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Kizhuyak Lode, Mid

Prospect, Inactive

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Commodities and mineralogy

Main commodities Ag; Au; Cu
Ore minerals arsenopyrite; chalcopyrite; gold; pyrite; pyrrhotite; sphalerite; stibnite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale KD
Quadrangle map, 1:63,360-scale D-2
Latitude 57.878
Longitude -152.637
Nearby scientific data Find additional scientific data near this location
Location and accuracy This prospect is located on the southeast coast of Larsen Island in sec. 35, T. 26 S., R. 21 W., of the Seward Meridian (Berg and Cobb, 1967, figure 15, locality 7; Rose and Richter, 1967, figure 1, locality 5; Cobb, 1972, MF 460, locality 15; McGee, 1972, locality 2; MacKevett and Holloway, 1977, locality 14. Site location is accurate to within a few hundred feet.

Geologic setting

Geologic description

This prospect, first staked in 1903 or 1904, is the northern extension of Kizhuyak Lode, south (KD018). The showings had been worked on and off by several persons up to the time of Capps' visit in 1934 (Capps, 1937) and Roehm's visit in 1936 (Roehm, 1936, PE 131-1). The quartz vein cuts granodiorite, strikes north-south to N.15 E., and dips steeply to the west. The vein is 3 to 5 feet in thickness and in most places is only slightly mineralized; however, local bands of nearly massive sulfides do occur, in some places up to 4 feet in thickness. The sulfides consist of arsenopyrite, pyrite, pyrrhotite, and traces of chalcopyrite. Roehm (1936, PE 131-1) also mentions sphalerite and stibnite, apparently present in only minor amounts. Disseminated pyrrhotite is present in the wallrock adjacent to the vein.
A dump sample collected by Rose and Richter assayed 0.16 ounce per ton gold, 1.00 ounce per ton silver, trace copper, and 5.5 percent arsenic. A grab sample collected by Capps ran 0.14 ounce per ton gold, and 0.74 ounce per ton silver. Roehm collected 2 samples here and reported 0.02 to 0.48 ounce per ton gold and 0.10 to 1.00 ounce per ton silver. Roehm also collected a sample of the lode on the small islet just to the south and reported 0.30 ounce per ton gold and 0.40 ounce per ton silver.
Geologic map unit (-152.639193490075, 57.8772636453648)
Mineral deposit model Chugach-type low-sulfide gold-quartz vein (Bliss, 1992; model 36a.1).
Mineral deposit model number 36a.1
Age of mineralization Tertiary

Production and reserves

Workings or exploration At the time of Capps' and Roehm's visits (1934 and 1936) this prospect was developed by a 33-foot adit driven northward from the beach and an open cut located about 500 feet northeast of the adit. Several tons of sulfide ore were stacked at the portal to the adit in 1934 but there is no record of any production. Sampling by Capps, Rose and Richter, and Roehm reported 0.02 to 0.48 ounce per ton gold and 0.10 to 1.00 ounce per ton silver.
Indication of production None

Additional comments

Site is on land conveyed to the Koniag Corporation.

References

MRDS Number A015102

References

Berg, H.C., and Cobb, E.H., 1967, Metalliferous lode deposits of Alaska: U.S. Geological Survey Bulletin 1246, 254 p.
Capps, S.R., 1937, Kodiak and adjacent islands, in Smith, P.S. and others, Mineral resources of Alaska, report on progress of investiagtions in 1935: U.S. Geological Survey Bulletin 880-C, p. 111-184, 1 plate, scale 1:250,000.
Cobb, E.H., 1972, Metallic mineral resources map of the Kodiak quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-460, 1 map sheet, scale 1:250,000.
Cobb, E.H., 1979, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Afognak, Karluk, Kodiak, and Trinity Islands quadrangles, Alaska: U.S. Geological Survey Open-File Report 79-860, 49 p.
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.
McGee, D.L., 1972, Kodiak Island and vicinity, Alaska: Geology and mineral resources: Alaska Division of Geological & Geophysical Surveys Alaska Open-File Report 31, 7 p., 1 sheet, scale 1:250,000.
Roehm, J.C., 1936, Preliminary report of Kizhuyak Group, Kodiak Island, Alaska: Alaska Territorial Department of Mines Prospect Evaluation 131-1, 3 p. (1 sheet, scale 1 inch=3,300 feet).
Rose, A.W., and Richter, D.H., 1967, Geology and stream sediment geochemistry of Anton Larsen Bay and vicinity, Kodiak Island, Alaska: Alaska Division of Mines and Minerals Geologic Report 31, 10 p., 1 sheet, scale 1:63,360.
Reporters S.H. Pilcher (Anchorage)
Last report date 10/5/1998