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Bonanza Hills

Prospect in Alaska, United States with commodities Silver, Copper, Lead, Gold
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Sections on this page
  1. Identification information
  2. Geographic coordinates
  3. Site location context
  4. Geographic areas
  5. Commodities
  6. Materials information
  7. Alteration
  8. Mineral occurrence model information
  9. Host and associated rocks
  10. Nearby scientific data
  11. Economic information about the deposit and operations
  12. Mining district
  13. Links to other databases
  14. Bibliographic references
  15. General comments
  16. Reporter information

Geologic information

Identification information

Deposit ID 10002117
MRDS ID A013008
Record type Site
Current site name Bonanza Hills
Alternate or previous names Main Saddle

Geographic coordinates

Geographic coordinates: -154.59577, 60.70554 (WGS84)
Relative position Occurrence extends about 1.5 km along a ridge, between peak 3,860 and peak 3,966, in the Bonanza Hills, approximately 3.5 km E-SE of Little (Upper) Bonanza Creek. Locality 9 of Nelson and others (1985) and locality 130 of Eakins and others (1978). SW1/4SW1/4 sec. 6, T. 7 N., R. 30 W., of the Seward Meridian. Locality accurate within 400 m.

Site location context

Political divisions (FIPS codes)

Lake and Peninsula(Borough)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Lake Clark C-5(quadrangle 1:63,360 scale)

Lake Clark NW(quadrangle 1:100,000 scale)

Lake Clark C(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Mulchatna River(hydrologic unit)

Nushagak River(hydrologic accounting unit)

Southwest(hydrologic subregion)

Alaska(hydrologic region)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Silver Primary
Copper Primary
Lead Primary
Gold Secondary

Materials information

Materials Type of material
Arsenopyrite Ore
Chalcopyrite Ore
Galena Ore
Tetrahedrite Ore
Quartz Gangue

Alteration

  • (Local) Unknown

Mineral occurrence model information

Model code 53
USGS model code 17
Deposit model name Porphyry Cu
Mark3 model number 4
Model code 85
USGS model code 22c
Deposit model name Polymetallic veins
Mark3 model number 46

Host and associated rocks

  • Host or associated Host
    Rock type Sedimentary Rock > Clastic Sedimentary Rock > Argillite

Nearby scientific data

(1) -154.59577, 60.70554
ListMap

Economic information

Comments on the geologic information

  • 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).
  • Age = Tertiary to Cretaceous or younger.

Economic information about the deposit and operations

Development status Prospect
Commodity type Metallic

Comments on exploration

  • Status = Inactive

Mining district

District name Bristol Bay

Comments on the production information

  • Production Notes = No production

Comments on the reserve resource information

  • 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.

Comments on the workings information

  • 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).

Reference information

Bibliographic references

  • 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.

  • 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.

  • 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.

  • 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.

  • 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.

  • 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.

Comments on the references

  • Primary Reference = Eakins and others, 1978

General comments

Subject category Comment text
Deposit Model Name = Porphyry Cu or Polymetallic vein (Cox and Singer, 1986; model 17 or 22c)
Deposit Other Comments = None.

Reporter information

Type Date Name Affiliation Comment
Reporter 15-JUN-1998 M.L. Miller U.S. Geological Survey
Reporter 15-JUN-1998 D.P. Bickerstaff U.S. Geological Survey

Beyond USGS

Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.

Maps centered on this site

Authoritative Alaska resources

These are landing pages for further research — the state agencies don't currently expose per-mine deep links.