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

Alaska-Juneau; A-J; AJ Mine, Juneau District, Juneau Borough, Alaska, USA

This page is currently not sponsored. Click here to sponsor this page.
Key
Lock Map
Latitude & Longitude (WGS84): 58° 18' 28'' North , 134° 20' 38'' West
Latitude & Longitude (decimal): 58.30778,-134.34389
GeoHash:G#: c427wytg2
Locality type:Mine
Köppen climate type:Dfc : Subarctic climate


Location: The Alaska-Juneau Mine is at an elevation of 1,000 feet, on the southwest side of Silverbow Basin, 2.5 miles east-southeast of Mt. Juneau and 1 mile north of Gastineau Peak. It is near the northeast corner of section 19, T. 41 S., R. 68 E. of the Copper River Meridian. The location is accurate. References to the Alaska-Juneau Mine commonly include the Ebner Mine (JU149), the Groundhog Mine (JU169), and the Perseverance Mine (JU168).
Geology: The Alaska-Juneau Mine (AJ, A-J), was discovered by Joe Juneau and Richard Harris in 1880 and comprises four separate ore bodies: the Ebner ore body (JU149); the North and South orebodies; and the Perseverance orebody (JU168). The mine operated from 1883 to 1944, when labor shortages and rising prices forced the mine to stop operations. The total production from the Alaska-Juneau Mine is approximately 3.5 million ounces of gold, 1.9 million ounces of silver, and 40.2 million pounds of lead (Redman and others, 1989). Of that total, the Alaska-Juneau North and South orebodies account for over 88 million tons of ore that produced 2.8 million ounces of gold and nearly 1.9 million ounces of silver; the Perseverance Mine (JU168) accounts for over 500,000 ounces of gold and over 480,000 ounces of silver; while the Ebner Mine (JU149) accounts for over 50,000 ounces of gold. The deposit was mined by modified block-caving and hand-sorting. There are 93.7 miles of underground workings on 15 levels that extend from 1000 feet below sea level to 2,800 feet above sea level. When combined with the Perseverance Mine, the total amount of underground workings is nearly 120 miles. From 1986 to 1988, Echo Bay Mines renovated the Sheep Creek Tunnel (JU177), completed a 2,000 foot decline to the AJ 4 level, and drove 1,100 feet of new workings in the Perseverance Mine (Redman and others, 1989). Approximately 360,000 feet of underground and surface core drilling was completed by Echo Bay Mines between 1986 and 1997. Using a sublevel caving mining model, Echo Bay Mines Ltd. calculated an indicated and inferred resource for the Alaska-Juneau Mine of 89 million tons with an average grade of 0.05 ounce of gold per ton (L. Miller, personal comm., 2001). The Alaska-Juneau deposit is a system of sulfide-bearing, auriferous, quartz-ankerite veins in the structurally lowest portion of the Perseverance Slate, an Upper Triassic unit of carbonaceous and graphitic, quartz-sericite phyllite, schist, and black slate, with minor carbonaceous limestone and numerous sill-like lenses of amphibolite or metagabbro (Miller and others, 1992; Light and others, 1989). The vein system is more than 6 kilometers in strike length, 700 meters in vertical extent, and is confined to the lowest 100 meters of the Perseverance Slate. The system comprises numerous veins, veinlets, stringers and stockworks; individual veins range from a few centimeters to over 1 meter thick. The veins are 95 percent quartz, with subordinate ankerite, pyrrhotite, galena, sphalerite, electrum, arsenopyrite, pyrite, and native gold. Approximately 90 percent of the gold is free-milling (Light and others, 1989; Twenhofel, 1952). The Alaska-Juneau Mine was one of the major gold producers in the Juneau Gold Belt. The belt consists of more than 200 mesothermal quartz-vein prospects and mines, which produced nearly 7 million ounces of gold (Miller and others, 1994). The structural grain of the belt is defined by a northwest-striking, moderately to steeply northeast-dipping, penetrative foliation that developed between Cretaceous and Eocene time (Miller and others, 1994).
Workings: The deposit at the Alaska-Juneau Mine (AJ, A-J), was discovered by Joe Juneau and Richard Harris in 1880 and comprises four separate ore bodies: the Ebner ore body (JU149); the North and South orebodies; and the Perseverance orebody (JU168). The mine operated from 1883 to 1944, when labor shortages and rising prices forced the mine to stop operations. There are 93.7 miles of underground workings on 15 levels that extend from 1000 feet below sea level to 2,800 feet above sea level. When combined with the Perseverance Mine, the total amount of underground workings is nearly 120 miles. During 1986-1988, Echo Bay Mines renovated the Sheep Creek Tunnel (JU177), completed a 2,000 foot decline to the AJ 4 level, and drove 1,100 feet of new workings in the Perseverance Mine (Redman and others, 1989). Approximately 360,000 feet of underground and surface core drilling was completed by Echo Bay Mines between 1986 and 1997.
Age: Isotopic dates indicate that the auriferous veins in the Juneau Gold Belt formed between 56 and 55 Ma (Miller and others, 1994; Goldfarb and others, 1997).
Alteration: Alternation consists of hydrothermal biotite, ferroan dolomite, and sericite; chlorite and albite partly replace amphibolite( Miller and others, 1992). The alteration has been traced with decreasing intensity as much as 1 kilometer from the Alaska-Juneau mine. Inward from its periphery, magnetite, then ilmenite and magnetite, are replaced by pyrrhotite (Miller and others, 1992; Newberry and Brew, 1987).
Production: The total production from the Alaska-Juneau Mine is approximately 3.5 million ounces of gold, 1.9 million ounces of silver and 40.2 million pounds of lead (Redman and others, 1989). Of that total, the Alaska-Juneau North and South orebodies account for over 88 million tons of ore that contained 2.8 million ounces of gold and nearly 1.9 million ounces of silver; the Perseverance Mine (JU168) accounts for over 500,000 ounces of gold and over 480,000 ounces of silver; while the Ebner Mine (JU149) accounts for over 50,000 ounces of gold production. The Alaska-Juneau deposit was mined by modified block-caving and hand-sorting.
Reserves: Using a sublevel-caving mining model, Echo Bay Mines Ltd. calculated an indicated and inferred resource for the Alaska Juneau mine of 89 million tons of material with an average grade of 0.05 ounce of gold per ton.

Commodities (Major) - Ag, Au, Pb; (Minor) - Cu, Zn
Development Status: Yes; large
Deposit Model: Low-sulfide Au-quartz vein (Cox and Singer, 1986; model 36a)


Commodity List

This is a list of exploitable or exploited mineral commodities recorded at this locality.


Mineral List


12 valid minerals.

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org

Paleozoic - Triassic
252.17 Ma



ID: 1706552
Metasedimentary and minor metavolcanic rocks along the west side of the Coast plutonic complex of Brew and Morrell (1979b)

Age: Early Triassic (252.17 Ma)

Description: MAINLAND BELT: METAMORPHIC ROCKS OF COAST PLUTONIC-METAMORPHIC COMPLEX: Dominantly well foliated and commonly lineated dark gray very fine to fine grained phyllite with minor thin dark gray semischist interlayers, weathers medium to dark gray; some extensive areas of interlayered green phyllite that weathers light green; the former are probably derived from a fine grained clastic section; the latter from either tuffs or fine grained volcanogenic sediments; metamorphic grade generally increases from prehnite pumpellyite/low greenschist facies in the southwest to upper greenschist facies in the northeast. Host rock for the A-J gold quartz stringer lode deposits.

Lithology: Metamorphic

Reference: Wilson, F.H., Hults, C.P., Mull, C.G, and Karl, S.M. (compilers). Geologic map of Alaska. doi: 10.3133/sim3340. U.S. Geological Survey Scientific Investigations Map 3340, pamphlet 196. [21]

Permian - Devonian
252.17 - 419.2 Ma



ID: 3187479
Paleozoic sedimentary rocks

Age: Paleozoic (252.17 - 419.2 Ma)

Lithology: Sedimentary rocks

Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. [154]

Data and map coding provided by Macrostrat.org, used under Creative Commons Attribution 4.0 License



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.

References

Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Gehrels, G.E., McClelland, W.C., Samson, S.D., and Patchett, P.J., 1991, U-Pb geochronology of detrital zircons from a continental margin assemblage in the northern Coast Mountains, southeastern Alaska: Canadian Journal of Earth Sciences, v. 28, no. 8, p.1285-1300. Goldfarb, R.J., Miller, L.D., Leach, D.L., and Snee, L.W, 1997, Gold deposits in metamorphic rocks in Alaska, in Goldfarb, R.J., and Miller, L.D., eds., Mineral Deposits of Alaska: Economic Geology Monograph 9, p. 151-190. Light, T.D., Brew, D.A., and Ashley, R.P., 1989, The Alaska-Juneau and Treadwell lode gold systems, southeastern Alaska, in DeWitt, E., Waegli, J., Light, T.D., Brew, D.A., and Ashley, R.P., eds., Gold deposits in metamorphic rocks, Part I: U.S. Geological Survey Bulletin 1857-D, p. D27-D36. Miller, L.D., Barton, C.C., Fredericksen, R.S., and Bressler, J.R., 1992, Structural evolution of the Alaska-Juneau lode gold deposit, southeastern Alaska: Canadian Journal of Earth Sciences, v. 29, p. 865-878. Miller, L.D., Goldfarb, R.J., Gehrels, G,E., and Snee, L.W., 1994, Genetic links among fluid cycling, vein formation, regional deformation, and plutonism in the Juneau gold belt, southeastern Alaska: Geology, v. 22, p. 203-206. Newberry, R.J., and Brew, D.A., 1987, The Alaska-Juneau gold deposit; remobilized syngenetic versus exotic epigenetic origin, 1987, in Hamilton, T.D., and Galloway, J.P., eds., Geologic studies in Alaska by the U.S. Geological Survey during 1986: U.S. Geological Survey Circular 998, p. 128-131. Redman, E.C., Maas, K.M., Kurtak, J.M., and Miller, L.D., 1989, Bureau of Mines Mineral Investigations in the Juneau Mining District, Alaska, 1984-1988, Volume 2--Detailed mine, prospect, and mineral occurrence descriptions, Section D, Juneau Gold Belt Subarea: U.S. Bureau of Mines Special Publication, 424 p. Spencer, A.C., 1906, The Juneau Gold Belt, Alaska: U.S. Geological Survey Bulletin 287, 161 p. Twenhofel, W.S., 1952, Geology of the Alaska-Juneau lode system, Alaska: U.S. Geological Survey Open-File Report 60, 170 p.

 
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: 2020.2.22 17:47:46 Page generated: 2018.7.11 01:04:11
Go to top of page