|Quadrangle map, 1:250,000-scale||TC|
|Quadrangle map, 1:63,360-scale||A-6|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||The HDS prospect is about 6.5 miles west-northwest of the junction of the Tok and Dry Tok Rivers. It is about 1.6 miles east-northwest of VABM 7302 'White' near the southwest corner of section 10, T. 16 N., R. 8 E. The location is accurate.|
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 (TC042). 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. It is likely they examined and sampled the HDS prospect. There is mention of a 1997 drill hole of unknown provenance.In 2009, Rhyolite Resources acquired a large block of claims that covered the prospect and they show the HDS as a distinct prospect within the area they have mapped and sampled. Through 2011, Rhyolite had not drilled the HDS prospect but they mapped and sampled it. The mineralization at the HDS is unlike most of the other prospects in the area. A sample of massive-sulfide float contained 1.4 percent copper, 13.5 percent lead, and 13.8 percent zinc. They also note an intercept 0.2 foot long in a 1997 drill hole with 4.4 percent lead and 3.2 percent zinc.
|Geologic map unit||(-143.890340492777, 63.1744267434937)|
|Mineral deposit model||Volcanogenic copper-lead-zinc massive sulfide?|
|Age of mineralization||Unknown other than that it is younger than the Paleozoic or Mesozoic host rocks.|
|Alteration of deposit||Not noted.|
|Workings or exploration||From 1998 through 2001, Grayd Resources and Placer Dome Inc. explored in 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. It is likely that they discovered the HDS prospect and sampled it. In 2009, Rhyolite Resources acquired a large block of claims that covered the prospect and they show the HDS as a distinct prospect within the area they have mapped and sampled. There is mention of a 1997 hole drilled by an unknown party.|
|Indication of production||None|
Foster, H.L., 1970, Reconnaissance geologic map of the Tanacross quadrangle, Alaska: U.S. Geological Survey Miscellaneous Geological Investigations Map I-593, 1 sheet, scale 1:250,000.
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|