|Quadrangle map, 1:250,000-scale||MH|
|Quadrangle map, 1:63,360-scale||B-2|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||This occurrence is at an elevation of about 7,100 feet, on the wall of the cirque at the head of Rock Candy Creek. It is about one-half mile northeast of the center of section 2, T. 19 S., R. 16 E., Fairbanks Meridian. The location is accurate.|
This occurrence is part of a northwest-trending set of structurally controlled sulfide veins and veinlets that are intermittently exposed for about 9 miles between the Robertson Glacier and the glacier at the head of the West Fork Robertson River. Coarse-grained pyrite, arsenopyrite, galena, sphalerite, and stibnite occur in a gangue of quartz and carbonate with patches of adularia (?). The veins crosscut both bedding and schistosity but are locally parallel to them. The host rocks in this area are siliceous metasedimentary rocks that include quartzite, quartz arenite, and siliceous siltstones (R.A. Blakestad and others, unpublished Resource Associates of Alaska, Inc. report, 1978).Samples contain as much as 25 percent lead, 17 percent zinc, 0.1 percent copper, 2 to 3 ounces of silver per ton, and 1.5 parts per million gold (R.A. Blakestad and others, unpublished Resource Associates of Alaska, Inc. report, 1976). Geologic mapping and geochemical sampling was done from 1976 to 1979; however, most of the work in this area was concentrated on similar veins nearby, such as the RC East prospect (MH255).
|Geologic map unit||(-144.615745109195, 63.3003171554393)|
|Mineral deposit model||Polymetallic veins (Cox and Singer, 1986; model 22c).|
|Mineral deposit model number||22c|
|Age of mineralization||Devonian or younger, on the basis of the age of the host rock, which is in the Jarvis Creek Glacier subterrane (Nokleberg and others, 1992).|
|Workings or exploration||Geologic mapping and geochemical sampling was done from 1976 to 1979; however, most of the work in this area was concentrated on similar deposits nearby.|
|Indication of production||None|
Additional commentsUnpublished data cited is available for viewing by contacting Grayd Resources Inc. in Vancouver, B. C., Canada (www.grayd.com), or Northern Associates Inc. in Fairbanks, Alaska.
Nokleberg, W.J., Aleinikoff, J.N., Lange, I.M., Silva, S.R., Miyaoka, R.T., Schwab, C.E., Zehner, R.E., Bond, G.C., Richter, D.H., Smith, T.E., and Stout, J.H., 1992, Preliminary geologic map of the Mount Hayes quadrangle, eastern Alaska Range, Alaska: U.S. Geological Survey Open-File Report 92-594, 39 p., 1 sheet, scale 1:250,000.
|Reporters||W.T. Ellis (Alaska Earth Sciences) and A.W. Wyatt and S.S. Dashevsky (Northern Associates Inc.)|
|Last report date||3/20/2003|