Unnamed (northwest of Gilroy Mountain)

Occurrence, Inactive

Commodities and mineralogy

Main commodities Ag; As; Au
Other commodities Bi; Cu; Sb; Zn
Ore minerals arsenopyrite; chalcopyrite; sphalerite

Geographic location

Quadrangle map, 1:250,000-scale WI
Quadrangle map, 1:63,360-scale A-4
Latitude 67.2451
Longitude -151.5814
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is at an elevation of about 3,300 feet about 2.0 miles west-northwest of the top of Gilroy Mountain. The site corresponds to the location of samples 50 and 51 in Dillon and others (1981). The location is accurate.

Geologic setting

Geologic description

This occurrence consist of a stockworks of small sulfide veins in marble (Dillon and others, 1981 [AOF 133B]). They collected two grab samples. A fine-grained actinolite marble contains narrow veins of chalcopyrite and sphalerite; a gray marble contains veins of arsenopyrite, sphalerite, and traces of chalcopyrite. The arsenopyrite veins were as much as 10 cm thick. The arsenopyrite-bearing sample contains 10 ppm silver, 10% arsenic, 15 ppm gold, 50 ppm bismuth, and 300 ppm antimony. The other sample contained no anomalous metal values. The rocks in the area are mainly Devonian, Ambler metavolcanic rocks (Dillon and others, 1986).
Geologic map unit (-151.584130785595, 67.244642326395)
Mineral deposit model Polymetallic vein? (Cox and Singer, 1986; model 22c?).
Mineral deposit model number 22c?

Production and reserves

Workings or exploration Only surface sampling.
Indication of production None