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

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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

Mineral List



3 entries listed. 2 valid minerals.

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References

Gehrels, G.E., and Berg, H.C., 1994, Geology of southeastern Alaska, in Plafker, George, and Berg, H. C., eds., The geology of Alaska: Geological Society of America, DNAG, The geology of North America, Vol. G-1, p. 451-467. Wells, D.E., Pittman, T.L., Brew, D.A. and Douglass, S.L., 1986, Map and description of the mineral deposits in the Juneau, Taku River, Atlin, and part of the Skagway quadrangles, Alaska: U.S. Geological Survey Open-File Report 85-717, 332 p., 1 sheet, scale 1:250,000.

 
Mineral and/or Locality  
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