The Glass & Heifner is a gold and silver 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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Glass & Heifner MRDS details
Site Name
Primary: Glass & Heifner
Secondary: Little Creek
Secondary: Earl Mount
Commodity
Primary: Gold
Primary: Silver
Secondary: Zinc
Secondary: Lead
Secondary: Copper
Location
State: Alaska
District: Homer
Land Status
Not available
Holdings
Not available
Workings
Not available
Ownership
Not available
Production
Not available
Deposit
Record Type: Site
Operation Category: Prospect
Operation Type: Unknown
Years of Production:
Organization:
Significant:
Physiography
Not available
Mineral Deposit Model
Model Name: Low-sulfide Au-quartz vein
Orebody
Not available
Structure
Not available
Alterations
Alteration Type: L
Alteration Text: Borden and others (1991) report carbonization, sulfidization, sericitization, and silicification of the wall rock adjacent to the veins.
Rocks
Name: Slate
Role: Associated
Age Type: Host Rock Unit
Age Young: Paleocene
Name: Slate
Role: Associated
Age Type: Host Rock
Age Young: Paleocene
Name: Slate
Role: Associated
Age Type: Associated Rock Unit
Age Young: Paleocene
Name: Slate
Role: Associated
Age Type: Associated Rock
Age Young: Paleocene
Analytical Data
Not available
Materials
Ore: Sphalerite
Ore: Gold
Ore: Galena
Ore: Arsenopyrite
Gangue: Quartz
Comments
Comment (Geology): Age = Tertiary; Boden and others (1991) report other veins in the district are about 55 m.y. old.
Comment (Deposit): Model Name = Low-sulfide, Au-quartz vein (Cox and Singer, 1986; model 36a)
Comment (Deposit): Other Comments = This occurrence is within Kenai Fjords National Park, consequently the area is closed to mineral entry.
Comment (Geology): Geologic Description = Cretaceous Valdez Group massive graywacke is exposed in all the underground workings and in most of the surface outcrops. The only black slate and siltstones in the vicinity are exposed in the eastern and southeastern most prospect pits. Foliation and bedding in this area trends N10 to 30E and dips 50 to 60NW (Richter, 1970). ? At least three major quartz veins are exposed on the property. All the quartz veins generally strike east-west and dip to the north. The northern most and principal vein is sporadically exposed in the surface working for about 350 feet and underground for 125 feet. At its western extremity, the vein has a consistent moderate dip of 40 to 60N, but toward the east the dip steepens to more than 80N. The vein ranges from one to five feet wide and consists of white quartz with massive lens and sheets of arsenopyrite (Richter, 1970). Two samples cut randomly across the vein in the main drift assayed 72 and 0.2 ppm gold (Richter, 1970). ? A second and much shorter vein is exposed 100 feet south of the main vein in two surface trenches about 100 feet apart. The vein generally strikes east-west and dips 84 to 87N. This vein contains only minor sulfides, but Pilgrim (1933) reported that abundant free coarse gold was panned from samples of this vein. This vein does not extend in depth to the underground workings. ? Sixty feet further south, a third vein is exposed over a distance of 150 feet in pits and trenches. The third vein is also exposed in a short drift off the main adit. The vein has been stoped from the adit to the surface, the stoped area contained abundant galena and free gold (Pilgrim, 1933). Overall, the vein is lens shaped and pinches out to the east and west. A channel sample from the vein (Richter, 1970) contained 2 ppm gold.
Comment (Exploration): Status = Inactive
Comment (Workings): Workings / Exploration = Four hundred and fifty feet of tunnels were driven in 1932 through 1934, but the amount of ore delineated was not enough to justify a mill (Capps, 1938). Some small-scale, surface mining took place in 1967 (Richter, 1970).
Comment (Reference): Primary Reference = Richter, 1970
References
Reference (Deposit): Capps, S.R., 1938, Lode mining in the Nuka Bay district, in Smith, P.S., Mineral industry of Alaska in 1936: U.S. Geological Survey Bulletin 897-A, p. 25-32.
Reference (Deposit): Cobb, E.H., 1979, Summary of references to mineral occurrences (other than minerals fuels and construction materials) in the Seldovia quadrangle, Alaska: U.S. Geological Survey Open-file Report 80-87, 47 p.
Reference (Deposit): Richter, D.H., 1970, Geology and lode-gold deposits of the Nuka Bay area, Kenai Peninsula, Alaska: U.S. Geological Survey Professional Paper 625-B, p. Bl-B16.
Reference (Deposit): MacKevett, E.M., Jr., and Holloway, C.D., 1977, Map showing metalliferous and selected non-metalliferous mineral deposits in the eastern part of southern Alaska: U.S. Geological Survey Open-File Report 77-169-A, 99 p., 1 sheet, scale 1:1,000,000.
Reference (Deposit): Borden, J.C., Goldfarb, R.J., Gent, C.A., Burruss, R.C., and Roushey, B.H., 1992 Geochemistry of lode-gold deposits, Nuka Bay district, southern Kenai Peninsula: Geologic studies in Alaska by the U.S. Geological Survey, 1991: U.S. Geological Survey Bulletin 2041, p. 13-21.
Reference (Deposit): Pilgrim, E.R., 1933, Progress of lode mining in interior Alaska, 1932: Alaska Territorial Department of Mines Miscellaneous Report 194, 11 p.
Reference (Deposit): Cobb, E.H., 1972, Metallic minerals resources map of the Seldovia quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-397, 1 sheet, scale 1:250,000.
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