Kizhuyak Lode, Mid

Prospect, Inactive

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.


MRDS Number A015102


Reporters S.H. Pilcher (Anchorage)
Last report date 10/5/1998