Unnamed Prospects (ARDF - GU010; south of Flat Creek), Chistochina Mining District, Valdez-Cordova Census Area, Alaska, USAi

Regional Level Types
Unnamed Prospects (ARDF - GU010; south of Flat Creek)	- not defined -
Chistochina Mining District	Mining District
Valdez-Cordova Census Area	Census Area
Alaska	State
USA	Country

Additional information can be obtained from Ahtna Minerals in Anchorage, Alaska.
Location: The site consists of several occurrences near an unnamed prospect (Cobb, 1979 [OFR 79-1247, p. 30] on the north side of the center part of the broad ridge between Cobb Lakes and Flat Creek. The broad ridge was called the Grizzly Hills by Kirk Stanley (written communication, 2000). The prospects are about 0.4 miles, south-southwest of a prospect mapped by Richter (1966, fig. 5). It is within a broad lead-zinc geochemical anomaly defined by Richter (1966) and a nearly coincident, gold geochemical anomaly defined by WGM Inc. (WGM Inc., 1980; anomaly 3a). The locality is approximately the same as number 11 of Richter and Matson (1972), and number 27 of MacKevett and Holloway (1977). The occurrences are in the NE1/4SE1/4, section 17, T. 11 N,. R. 7 E., Copper River Meridian.
Geology: The area consists mainly of the Grubstake, medium-grained quartz monzonite phase of the Pennsylvanian to Permian, Ahtell pluton and its quartz-rich border phase (Richter, 1966). The area has widespread mineralization. Richter (1966 fig. 5) mapped a prospect with a sulfide-bearing quartz-carbonate vein at an elevation of about 3,400 feet in the drainage north of the ridge. Rocks nearby contain disseminated chalcopyrite. WGM Inc. (WGM Inc., 1980) mapped a half-mile-long altered area containing sulfide veins centered on this location. Stream sediments in the drainage below Richter's prospect contained 700 ppb gold and the south-draining stream from the ridge contained 300 ppm tungsten. Kirk Stanley (written communication, 2000) reported the existence of tourmaline and silver-lead veins on the Grizzly Hills but without specifying an exact location.
Workings: The area has been explored intermittently by reconnaissance mapping, sampling, and minor bulldozer trenching since about 1963.
Age: Emplaced subseqent to or is related to the border phase of the Pennsylvanian to Permian, Ahtell pluton.
Alteration: Tourmaline.

Commodities (Major) - Cu; (Minor) - Au, Pb, W
Development Status: None
Deposit Model: Polymetallic vein (Cox and Singer, 1986; model 22c)

Other Databases

Link to USGS - Alaska:	GU010

Other Regions, Features and Areas containing this locality

References