Lone Jack Prospect (ARDF - CR079), Gold Mountain, Cleveland Peninsula, Ketchikan Mining District, Prince of Wales-Hyder Census Area, Alaska, USAi

Regional Level Types
Lone Jack Prospect (ARDF - CR079)	Prospect
Gold Mountain	Mountain
Cleveland Peninsula	Peninsula
Ketchikan Mining District	Mining District
Prince of Wales-Hyder Census Area	Census Area
Alaska	State
USA	Country

Location: The only description of the Lone Jack prospect is by Roehm (1936 [MR 191-3]). He indicates that the workings are southwest of the lower workings of the Gold Standard Mine (ARDF site KC028 in the Ketchikan quadrangle), about 2,100 feet from the shoreline, and between about 850 and 1,200 feet in elevation. This would place the prospect near the middle of the N1/2 section 12, T. 72 S. R. 87 E. The location probably is accurate.
Geology: As described by Roehm (1936 [MR 191-3]), two tunnels were driven on a mineralized structure that is exposed for about 600 feet, between 850 and 1,200 feet elevation. Quartz lenses occur along the structure, which has highly sheared walls. The hanging wall of the structure is greenschist; the footwall is greenstone. The quartz is mixed with numerous pieces of wall rock, and contains pyrite, calcite, and chlorite. The lower tunnel is 60 feet long and has a 10-foot crosscut. A small lens of quartz is exposed for half the length of the tunnel; the first 20 feet was reported to average about 0.25 ounce of gold per ton. The lens strikes N15E and dips 63E. The upper tunnel is 30 feet long and has an 8-foot crosscut. A flat-lying, 4-inch quartz vein is exposed that cuts other small quartz veins. The flat vein was reported to have good gold values; the other small veins were reported to average about 0.25 ounce of gold per ton. The wall rock of the veins is also mineralized. Apparently, there has been no other work on the property. The rocks in the area consist of metamorphosed andesite, basalt, agglomerate, and tuff, and minor flysch, shale, and phyllite. Eberlein and others (1983) and Brew (1996) consider them to be Paleozoic or Mesozoic in age; Gehrels and Berg (1992) tentatively mapped them as Jurassic or Cretaceous.
Workings: The prospect was explored by two tunnels, one 60 feet long and the other 30 feet long.
Age: The quartz veins cut country rocks that may be as young as Cretaceous or as old as Paleozoic.

Commodities (Major) - Au
Development Status: None
Deposit Model: Low-sulfide gold-quartz vein (Cox and Singer, 1986; model 36a).

Other Databases

Link to USGS - Alaska:	CR079

Other Regions, Features and Areas containing this locality

References