining Journal: 57(3): 3-4.
London Mining Journal (1987), Bentley Expands Bagdad Holdings. (April 17, 1987): 292.
Polovina, J. S. (1987), Origin and structural evolution of gold-silver-copper bearing hydrothermal breccias in the Stedman mining district, southeastern California in Bulk mineable precious metal deposits of the western United States, Guidebook for field trips, April 6-8, 1987: 45-51.
Randol Mining Directory (1990).
Walker, J. D., Bartley, J. M., Glazner, A. F. (1990), Large-magnitude Miocene extension in the central Mojave Desert: implications for Paleozoic to Tertiary paleogeography and tectonics: Journal of Geophysical Research: 95(B1): 557-569.
Long, K. R. (1992), Descriptive model for detachment-fault-related polymetallic deposits, in Bliss, J. D., ed., Developments in mineral deposit models: USGS Bulletin 2004, p. 52-58.
Tosdal, R. M., Rytuba, J. J., Theodore, T. G., Ludington, S. L., Jachens, R. C., Miller, R. J., Keith, W. J. (1992), Evaluation of selected metallic and nonmetallic mineral resources, West Mojave Management Area, southern California: USGS Open-File Report 92-595, 89 pp.
Dokka, R. K., Ross, T. M., and Lu, G. (1998), The trans Mojave-Sierran shear zone and its role in Early Miocene collapse of southwestern North America, in Holdsworth, B., Dewey, J., and Strachan, R., Eds., Continental Transpressional and Transtensional Tectonics: Geological Society of London Special Publication 135: 183-202.
Feller, Walter (2002), Stedman: Mojave Desert Ghost Town Books: http://digital_desert.com/stedman/.
Glazner, A. F., Walker, J. D., Bartley, J. M., and Fletcher, J. M. (2002), Cenozoic evolution of the Mojave block of southern California: Geological Society of America Memoir 195: 19-41.
Sheth, H. C., Torres-Alvarado, I.S., and Verma, S.P. (2002), What is the "Calc-alkaline rock series"?: International Geology Review: 44(8)(1 August 2002): 686-701.
Gans, Philip, DeVecchio, D., Singleshort ton, J., Van Pelt, J., Wong, M., and Reynolds, J. (2005), Cenozoic magmatic and structural evolution of the central Mojave Desert, California: new constraints from 40Ar/39Ar geochronology and thermochronology: Geological Society of America, Cordilleran Section 101st Annual Meeting, April 29-May 1, 2005, Paper No. 44-10.
Mansfield, Ross (2005): Off Road touring in the Buckeye mining district; Ludlow, Ragtown, Stedman and the Ludlow & Southern Railway: http://www.off-road.com/dirtbike/features/2005/ludlow_stedman/
USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10034008, 10189217 & 10310696.
Bagdad Chase Inc. (2006), 10-K 1999 Annual Report: http://www.getfilings.com/o0000009128-00-000001.html.
Bulletin of the Mineralogical Society of Southern California (2006): 76 (April).
Ross, D. G. (2006), The Bagdad Chase Mine: www.ttrr.org/ls_text/lspb_002.html.
U.S. Bureau of Mines, Minerals Availability System (MAS) file #006071
California Geological Survey, Portions of various unpublished reports, and information from various Internet websites, contained in California Geological Survey (formerly California Division of Mines and Geology) Minefile Folder No. 322-5555.
London Mining Journal. Bentley Expands Bagdad Holdings. April 17, 1987: 292.
Northern Miner, April 11, 1988: NM on-line archives.
Northern Miner, February 29, 1988: NM on-line archives.
Northern Miner, July 25, 1988: NM on-line archives.
Northern Miner, June 15, 1987: NM on-line archives.
The Gold Ledge, p. 3 of 6: www.goldledge.com/history/docs_html/metals_san_bernardino.html

Other Databases

USGS MRDS Record:10034008

External Links


Other Regions, Features and Areas containing this locality

North America PlateTectonic Plate

This page contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.
 
矿物 and/or 产地  
版权所有© mindat.org1993年至2020年,除了规定的地方。 Mindat.org全赖于全球数千个以上成员和支持者们的参与。
隐私政策 - 条款和条款细则 - 联络我们 Current server date and time: 2020.2.17 12:25:07 Page generated: 2019.12.30 03:26:17
Go to top of page