Unnamed (near the mouth of Rock Candy Creek)

Occurrence, Inactive

Commodities and mineralogy

Main commodities Cu; Pb; Zn
Other commodities Ag
Ore minerals chalcopyrite; galena; pyrite; sphalerite
Gangue minerals chlorite; quartz; sericite

Geographic location

Quadrangle map, 1:250,000-scale MH
Quadrangle map, 1:63,360-scale B-2
Latitude 63.3233
Longitude -144.6956
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is located on the moraine of the glacier at the head of the West Fork Robertson River and is about one-third mile northwest of the mouth of Rock Candy Creek. It is at an elevation of about 3,500 feet in the SW1/4 section 28, T. 18 S., R. 16 E., Fairbanks Meridian. The location is accurate.

Geologic setting

Geologic description

Float of massive and banded-sulfide boulders was found on the moraine of the glacier at the head of the West Fork Robertson River northeast of the mouth of Rock Candy Creek. No details are given other than that a similarity is noted to mineralization at a nearby unnamed occurrence (MH244) (R.A. Blakestad and others, unpublished Resource Associates of Alaska, Inc. report, 1976).
This occurrence is in the Jarvis Creek Glacier subterrane of Devonian age (Nokleberg and others, 1992). This subterrane consists of a complex sequence of volcaniclastic metasedimentary rocks, predominantly of intermediate composition. The unit includes felsic and mafic metavolcanic units and metasedimentary rocks, including calcareous schist, dolomite, limestone, siltstone, quartzite, and black carbonaceous schist. The rock units are typically thin bedded, strike northwest, and dip moderately southwest. The schistosity and folds are generally parallel to the regional strike but with local exceptions (R.A. Blakestad and others, unpublished Resource Associates of Alaska, Inc. report, 1976). The metamorphosed volcanic and sedimentary rocks have been intruded by several gabbro and mafic sills and dikes and plutons of felsic to intermediate composition (R.A. Blakestad and others, unpublished Resource Associates of Alaska, Inc. report, 1976).
Geologic map unit (-144.69784566031, 63.3229164595959)
Mineral deposit model Kuroko massive sulfide (Cox and Singer, 1986; model 28a).
Mineral deposit model number 28a
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).

Production and reserves

Workings or exploration This occurrence has only had limited surface sampling. Follow-up work focused on discoveries of additional mineralization (MH244 and MH249) (Rodney A. Blakestad and others, unpublished Resource Associates of Alaska, Inc. report, 1976).
Indication of production None

Additional comments

Unpublished 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.

References