Unnamed (ridge between Madison and Crevice Creeks)

Occurrence, Inactive

Commodities and mineralogy

Main commodities Cr; Ni
Other commodities Pb; Zn
Ore minerals arsenopyrite; sphalerite

Geographic location

Quadrangle map, 1:250,000-scale WI
Quadrangle map, 1:63,360-scale B-4
Latitude 67.3507
Longitude -151.6897
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is on a ridge between Crevice Creek and Madison Creek at an elevation of 3900 feet, near the center of section 12, T. 29 N., R. 19 W., of the Fairbanks Meridian. This is the site of sample 71 in Dillon and others (1981 [AOF 133B]). The location is accurate.

Geologic setting

Geologic description

This occurrence consists of a fuchsite-muscovite-calcite quartzite (Dillon and others, 1981 [AOF 133B]) in Middle or Upper Devonian(?), chloritic and carbonate rocks (Dillon and others, 1986). A grab sample contains 1000 ppm chromium, (probably attributable to the fuchsite) and 200 ppm nickel, as well as 500 ppm arsenic, and 200 ppm lead. The analytical data suggest that sphalerite and arsenopyrite might be present but neither was visible in the sample.
Geologic map unit (-151.692438845158, 67.3502419808374)

Production and reserves

Workings or exploration Only surface sampling.
Indication of production None