Unnamed (near Hickey Creek)

Occurrence, Inactive

Commodities and mineralogy

Main commodities Ag; Cr; Ni
Other commodities As
Ore minerals chromite
Gangue minerals serpentinite

Geographic location

Quadrangle map, 1:250,000-scale ID
Quadrangle map, 1:63,360-scale C-4
Latitude 62.69285
Longitude -157.8699
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is on a south-facing bluff beside Hickey Creek about 1 mile upstream from its mouth on Moose Creek. The occurrence is at an elevation of about 450 feet, about 0.5 mile east-northeast of the center of section 15, T. 30 N., R. 46 W., of the Seward Meridian. The location is accurate.

Geologic setting

Geologic description

This occurrence is in serpentinized ultramafic rock of the Jurassic Dishna River ophiolite (Miller, 1990; Miller, Bundtzen, and Gray, 2005). Rubble crop near the base of the hill locally contains disseminated chromite. Grab samples contain up to 30.0 parts per million (ppm) silver, 2,000 ppm nickel, 2,000 ppm chromium, and anomalous arsenic (McGimsey and others, 1988). The chromium and nickel are probably in both spinel (chromite) and in silicate minerals (olivine and pyroxene) of the ultramafic rocks.
Geologic map unit (-157.872292360548, 62.692175957919)
Mineral deposit model Dunitic Ni-Cu or Podiform Chromite (Cox and Singer, 1986; models 6a and 8b).
Mineral deposit model number 6a or 8b
Age of mineralization Probably genetically related to the host rock, the serpentinite of the Jurassic Dishna River ophiolite (Miller, 1990).
Alteration of deposit Serpentinization.

Production and reserves

Workings or exploration The area was sampled by the U.S. Geological Survey in 1985 (McGimsey and others, 1988).
Indication of production None

References