Unnamed Occurrence (ARDF - HE067; northeast wall of Eldridge Glacier), Valdez Creek Mining District, Matanuska-Susitna Borough, Alaska, USAi

Regional Level Types
Unnamed Occurrence (ARDF - HE067; northeast wall of Eldridge Glacier)	- not defined -
Valdez Creek Mining District	Mining District
Matanuska-Susitna Borough	Borough
Alaska	State
USA	Country

Location: This occurrence is at an elevation of about 2,400 feet in a stream valley draining the northeast wall of Eldridge Glacier. It is in sec. 14, T. 22 S., R. 13 W., of the Fairbanks Meridian. The localion is accurate to within 0.5 mile. This is locality 27 of Cobb (1978: OFR 78-1062).
Geology: The country rocks in the area of this occurrence are a tectonically intermixed assemblage of Upper Devonian serpentinite, basalt, chert, and gabbro. The occurrence consists of massive pyrite and chalcopyrite in irregular and veinlike masses in serpentinite. Some of the chalcopyrite is oxidized to malachite. Rock samples contained 15 ppm silver, 0.1 ppm gold, 50 ppm nickel and 7.5% copper (Hawley and Clark, 1974). The sulfide minerals herein are assumed to be remobilized syngenetic magmatic segregations in the mafic host rocks.
Workings: Rock samples contained 15 ppm silver, 0.1 ppm gold, 50 ppm nickel and 7.5% copper (Hawley and Clark, 1974).
Age: Probably Late Devonian, remobilized in Late Mesozoic or Tertiary.

Commodities (Major) - Cu; (Minor) - Ag, Au, Ni
Development Status: None
Deposit Model: Cyprus massive sulfide (Cox and Singer, 1986; model 24a)

Other Databases

Link to USGS - Alaska:	HE067

Other Regions, Features and Areas containing this locality

References