Unnamed (near Clark Creek)

Occurrence, Inactive

Commodities and mineralogy

Main commodities Ag; Cu; Pb; Zn
Other commodities Au; Bi; Cd
Ore minerals pyrite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale TK
Quadrangle map, 1:63,360-scale D-4
Latitude 62.9542
Longitude -148.6446
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is at an elevation of about 4,500 feet on the northeast side of Clark Creek; it is about 0.4 mile northwest of the top of hill 4823 and about 0.4 mile north of the center of sec. 14, T. 33 N., R. 6 W. of the Seward Meridian. The location is accurate to within 1/4 mile.

Geologic setting

Geologic description

This occurrence is a gossan of orange soil that consists of silicified and quartz-pyrite-veined aplite with iron- and manganese-oxide staining; chalky, altered leucogranodiorite; and biotite granodiorite with iron-oxide-coated fractures (J. Schmidt, writtencommunication, 2001). U.S. Geological Survey samples of the aplite contain up to 26.6 parts per million silver, 18,900 parts per million zinc, 1,660 parts per million lead, 1,480 parts per million copper, 126 parts per million cadmium, 15 parts per million bismuth, and 0.2 part per million gold. (The 0.2-part-per-million gold value is from an ICP analysis done by XRAL Laboratories; a fire assay of the same sample shows 0.020 part per million gold. The cause of the discrepancy is not known.)
Geologic map unit (-148.646856625752, 62.9537308102797)
Mineral deposit model Polymetallic veins? (Cox and Singer, 1986; model 22c?)
Mineral deposit model number 22c?
Alteration of deposit The leucogranodiorite is altered to clay and the aplite is silicified. Local iron- and manganese-oxide staining.

Production and reserves

Workings or exploration Only surface sampling by U.S. Geological Survey (J. Schmidt, written communication, 2001).
Indication of production None

References