Bonanza Hills

The Bonanza Hills is a silver, 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: Bonanza Hills
Secondary: Main Saddle

Commodity

Primary: Silver
Primary: Copper
Primary: Lead
Secondary: Gold

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: Polymetallic veins
Model Name: Porphyry Cu

Orebody

Not available

Structure

Not available

Alterations

Alteration Type: L
Alteration Text: Unknown

Rocks

Not available

Analytical Data

Not available

Materials

Ore: Arsenopyrite
Ore: Chalcopyrite
Ore: Galena
Ore: Tetrahedrite
Gangue: Quartz

Comments

Comment (Geology): Age = Tertiary to Cretaceous or younger.

Comment (Exploration): Status = Inactive

Comment (Workings): Workings / Exploration = Channel samples have average values of 103 g/t (3 oz/ton) Ag and 0.5 percent combined Cu and Pb. Analyses also yield gold up to 2.24 ppm (Eakins and others, 1978).

Comment (Deposit): Other Comments = None.

Comment (Production): Production Notes = No production

Comment (Reference): Primary Reference = Eakins and others, 1978

Comment (Geology): Geologic Description = A quartz-sulfide vein system containing tetrahedrite, arsenopyrite, galena, and chalcopyrite cuts sedimentary rocks and dacite hornfels. One vein system is exposed as 3-meter-wide zone of quartz sulfide 'splatter' veinlets that extends at least 150 meters along strike and to a depth of 50 meters. Channel samples have average values of 103 g/t (3 oz/ton) Ag and 0.5 percent combined Cu and Pb. Analyses also yield gold up to 2.24 ppm (Eakins and others, 1978).? the contact-metamorphosed dacite flow and sedimentary sequence is part of unit KJs (Nelson and others, 1983). It consists of interbedded lithic graywacke, silty sandstone, black shale , and local conglomerate. Irregular quartz segregations and veinlets are locally present. Scattered stocks and locally abundant dikes of intermediate to felsic composition intrude these sedimentary rocks. Contact aureoles of pelitic hornfels are adjacent to some of the larger igneous bodies. The nearby intrusive rocks include rhyolite dikes and a Late Cretaceous, two-mica, hypabyssal, granite pluton (Nokleberg and others, 1997).

Comment (Reserve-Resource): Reserves = Nokleberg and others (1987; 1997) report an estimated 45,000 tonnes grading 81 g/t Ag, 0.15 g/t Au, 0.15% Cu, and 0.67 percent Pb.

Comment (Deposit): Model Name = Porphyry Cu or Polymetallic vein (Cox and Singer, 1986; model 17 or 22c)

References

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): 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): Nokleberg, W.J., Bundtzen, T.K., Dawson, K.M., Eremin, R.A., Goryachev, N.A., Koch, R.D., Ratkin, V.V, Rozenblum, I.S., Shpikerman, V.I., Frolov, Y.F., Gorodinsky, M.E., Melnikov, V.D., Diggles, M.F., Ognyanov, N.V., Petrachenko, E.D., Petrochenko, R.I., Pozdeev, A.I., Ross, K.V., Wood, D.H., Grybeck, D., Khanchuck, A.I., Kovbas, L.I., Nekrasov, I.Y., and Sidorov, A.A., 1997, References for significant metalliferous and selected non-metalliferous lode mineral deposits and placer districts, and for metallogenesis of the Russian Far East, Alaska, and the Canadian Cordillera: U.S. Geological Survey Open-File Report 96-513-B, 385 p.

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): 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.

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.

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