The Twin Lakes West is a zinc mine located in Alaska.
About the MRDS Data:
All mine locations were obtained from the USGS Mineral Resources Data System. The locations and other information in this database have not been verified for accuracy. It should be assumed that all mines are on private property.
Mine Info
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Twin Lakes West MRDS details
Site Name
Primary: Twin Lakes West
Commodity
Primary: Zinc
Secondary: Lead
Tertiary: Copper
Location
State: Alaska
District: Bristol Bay
Land Status
Not available
Holdings
Not available
Workings
Not available
Ownership
Not available
Production
Not available
Deposit
Record Type: Site
Operation Category: Occurrence
Operation Type: Unknown
Discovery Year: 1976
Years of Production:
Organization:
Significant: N
Deposit Size: S
Physiography
Not available
Mineral Deposit Model
Not available
Orebody
Not available
Structure
Not available
Alterations
Alteration Type: L
Alteration Text: The Volcanic Rocks Have Undergone Epidote And Chlorite Alteration, Silicification, And Lesser Sericitization.
Rocks
Not available
Analytical Data
Not available
Materials
Ore: Sphalerite
Ore: Galena
Ore: Hematite
Ore: Pyrite
Ore: Chalcopyrite
Gangue: Chlorite
Gangue: Calcite
Gangue: Epidote
Comments
Comment (Workings): NONE, OCCURRENCE ONLY
Comment (Deposit): SITE IS IN LAKE CLARK NATIONAL PARK AND PRESERVE.
Comment (Deposit): THIS SITE NAME WAS CREATED BY THE REPORTER OR OTHER USGS EMPLOYEE BASED ON PROXIMITY TO SOME MAJOR GEOGRAPHIC FEATURE.
Comment (Reserve-Resource): NO RESERVES
Comment (Production): NO PRODUCTION
Comment (Deposit): MINERALIZATION OCCURS AS FINE-GRAINED DISSEMINATIONS AND HAIRLINE FRACTURE FILLINGS OF PYRITE AND LESSER CHALCOPYRITE, SPHALERITE, AND GALENA IN SILICIFIED RHYOLITE AND RHYOLITE-DACITE VOLCANIC ROCKS AND BRECCIAS (NELSON AND OTHERS, 1983). RESOURCE ASSOCIATES OF ALASKA (1976) CONSIDERED THE SETTING AS A POSSIBLE VOLCANIC VENT CENTER. THESE ROCKS HAVE UNDERGONE EPIDOTE AND CHLORITE ALTERATION, SILICIFICATION, AND LESSER SERICITIZATION. THE VOLCANIC ROCKS HAVE POTASSIUM-ARGON AGES THAT RANGE FROM 56.2 TO 62.7 M.Y. (EAKINS AND OTHERS, 1978).
Comment (Location): ABOUT 2.1 KM NORTH OF THE EASTERN ARM OF TWIN LAKES ON PEAK 5,280. THE 1.3 KM WIDE, OVAL-SHAPED OCCURRENCE EXTENDS APPROXIMATELY 7.3 KM S-SE ACROSS TWIN LAKES, TERMINATING NEAR PEAK 5,570. CORRESPONDS WITH LOCALITY 11 OF NELSON AND OTHERS (1985) AND LOCALITY 21 OF MACKEVETT AND HOLLOWAY (1977). SEC. 22, T. 7 N., R. 26 W., OF THE SEWARD MERIDIAN. LONGITUDE AND LATITUDE OF OCCURRENCE IS ACCURATE WITHIN 1,200 M.
Comment (Geology): THE VOLCANIC ROCKS THAT HOST THE MINERALIZATION HAVE POTASSIUM-ARGON AGES THAT RANGE FROM 56.2 TO 62.7 M.Y. (EAKINS AND OTHERS, 1978).
Comment (Exploration): Status = Inactive
References
Reference (Other Database): BAG-MF-1114-B-11
Reference (Deposit): MacKevett, E.M., Jr., and Holloway, C.D., 1977, Map showing metalliferous mineral deposits in the western part of southern Alaska: U.S. Geological Survey Open-File Report 77-169-F, 38 p., 1 sheet, scale 1:1,000,000.
Reference (Deposit): Cobb, E.H., and Reed, B.L., 1981, Summaries of data on and lists of references to metallic and selected nonmetallic mineral occurrences in the Iliamna, Lake Clark, Lime Hills, and McGrath quadrangles, Alaska - Supplement to Open-File Report 76-485: U.S. Geological Survey Open-File Report 81-1343B, 20 p.
Reference (Deposit): Nelson, W.H., King, H.D., Case, J.E., Tripp, R.B., Crim, W.D., and Cooley, E.F., 1985, Mineral resource map of the Lake Clark quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-1114-B, 1 sheet, scale 1:250,000.
Reference (Deposit): Nelson, W.H., King, H.D., Case, J.E., Tripp, R.B., Crim, W.D., and Cooley, E.F., 1985, Mineral resource map of the Lake Clark quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-1114-B, scale 1:250,000.
Reference (Deposit): Eakins, G.R., Gilbert W.G., and Buntzen, T.K., 1978, Preliminary bedrock geology and mineral resource potential of west-central Lake Clark quadrangle, Alaska: Alaska Division of Geological and Geophysical Surveys Open-File Report 118, 15 p.
Reference (Deposit): Resource Associates of Alaska, Inc., 1976, Geology and geochemistry of certain land within the Lake Clark National Park: (Contract report for U.S. Bureau of Mines), 109 p.
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