CC South

Occurrence, Active

Commodities and mineralogy

Main commodities Zn
Other commodities Ag; Au; Cu; Pb
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 A-1
Latitude 63.1963
Longitude -144.031
Nearby scientific data Find additional scientific data near this location
Location and accuracy The CC South occurrence is at an elevation of about 5,200 feet, a mile south of peak 6740 near the center of section 2, T. 16 N., R. 7 E., Copper River Meridian. The location is accurate.

Geologic setting

Geologic description

The CC South occurrence is in felsic metavolcanic rocks of the Drum unit. It follows a 100-foot-thick section of strongly altered and variably mineralized felsic volcanic rocks that can be traced by iron staining and anomalous soil chemistry for 2,000 feet in an east-west direction before being covered by talus. Semimassive sulfides are locally as much as a few inches thick; disseminated sulfide occurrences with as much as 5 percent pyrite are common. The nearest exposure of the Drum mineralized layer or bed is a mile northwest at the CC Barite occurrence (MH348), where bedded barite and anomalous base metals were discovered (E. Hunter, unpublished data, 1998).
Soil samples along the CC South deposit have varied contents of base and precious metal. Samples contain as much as 701 parts per million (ppm) copper, 3,040 ppm lead, 1,400 ppm zinc, 6.6 ppm silver, and 405 parts per billion (ppb) gold. A float sample of semimassive sulfide within the area of the soil anomaly contained 115 ppm copper, 775 ppm lead, 3.7 percent zinc, 4.0 ppm silver, and 70 ppb gold (E. Hunter, unpublished data, 1998).
The Drum metavolcanic rocks that host this deposit are composed of white to pale gray-green, rusty weathering, quartz-eye-bearing quartz-sericite(-chlorite-pyrite) schist with minor gray to black carbonaceous phyllite and rare interbeds of chloritic phyllite. The protoliths of the schist are about two-thirds volcanic rocks of rhyodacite and dacite composition and one-third sedimentary rocks. A phyllitic parting is present in the schist in many places (Dashevsky and others, 2003).
Geologic map unit (-144.033246024674, 63.1959235625606)
Mineral deposit model Kuroko massive sulfide (Cox and Singer, 1986; model 28a).
Mineral deposit model number 28a
Age of mineralization The enclosing Drum unit has been dated at the Devonian-Mississippian boundary on the basis of one SHRIMP U-Pb zircon age of 359 +/- 6 Ma determined at the DD South prospect (MH325) (Dashevsky and others, 2003).

Production and reserves

Workings or exploration Only surface sampling and prospecting has been done at this occurrence.
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