Unnamed Occurrence (ARDF - ID054; near Hickey Creek), Iditarod Mining District, Yukon-Koyukuk Census Area, Alaska, USAi

Regional Level Types
Unnamed Occurrence (ARDF - ID054; near Hickey Creek)	- not defined -
Iditarod Mining District	Mining District
Yukon-Koyukuk Census Area	Census Area
Alaska	State
USA	Country

Location: 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.
Geology: 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.
Workings: The area was sampled by the U.S. Geological Survey in 1985 (McGimsey and others, 1988).
Age: Probably genetically related to the host rock, the serpentinite of the Jurassic Dishna River ophiolite (Miller, 1990).
Alteration: Serpentinization.

Commodities (Major) - Ag, Cr, Ni; (Minor) - As
Development Status: None
Deposit Model: Dunitic Ni-Cu or Podiform Chromite (Cox and Singer, 1986; models 6a and 8b).

Other Databases

Link to USGS - Alaska:	ID054

Other Regions, Features and Areas containing this locality

References