Pass

The Pass is a copper and lead 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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Site Name

Primary: Pass

Commodity

Primary: Copper
Primary: Lead
Secondary: Molybdenum
Secondary: Silver
Secondary: Zinc
Secondary: Antimony

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: Prospect
Operation Type: Unknown
Years of Production:
Organization:
Significant:

Physiography

Not available

Mineral Deposit Model

Model Name: Porphyry Cu-Mo

Orebody

Not available

Structure

Not available

Alterations

Alteration Type: L
Alteration Text: Iron-staining, silicification, and propylization of the dacite.

Rocks

Name: Dacite
Role: Associated
Age Type: Host Rock
Age Young: Pliocene

Name: Dacite
Role: Associated
Age Type: Associated Rock
Age Young: Pliocene

Analytical Data

Not available

Materials

Ore: Chalcopyrite
Ore: Galena
Ore: Molybdenite
Ore: Pyrite
Ore: Pyrrhotite
Ore: Silver
Ore: Tetrahedrite
Gangue: Quartz

Comments

Comment (Exploration): Status = Inactive

Comment (Workings): Workings / Exploration = Resource Associates of Alaska (1976) reported values up to 470 ppm Ag, 3000 ppm Cu, 1500 ppm Pb, and 3600 ppm Zn. Eakins and others (1978) reported a Mo anomaly of 66 ppm.

Comment (Reserve-Resource): Reserves = No reserves

Comment (Production): Production Notes = No production

Comment (Reference): Primary Reference = Nelson and others, 1985

Comment (Deposit): Model Name = Porphyry Cu - Mo ? (Cox and Singer, 1986; model 21a ?)

Comment (Deposit): Other Comments = No ore grade mineralization has been discovered (Nelson and others, 1985). Site is in Lake Clark National Park and Preserve.

Comment (Geology): Geologic Description = Iron-staining reported to be related to stockwork-fracture filling of pyrite and (or) pyrrhotite and varying amounts of chalcopyrite, galena, and tetrahedrite (?). Resource Associates of Alaska (1976) reported values up to 470 ppm Ag, 3,000 ppm Cu, 1,500 ppm Pb, and 3,600 ppm Zn. Mineralization is associated with a silicified, brecciated zone in propylitically altered dacite porphyry, possibly an explosive vent breccia, part of unit Tv (Nelson and others, 1983). Unit Tv includes rhyolitic breccia, ash-flow tuff, flows, and intrusive rocks and subordinate mafic to intermediate flows. Potassium-argon ages for Unit Tv range from 56.2 to 62.7 m.y. indicating a Tertiary age for these rocks (Eakins and others, 1978).

Comment (Geology): Age = Tertiary; potassium-argon ages for rocks of Unit Tv range from 56.2 to 62.7 m.y. (Eakins and others, 1978).

References

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): 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.

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 81-1343-B, 20 p.

Reference (Deposit): Young, L.E., St. George, P., and Bouley, B., 1997, Porphyry copper deposits in relation to the magmatic history and palinspastic restoration of Alaska, in Goldfarb, R.J., and Miller, L.D., (eds.), Mineral deposits of Alaska: Economic Geology Monograph 9, p. 306-333.

Reference (Deposit): Nokleberg, W.J., Bundtzen, T.K., Berg, H.C., Brew, D.A., Grybeck, D.J., Robinson, M.S., Smith, T.E., and Yeend, W., 1987, Significant metalliferous lode deposits and placer districts of Alaska: U.S. Geological Survey Bulletin 1786, 104 p.

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 81-1343-A, 25 p.

Reference (Deposit): Nelson, W.H., Carlson, C., and Case, J.E., 1983, Geologic map of the Lake Clark quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-1114-A, scale 1:250,000.

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