Unnamed Occurrence (ARDF - JU251; west end of 'Mariposite Ridge'), Admiralty Mining District, Juneau, Alaska, USAi

Regional Level Types
Unnamed Occurrence (ARDF - JU251; west end of 'Mariposite Ridge')	- not defined -
Admiralty Mining District	Mining District
Juneau	City Borough
Alaska	State
USA	Country

Location: This occurrence is at an elevation of approximately 2,800 feet on the west end of a feature locally called Mariposite Ridge. It is 3 miles southeast of Hawk Inlet docks and transfer facility, 5 miles west of Eagle Peak, and 2 miles northwest of the Greens Creek Mine (JU253), in the NW1/4SE1/4 section 31, T. 43 S., R. 66 E. of the Copper River Meridian. The location is accurate within 1/8 mile. The occurrence may be at the west edge of the Mammoth prospect (JU248).
Geology: Wells and others (1986) describe this occurrence as quartz veins in a shear zone in mariposite-bearing dolomite. Nearby metavolcanic rocks are also sheared and veined with quartz. A sample of vein material collected in 1983 contained 0.73 percent lead, 0.3 percent zinc and 0.25 ppm silver. A sample of quartz-rich metavolcanic rock contained 0.5 percent barite and traces of arsenic, silver and gold (Wells and others,1986). The rocks in the general area are mainly Ordovician and Devonian to Triassic, clastic units, mafic-intermediate volcanic rocks, and subordinate limestone. The bedded rocks are intruded and locally metamorphosed by Cretaceous granodiorite (Gehrels and Berg, 1994).
Workings: Surface sampling only.

Commodities (Major) - Ag, Au, Pb, Zn; (Minor) - Ba
Development Status: No

Other Databases

Link to USGS - Alaska:	JU251

Other Regions, Features and Areas containing this locality

References