 | | Report (issue) | | metal-bearing, epithermal deposits of Mexico and Peru by Nora K. Foley Open File Report 84-633 This...districts Guanajuato District, Guanajuato, Mexico References Geologic map of Guanojuato District, Mexico Pachuca-Real...del Monte District, Hidalgo, Mexico References Geologic map of Pachuca-Real del Monte District, Mexico...Colqui District, Lima, Peru References Geologic map of Colqui District, Peru Julcani District, Huancavelica...Huancavelica, Peru References Geologic map of Julcani District, Peru 1 2 3 4 4 10 11 12 16 18 19 24 25 26 |  | | Report (issue) | | INTERIOR GEOLOGICAL SURVEY Diverse origins of alunite and acid-sulfate alteration: stable isotope systematics...wallrock alteration, characterized by the assemblage alunite+kaolinite+ quartz± pyrite, results from base-leaching...andesitic volcanic terrains. In addition, vein alunite without substantial acid-sulfate alteration can...diagenetic environment. Detailed stable isotope data on alunite and associated kaolinite and pyrite are powerful...determining the environment of formation. Analyses of alunite from over 20 mining districts and geothermal fields |  | | Report (issue) | | geochemistry of acid-sulfate alteration and vein forming alunite by Robert O. Rye 1 Philip M. Bethke2 Michael D...wall-rock alteration, characterized by the assemblage alunite+kaolinite+ quartz±pyrite, results from base-leaching...andesitic volcanic terrains. In addition, coarse vein alunite may form in a magmatic-steam environment from rapid...oxygen in the carapace of a volcanic edifice. Alunite [KAh(SO4)2(OH)fil contains four stable isotope...measurements have been made on nearly 200 samples of alunite and associated minerals from 20 localities and |  | | Journal (article/letter/editorial) | | porphyry-type deposits, (4) magmatic-hydrothermal alunite and closely related barites in high-sulfidation...deposits, (5) coarse-banded alunite in magmatic-steam systems, (6) alunite and jarosite in steam-heated...waters. Hydrogen isotopic equilibrium between alunite and water and jarosite and water is always initially...interpretation of yD values of magmatichydrothermal alunite in high-sulfidation gold deposits because later...hydrogen– isotope exchange in the OH site of the alunite. This retrograde exchange also affects the reliability |  | | Journal (issue) | | TSKnerals of i'eru ! Indian miner, Cerro de Pasco, Peru, 1869 (Simonin, 1869). J3E(mes and J3E(merals... 7 cm, from the Huanzala mine, Dos de Mayo Province, Peru. Marty Zinn collection; Jeff Scovil photo................................ History of Peru Mining in Peru The Mineral Specimen Business C o l l e c....................... Quiruvilca district, Santiago de Chuco province, department of La Libertad PASTO.......................... Pasto Bueno district, Pallasca province, department of Ancash R a u r a -H u |  | | Report (issue) | | deduction of 0.97% insol. and 0.56% pyrite. (2) Huaron, Peru; by electron microprobe. (3) Cu3 AsS4 . Polymorphism...bismuthinite, silver sulfosalts, silver, gold, marcasite, alunite, barite, quartz. Distribution: From the Lepanto...La Rioja Province, Argentina. In the Julcani district, at Cerro de Pasco, and at Huaron, Peru. In the...Chariot mine, Jamestown district, Nye Co., and in the Burrus vein, Pyramid district, Washoe Co.; from Butte |  | | Report (issue) | | uppermost ore zones of all vein systems in the district. SLIDE LEFT 3 - Photo, late-stage Creede botryoidal...accessory minerals, can be correlated throughout the district (Plumlee and Rye, 1986). In order to interpret...been encountered in drill core in the northern district (samples for analysis provided by Homestake Mining...late-stage plumose marcasite, botryoidal pyrite, and alunite. Barite and chalcedony have also been noted as...plumose marcasite in the sample on the left is alunite, happily compatible with a late-stage oxidizing |  | | Journal (article/letter/editorial) | | Polymetallic Veins of the Castrovirreyna District, Central Peru: Fault Growth and Mineralization in a Perturbed...undulatory silver veins of the Castrovirreyna district, central Peru, formed in a dilatant, anastamosing, low-displacement...Creede district, Colorado (Stevens and Eaton, 1975); the No Conocida vein of the Colorada district, Mexico...curved (Albinson, 1988); and veins of the Fresnillo district, Mexico, are wavy in map view (Gemmell et al....undulating veins of the Castrovirreyna district of central Peru (Fig. 1) have geometric configurations |  | | Journal (article/letter/editorial) | | POTASSIUMAND RUBIDIUM METASOMATISM AT THE ]ULCANI DISTRICT, PERU DARYL A. SCHERKENBACH NorandaExploration...determined and rubidium metasomatism on both a district-wide scaleandat closeproximityto veinsandveinsystems...hydrothermalalterationand mineralization(Scherkenbach,1978). The Julcani Mineralogy and Chemical Changes districtis well...fine-grainedor glassy Most of the altered rocksin the district thedetermination of accurate background values...additionalunaltered samples northwestparts of the district (700-935 ppm). This were used to establishbackgroundvalues |  | | Journal (article/letter/editorial) | | Geological and Hydrothermal Processes, Northern Peru a b Andrew W. Macfarlane , Rosa-Maria Prol-Ledesma...Geological and Hydrothermal Processes, Northern Peru, International Geology Review, 36:7, 645-677, DOI:...Geological and Hydrothermal Processes, Northern Peru A N D R E W W. MACFARLANE, Department of Geology...Abstract Mineralization in the Hualgayoc district of northern Peru occurs in altered Miocene felsic intrusions...rock-hosted base-metal veins. Igneous rocks in the district are affected by propylytic, sericitic-argillic |  | | Report (issue) | | above types of geochemical information: Colqui, Peru; Comstock, Nevada; Creede, Colorado; Goldfield,...Nevada; Guanajuato, Mexico; Lake City, Colorado; Julcani, Peru; Oatman, Nevada; Pachuca-Real Del Monte, Mexico;...Round Mountain, Nevada; Sunnyside mine, Eureka district, Colorado; Summitvilie, Colorado; and Tonopah...were found for the Silver City - De Lamar, Idaho district. The purpose of this report is to make this compilation...Only a few data are reported for Lake City and Julcani, while at Creede approximately 200 analyses have |  | | Journal (article/letter/editorial) | | phasesare depositedprogressively farther from the district center (Stoces,1934; Park, 1955; Barnes, Base...Assemblages deposits, such as Quiruvilca and Julcani, suggest a Pasco,Peru, hasproducedmorethan 66 millionmettemporal...-t- sericite tivity away from the center of the district (Petersen, Einaudi, 1982). and/oradvancedargi...metal lodes such as Butte or Moro-t- pyrite _ alunite) in quartzofeldspathic wall rock, andby silica-t-pyrite...changein fluid chemistry(GratonandBowditch, 1936). At Julcani,advancedargillicalteration preceded vein-fill deposition(Deenet |  | | Journal (article/letter/editorial) | | mineral assemblages: advanced argillic alteration (alunite-pyrophyllite-kaolinite-pyrite); sericitic alteration...(quartz-chlorite-carbonate-pyrite); and silicified zones. Alunite in the advanced argillic zone occurred in two types;...<20–30 m. Alunite grain size is greater in the central part of disseminated or massive alunite, while it...during the alunite formation. Isotopic data, geological setting, mineralogy, size of alunite and pure alunite...alunite composition (K end member) indicate that alunites of the study area were formed in the steam-heated |  | | Report (issue) | | , 72 p. Ashley, R. P., 1974, Goldfield mining district, jLn Guidebook to the geology of four Tertiary...metals in silicified rocks of the Goldfield mining district, Nevada: U.S. Geological Survey Professional Paper...Paul, 1945, Quicksilver deposits of the Knoxville district, Napa, Yolo, and Lake Counties, California: California...Environment of ore deposition in the Creede mining district, San Juan Mountains, Colorado: Part III: Progress...Trail Pb-Zn-Ag-AuCu manto deposits, Marysvale district, west-central Utah: Economic Geology (in press) |  | Fornadel, Andrew P., Voudouris, Panagiotis Ch., Spry, Paul G., Melfos, Vasilios (2012) Mineralogical, stable isotope, and fluid inclusion studies of spatially related porphyry Cu and epithermal Au-Te mineralization, Fakos Peninsula, Limnos Island, Greece. Mineralogy and Petrology, 105 (1) 85-111 doi:10.1007/s00710-012-0196-8 | Journal (article/letter/editorial) | | porphyry mineralization by >1 Ma (e.g., Colquijirca district, Bendezu et al. 2003). Post-orogenic extension...Alpine-Balkan-CarpathianDinaride metallogenetic and geodynamic province (Heinrich and Neubauer 2002; Marchev et al. 2005)...pyrite, marcasite, minor alunite, ziron, anatase) Advanced argillic (alunite, quartz, kaolinite, pyrite)...“cervelleite”, native Au, Au-Ag alloy, Advanced argillic (alunite, quartz, kaolinite, pyrite) Sericitic (sericite...by alunite, quartz, kaolinite, and pyrite (Fig. 4l, m). In places, ≤300 μm long acicular alunite replaced |  | | Journal (article/letter/editorial) | | Massachusetts 02138 Abstract The centralAndeanCordilleraof Peru,Bolivia,northwestern Argentina,andnorthernChile...northernandcentralChile; subprovince Ib, in central Peru north of 13ø S; and subprovinceIc, in southernPeru...that dominates the geologyof the high Andesof Peru. Province III: The Eastern Cordillera of southeasternPeru...northernArgentina,and subprovince IIIb in southeastern Peru. Theseprovincesare borderedby noncordilleranunitsof...stronglyperaluminous characterof muchof the magmatism in province III. Detailed comparisons of lead isotopedata |  | | Report (volume) | | by Hydrothermaf Alteration at the Red MouQtaio Alunite., Deposit, Lake City, Colorado AVAILABILITY OF...by Hydrothermal Alteration at the Red Mountain Alunite Deposit, Lake City, Colorado By DANA J. BOVE...by hydrothermal alteration at the Red Mountain alunite deposit, Lake City, Colorado I by Dana J. Bove...Hydrothermal alteration-Colorado-Lake City Region. 2. Alunite-Colorado-Lake City Region. 3. GeochemistryColorado-Lake...calculations on data Discussion of results 13 Alunite alteration zone 14 Argillic alteration assemblage |  | | Book | | tennantite on octahedral pyrite from Quiruvilca. Peru 4: 159-163 --with R. W. Thomssen: Lithiophilite...Rybicki) 7:72-77 Chalcanthite from the Helvetia district, Arizona (by G. Robinson) 9:252 Cuprite [from...Arizona (by W. A. Thompson) 11:248-250 The Tombstone district, Cochise County, Arizona (by S. A. Williams) 11:251-257... A. Scovil) 21:99-100 Arizona's Silver mining district (by P. Bancroft & G. Bricker) 21:151-168 The Fat...24:67 Famous mineral local.ities: the Rush Creek district, Marion County, Arkansas (by D. A. Richards) 24:285-299 |  | | Journal (article/letter/editorial) | | IN A ZONED CORDILLERAN BASE METAL DISTRICT, MOROCOCHA, CENTRAL PERU Honza CATCHPOLE§ Earth and Environmental...polymetallic mineralization in the Morococha district, central Peru, displays a deposit-scale base metal zonation...evolving hydrothermal fluid by the host rock on a district-scale. Keywords: base metal zonation, Morococha...Bendezú et al. 2008a). In the Morococha district, central Peru, Cordilleran polymetallic mineralization...2008), Casapalca, Peru (McKinstry & Noble 1932, Rye & Sawkins 1974), and Colqui, Peru (Kamilli & Ohmoto |  | | Report (volume) | | east-west, northwest, and northeast within the district. Hawkins (1982) postulated that the east-west...upper- and lower-plate rocks in the Jerritt Canyon district is thought to be a high-angle fault. Exposure...cover in the district. REGIONAL STRATIGRAPHY Most of the rocks in the Jerritt Canyon district are Paleozoic...geologic map of the Enfield Bell mine, Jerritt Canyon district, Elko County, Nevada. � Geology of the Enfield...Enfield Bell Mine and the Jerritt Canyon District, Elko County, Nevada 97 Lower-plate rocks Lower-plate stratigraphy |  | | Report (issue) | | inclusions from topaz-quartzrocks from the ew England district of cw South Wales in Australia. Many of the Ml...mdallogeoicprovinces,such as the southwestem U.S. porphyrycopper province,were controlled by a bcterogcncous distributionof...inclusions in the porphyrycopperdeposit at La Granja. Peru. Chem.Geol. 61, 183-192. JOHN, D.A. (1989): Geologic... R.J Bodnar and Minera/i;atio11 in the Bulle District,Mo111a11a Ph.D. thesis, Harvard Univ. Cambridge...Furthermore, fnlcJackson et al. I989). Throughout the province, tionation among individual pegmalite bodies igneous |  | | Book | | ............... . 83 The Fresnillo Ag-Pb-Zn District, Zacatecas, Mexico ................................. . 2.2.2 The Casapalca Ag-Pb-Zn-Cu Deposit, Peru . 84 88 2.3 Epithermal Vein Deposits ................... . 91 2.3.1 The lulcani Deposit, Peru ............... . 2.3.2 Discussion and Suggestions for...Massive Sulfide Deposits of the BathurstNewcastle District, New Brunswick, Canada Discussion of Tectonic...conditions are typified by the Andean arc system of Peru and Chile, although in detail the dominant compression |  | | Book | | MALAWI Mount Malosa, Chilwa alkaline province, Zomba district. "Illite" is the name of a series of incompletely...Administered Tribal Areas and North West Frontier Province. Ilmenite crystal clusters to 12 cm across have...of rutile (Weerth, 2004). Tonniq Valley, Skardu district, Gilgit-Baltistan [Northern Areas]. Beginning...hematite. Zagi [Zegi] Mountain, Warsak district, North West Frontier Province. Surface diggings worked by local...to 6 cm (2005: 120). Los Remedios mine, Taxco district, Taxco, Guerrero. Ilvaite occurs in the wallrock |  | | Book | | average 3.5 ppb gold with little variation in anyone province (3.7, 3.8 and 3.1 ppb respectively). In comparison...mafic syenite; Montana, US 2.85 1.9 Trans-Pecos province; syenogabbro, syenite, granite; Texas, US 0.74...intrusives, W. Australia 2.2 2.85 50 Superior Province craton, Canada Abitibi subprovince, Ontario localities...2 1.1 0.3-7.8 Tonalite, granodiorite Superior Province craton, Canada W.Wabigoon subprovince; Kakagi...Czechoslovakia 4.6 Tuffaceous siltstone; Superior Province (Archaean), Canada 1.1 1.95 Shales, argillite |  | | Book (edition) | | Colorado at the Pelican Dives mine, Silver Plume district, and at the Little Emma mine, Clear Creek County;...lode, Summit County, and in the Cripple Creek district. It is also found in Canada; Mexico; Bolivia;...California; in sodalite-syenite in the Julianehaab district, Greenland; in the liparite lavas of the island...slate and metamorphosed dolomite in the Beiyun-Obo district, Inner Mongolia, China, associated with aegirine...Antrim County, Ireland; and in the Laacher See District, West Germany. SELECTED REFERENCE: Switzer, G |
|
