Goldberg

Prospect, Active

Commodities and mineralogy

Main commodities As; Au; Sb
Other commodities Bi; Cu; Pb; Te; Zn
Ore minerals gold
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale TC
Quadrangle map, 1:63,360-scale A-6
Latitude 63.1755
Longitude -143.8203
Nearby scientific data Find additional scientific data near this location
Location and accuracy The Goldberg prospect is about 4.2 miles northwest of the junction of the Tok River and Dry Tok Creek. It is about 3.7 miles east of VABM 7302 'White' and about 0.6 mile south-southwest of the center of section 12, T. 16 N., R. 8 E. The location is accurate.

Geologic setting

Geologic description

The rocks in the area are part of the Tok Schist and consists mainly of quartz-muscovite schist with a thick layer of quartz-chlorite schist (Rhyolite Resources Inc., 2012 [February 18]). The Tok Schist is cut by several steep to vertical faults, one of which control the trend of the mineralization at the nearby Shalosky prospect (TC New042). To the north across a north-dipping thrust fault, the rocks are a folded sequence of argillaceous sediments, felsic-sulphidic schist, chlorite schist, feldspar-quartz schist, banded sedimentary rocks, and gabbro. The age of the rocks is uncertain; Foster (1970) only indicates that they are Paleozoic or Mesozoic.
The mineralization in the area is sediment hosted and controlled by structure; it is associated with zones of silicification and quartz-vein stockwork (Rhyolite Resources Inc., 2012 [February 23]). (Unstated) sulfides vary from 1 to more than 20 percent of the mineralization. There is a strong geochemical association of the gold with arsenic and antimony; copper, lead, zinc, bismuth, tellurium, and silver are low.
From 1998 through 2001, Grayd Resources and Placer Dome Inc. explored the area (Rhyolite Resources Inc., 2012 [February 18]; 2012 [February 23]). They collected many rock and geochemical samples, trenched, and drilled 12 holes in the area totaling 1,174 meters but the data are not publicly available. They examined and sampled the Goldberg prospect and they may have discovered it; they also drilled at least two holes on it.
In 2009, Rhyolite Resources acquired a large block of claims that covered the prospect and they identified the Goldberg as a distinct prospect. Through 2011, Rhyolite had not drilled the deposit but it is likely that they examined if not sampled the prospect. They note that one 'PD' (Placer Dome?) drill hole had a 1.2-meter intercept that contained 3.8 grams of gold per tonne and another drill hole had a 13-meter intercept that contained 1.2 grams of gold per tonne. The Goldberg prospect is probably similar to several other gold prospects in the area, the best known of which the Shalosky prospect (TC042).
Geologic map unit (-143.822537805227, 63.1751288691558)
Mineral deposit model Gold-quartz in veins and brecciated zones; lower grade disseminated mineralization. (Cox and Singer, 1986; model 22c?).
Mineral deposit model number 22c?
Age of mineralization Unknown other than that it is younger than the Paleozoic or Mesozoic host rocks.
Alteration of deposit Not noted.

Production and reserves

Workings or exploration From 1998 through 2001, Grayd Resources and Placer Dome Inc. explored the area (Rhyolite Resources Inc., 2012 [February 18]; 2012 [February 23]. They collected many rock and geochemical samples, trenched, and and drilled 12 holes in the area 1,174 meters but the data are not publicly available. They examined and sampled the Goldberg prospect and they may have discovered it; they also apparently drilled at least two holes on it. In 2009, Rhyolite Resources acquired a large block of claims that covered the prospect and they identified the Goldberg as a distinct prospect. Through 2011, Rhyolite had not drilled the deposit but it is likely that they examined if not sampled the prospect.
Indication of production None
Reserve estimates None.
Production notes None.

References

References

Rhyolite Resources Ltd. 2012, (Corporate Presentation): http://www.rhyoliteresources.com/in/pdf/CorporatePresentation.pdf (as of February 18, 2012).
Rhyolite Resources Ltd., 2012, Projects overview: http://www.rhyoliteresources.com/s/Projects.asp (as of February 23, 2012).
Reporters D.J. Grybeck (Contractor, USGS)
Last report date 4/1/2012