Unnamed (in upper Granite Creek)

Prospect, Inactive

Commodities and mineralogy

Main commodities Ag; Cu; Zn
Ore minerals chalcopyrite; pyrite; sphalerite
Gangue minerals clay; quartz

Geographic location

Quadrangle map, 1:250,000-scale TK
Quadrangle map, 1:63,360-scale B-2
Latitude 62.2896
Longitude -147.9462
Nearby scientific data Find additional scientific data near this location
Location and accuracy This prospect extends for 2 miles along upper Granite Creek. It is centered at an elevation of 5,200 feet, 0.4 mile due north of the center of sec. 3, T. 25 N., R. 8 E., Seward Meridian. The location is accurate to within 1/2 mile.

Geologic setting

Geologic description

This prospect consists of chalcopyrite, pyrite, and sphalerite(?) in a siliceous gouge zone near the contact between Upper Jurassic diorite and tuffaceous volcanic rocks of the Lower Jurassic, Talkeetna Formation (Kurtak and others, 1992). The gouge zone strikes N20E and dips 70 W. Rock samples from the south, valley wall of upper Granite Creek contain 1.2 part per million silver, 436 parts per million zinc, and 6,640 parts per million copper (Clautice and others, 1990). A U.S. Bureau of Mines 3.5-foot-long, chip sample of an iron-stained zone contains 0.87 percent zinc and 0.16 percent copper. A sulfide-rich float sample collected nearby contains 1.5 ounce silver per ton, 5.8 percent copper, and 2.4 percent zinc (Kurtak and others, 1992). This prospect may be genetically related to prospects at TK097 and TK098. Claims were staked in 1971 by Leo Mark Anthony, who conducted grid soil sampling and trenching.
Geologic map unit (-147.948390446397, 62.2891253512902)
Mineral deposit model Polymetallic vein (Cox and Singer, 1986; model 22c)
Mineral deposit model number 22c
Alteration of deposit Alteration includes clay and silicification in fault gouge. Iron-oxide staining.

Production and reserves

Workings or exploration Claims were staked in 1971 by Leo Mark Anthony, who conducted grid soil sampling and trenching. Rock samples collected the Alaska Division of Geological and Geophysical Surveys and the U.S. Bureau of Mines (Clautice and others, 1990; Kurtak and others, 1992).
Indication of production None

Additional comments

MAS/MILS number 20760059.

References