Indiana

Prospect, Active

Commodities and mineralogy

Main commodities Au
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale JU
Quadrangle map, 1:63,360-scale D-4
Latitude 58.8476
Longitude -135.0494
Nearby scientific data Find additional scientific data near this location
Location and accuracy The Indiana prospect is on the west side of upper Johnson Creek at an elevation of approximately 800 feet. It is 1/3rd of a mile north of the Jualin Mine (JU044), 2 miles south of Lions Head Mountain, and 4.5 miles north of Berners Bay. It is in the SE1/4 section 10, T. 35 S., R. 62 E. of the Copper River Meridian. The location is accurate.

Geologic setting

Geologic description

Note: Beginning in the 1990s, this and other old mines and prospects in the vicinity were consolidated by Coeur-Alaska into a single property (Birak, 2006). They have carried out major new drilling and underground exploration that better defines the mineralization, largely blurs the geologic distinction among the old deposits, and extends the ore bodies greatly. They have developed a coherent modern interpretation of the mineralization as a single deposit which Coeur-Alaska intends to mine as a unit. This deposit is described separately in ARDF as the Jualin (Coeur-Alaska) deposit (JU262). For geologic reference purposes and for their historic value, the pre-Coeur-Alaska data for this and the other old mines and prospects that Coeur-Alaska consolidated are retained in ARDF.
The Indiana prospect was worked from 1896 to 1901 and was developed to intersect the northern extension of the Jualin (JU044) vein system. But the northern extension of the Jualin system deflects from northerly to northwesterly and the Indiana tunnels failed to reach it. The workings consist of a 1,600-foot adit, a 900-foot adit, and a 400-foot adit. A 10-stamp mill was also installed but not used at this site (Redman and others, 1989). The workings reportedly intersected auriferous quartz veins and stockworks, but no production occurred (Poncin, 1940).
Geologic map unit (-135.051213357475, 58.8472721251822)
Mineral deposit model Low-sulfide Au-quartz vein (Cox and Singer, 1986; model 36a).
Mineral deposit model number 36a
Age of mineralization The age of mineralization in the Berners Bay district is about 55 Ma, the same as the other mesothermal gold-quartz-vein deposits in the Juneau Gold Belt (Goldfarb and others, 1997).

Production and reserves

Workings or exploration Workings driven from 1896 to 1901 consist of a 1600-foot adit, a 900-foot adit, and a 400-foot adit. A 10-stamp mill was installed but was apparently never put in operation (Redman and others, 1989).
Indication of production None

References

MRDS Number A012063

References

Birak, D.J., 2006, Kensington gold project: Unpublished Technical Report for Cour d'Alene Mines, 116 p. (posted on www/.sedar.com, April 20, 2006).
Goldfarb, R.J., Miller, L.D., Leach, D.L., and Snee, L.W, 1997, Gold deposits in metamorphic rocks in Alaska, in Goldfarb, R.J., and Miller, L.D., eds., Mineral Deposits of Alaska: Economic Geology Monograph 9, p. 151-190.
Miller, L.D., Goldfarb, R.J., Snee, L.W., Gent, C.A., and Kirkham, R.A., 1995, Structural geology, age, and mechanisms of gold vein formation at the Kensington and Jualin deposits, Berners Bay district, southeast Alaska: Economic Geology, v. 90, p. 343-368.
Poncin, E., 1940, Report on Jualin concessions of Alaska Goldfields Corporation, Region of Berners Bay, Alaska: Unpublished report [translated from French], 1940, 65 p.
Reporters J.C. Barnett and L.D. Miller (Juneau, Alaska ); D.J. Grybeck (Port Ludlow, WA)
Last report date 6/5/2008