Unnamed (near VABM West Watana)

Occurrence, Inactive

Commodities and mineralogy

Main commodities Cu; Mo
Ore minerals arsenopyrite; malachite; pyrite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale TK
Quadrangle map, 1:63,360-scale D-2
Latitude 62.9583
Longitude -147.8945
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is at an elevation of about 5,000 feet,on a north-trending ridge about 1 3/4 miles west of VABM Watana. The occurrence is near the center of the SE1/4 sec. 34, T. 22 S., R. 2 W., Fairbanks Meridian. The location is accurate to within 1/4 mile. This is locality B18 of Kurtak and others (1992).

Geologic setting

Geologic description

The rocks in the vicinity of this occurrence are Triassic metabasalt (Csejtey and others, 1978). Immediately to the west, the metabasalt is in fault contact with Upper Jurassic sedimentary and volcanic rocks. The metabasalt is iron stained and contains quartz veins and disseminated pyrite and arsenopyrite (Kurtak and others, 1992). Malachite locally coats the outcrop. Rock samples collected by the U.S. Geological Survey contain 20 parts per million molybdenum (Miller and others, 1978). Samples collected by the U.S. Bureau of Mines contain up to 765 parts per million arsenic and 193 parts per mission copper, but no molybdenum (Balen, 1990). As of January 1, 2000, a block of approximately 96 state mining claims covered this and adjacent prospects (Northern Associates Inc., written communication, 2001).
Geologic map unit (-147.896750794821, 62.9578440566379)
Mineral deposit model Basaltic copper? (Cox and Singer, 1986; model 23?)
Mineral deposit model number 23?
Age of mineralization Occurs in Triassic metabasalt.
Alteration of deposit Oxidation of copper mineral; iron oxides.

Production and reserves

Workings or exploration Sampling by the U.S. Bureau of Mines and U.S. Geological Survey (Miller and others, 1978; Balen, 1990). As of January 1, 2000, a block of approximately 96 state mining claims covered this and adjacent prospects (Northern Associates Inc., written communication, 2001).
Indication of production None

Additional comments

MAS/MILS number 20760087.

References