Unnamed (upper Blind Creek area)

Occurrence, Inactive

Commodities and mineralogy

Main commodities Ag; Au
Ore minerals gold; pyrite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale HE
Quadrangle map, 1:63,360-scale A-6
Latitude 63.212
Longitude -149.692
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is at an elevation of about 3,800 feet south of upper Blind Creek, a tributary of the West Fork Chulitna River. It is in the NE1/4 of sec. 5, T. 20 S., R. 11 W., of the Fairbanks Meridian. Accuracy is to within 1,000 feet. The site is shown in Hawley and Clark (1968), and Hawley and Clark (1974).

Geologic setting

Geologic description

The country rocks in the area of this occurrence are Triassic sedimentary strata that have been strongly faulted along a strand of the Blind Creek fault. The fault zone is up to 200 feet wide and approximately 3000 feet long; it is locally pyritized and limonite stained. The deposit consists of quartz-pyrite veins. The quartz is colloform in places. Surface samples from a quartz vein contained 0.06 ppm to 0.30 ppm gold and 0.5 to 1.5 ppm silver (Hawley and Clark, 1968).
Geologic map unit (-149.694293096685, 63.2115253926177)
Mineral deposit model Polymetallic vein or Hot-spring Ag-Au (Cox and Singer, 1986; models 22c, 25a)
Mineral deposit model number 22c, 25a
Alteration of deposit Pyritization; iron-staining.

Production and reserves

Workings or exploration Surface samples only. Surface samples from a quartz vein contained 0.06 ppm to 0.30 ppm gold and 0.5 to 1.5 ppm silver (Hawley and Clark, 1968).
Indication of production None

Additional comments

This deposit is similar in some ways to the Bunkhouse and Lupin deposits (HE039 and HE038).

References