Prospect in Alaska, United States with commodity Zinc

Geologic information

Identification information

Deposit ID 10307805
Record type Site
Current site name Asmyrahha

Geographic coordinates

Geographic coordinates: -154.31595, 63.38049 (WGS84)
Relative position The Asmyrahha zinc prospect is 1.5 miles (2.4 km) east of Reef Ridge deposit (MD055) at an elevation of approximately 1,500 feet (457 m) in Section 30, T. 24 S., R. 24 E., of the Kateel River Meridian. Location is known to within 125 feet (38 m).
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Geographic areas

Country State
United States Alaska


Commodity Importance
Zinc Primary

Materials information

Materials Type of material
Smithsonite Ore
Dolomite Gangue


  • (Local) Ferricrete oxidation at surface.

Mineral occurrence model information

Model code 224
USGS model code 32a
BC deposit profile E12
Deposit model name Mississippi Valley, S.E. Missouri Pb-Zn
Mark3 model number 42

Host and associated rocks

  • Host or associated Host
    Stratigraphic age (youngest) Silurian

Nearby scientific data

(1) -154.31595, 63.38049

Comments on the geologic information

  • Geologic Description = Smithsonite-bearing rubble is exposed for 150 feet (45 m) of strike length in an old burn area. Host rock for the mineralization is a banded to micritic limestone that is probably equivalent to the Paradise Fork Formation of Dutro and Patton (1982); this is the 'Sic' unit of Andrews and Rishel (1982). The age of the mineralization is unknown. Smithsonite bearing carbonate units strike N 50 E and dip approximately 55 degrees South. Smithsonite mineralization is parallel to the strike of the limestone, but dips 15 degrees South along a low angle structure. Grab samples of the gossan contain up to 8.4 percent zinc with no appreciable lead. A trench cut at right angles to the strike of the ridgeline averaged 0.5 percent zinc and no lead across 10 feet (3 m).
  • Age = Host rocks are Silurian; age of mineralization is unknown.

Economic information

Economic information about the deposit and operations

Development status Prospect

Comments on exploration

  • Status = Inactive

Mining district

District name McGrath

Comments on the workings information

  • Workings / Exploration = The Asmyrahha prospect was discovered by WGM Inc. and Patino Ltd. during exploration for base metals in the late 1970s on lands selected by Doyon Ltd. (Andrews and Rishel, 1982). Grab samples of the gossan contain up to 8.4 percent zinc with no appreciable lead. A trench that was cut at right angles to the strike of the ridgeline averaged 0.5 percent zinc and no lead over 10 feet (3 m).

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Alaska Resource Data File ARDF MD080

Bibliographic references

  • Deposit

    Patton, W.W., Jr., Moll, E.J., Dutro, J.T., Jr., Silberman, M.L., and Chapman, R.M., 1980, Preliminary geologic map of Medfra quadrangle, Alaska: U.S. Geological Survey Open-File Report 80-811-A, 1 sheet, scale l:250,000.

  • Deposit

    Andrews, Tom, and Rishel, John, 1982, Annual Report for 198, Reef Ridge I-to-XIII Project Areas, Kuskokwim Block, Alaska: Anchorage, Alaska, WGM Inc., Project Report 4, 45 pages, two sheets at 1:63,360 and 1:20,000 scales. (Report held by Doyon, Limited, Fairbanks, Alaska.)

  • Deposit

    Dutro, T.T. Jr., and Patton,W.W. Jr., 1982, New Paleozoic Formations in the northern Kuskokwim Mountains, west-central Alaska: U.S. Geological Survey Bulletin 1529-H, p. H13-H22.

  • Deposit

    Schmidt, J.M., 1997, Shale-hosted Zn-Pb-Ag and barite deposits of Alaska, in Goldfarb, R.J., and Miller, L.D., eds., Mineral Deposits of Alaska, 1997: Economic Geology Monograph 9, p. 35-65.

Comments on the references

  • Primary Reference = Andrews and Rishel, 1982

General comments

Subject category Comment text
Deposit Model Name = Southeast Missouri lead-zinc (Cox and Singer, 1986; model no. 32a) or Mississippi Valley Type
Deposit Other Comments = See Soda Creek (MD056), Midway (MD046), and Saddle (MD054) and other Mississippi Valley Type zinc-lead showings in the Medfra quadrangle. The Asmyrahha prospect is on land selected or conveyed to Doyon Ltd. For further information, contact Doyon Ltd. at 210 1st Ave., Fairbanks, Alaska, 99701.

Reporter information

Type Date Name Affiliation Comment
Reporter 02-JUN-98 Bundtzen, T.K. Pacific Rim Geological Consulting