Unnamed Occurrence (ARDF - TK036; northwest of lower Jay Creek), Valdez Creek Mining District, Matanuska-Susitna Borough, Alaska, USAi

Regional Level Types
Unnamed Occurrence (ARDF - TK036; northwest of lower Jay Creek)	- not defined -
Valdez Creek Mining District	Mining District
Matanuska-Susitna Borough	Borough
Alaska	State
USA	Country

MAS/MIL number 20760113.
Location: This occurrence is at an elevation of about 3,680 feet, northwest of lower Jay Creek. It is 0.6 mile north of hill 4008, in the SW1/4 sec. 19, T. 32 N., R. 9 E., Seward Meridian. The location is accurate to within 1/4 mile. The occurrence is locality B30 of Kurtak and others (1992).
Geology: The rocks in the vicinity of this occurrence are felsic(?) and intermediate to mafic metavolcanic rocks, chlorite schist, and sericite schist (Csejtey and others, 1978; Kurtak and others, 1992). The rocks are cut by quartz veins, locally stained tan-orange, that contain finely disseminated hematite, pyrrhotite, and pyrite (Kurtak and others, 1992). The U.S. Bureau of Mines sampled the stained areas in 1988 (Kurtak and others, 1992). Pyritic schist contains up to 212 parts per million zinc, and hematite-rich rock contains up to 124 parts per million copper. Gold values vary up to 10 parts per billion and silver values to 0.5 parts per million . Intermediate intrusive rocks in the area sampled by the U.S. Geological Survey contain up to 550 parts per million copper, 1 part per million silver, and 200 parts per million arsenic (Miller and others, 1978).
Workings: Only surface sampling by the U.S. Bureau of Mines (Kurtak and others, 1992) and the U.S. Geological Survey (Miller and others, 1978).
Alteration: Local bleaching and iron staining (Kurtak and others, 1992).

Commodities (Major) - Au, Cu; (Minor) - Ag
Development Status: None
Deposit Model: Porphyry Cu-Au? (Cox and Singer, 1986; model 20c?)

Other Databases

Link to USGS - Alaska:	TK036

Other Regions, Features and Areas containing this locality

References