RC Occurrence, Tok Mining District, Southeast Fairbanks Census Area, Alaska, USAi
Regional Level Types | |
---|---|
RC Occurrence | Occurrence |
Tok Mining District | Mining District |
Southeast Fairbanks Census Area | Census Area |
Alaska | State |
USA | Country |
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Latitude & Longitude (WGS84):
63° 17' 11'' North , 144° 39' 14'' West
Latitude & Longitude (decimal):
Type:
KΓΆppen climate type:
Mindat Locality ID:
199608
Long-form identifier:
mindat:1:2:199608:4
GUID (UUID V4):
d5c9d9da-8306-41db-a06e-9f5b6b09f07f
Unpublished data cited is available for viewing by contacting Grayd Resources Inc. in Vancouver, B. C., Canada (www.grayd.com), or Northern Associates Inc. in Fairbanks,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.
Location: The RC occurrence is at an elevation of about 7,000 feet, 3.4 miles north-northwest of Mount Kimball and south of the head of Rock Candy Creek. The occurrence is in the NW1/4NE1/4 section 10, T. 19 S., R. 16 E., Fairbanks Meridian.
Geology: The RC massive sulfide occurrence consists of pyrite bands with distinctive sphalerite-galena banding and chalcopyrite along fractures. The massive sulfide exposures vary from several inches to 5 feet in thickness. Outcrops are limited; extensive boulder trains of massive sulfides extend downslope and along the trend of the outcrop. Hydrothermal quartz-pyrite-arsenopyrite-stibnite veins locally cut blocks of massive sulfide float. Three veins crop out, each as much as 5 inches in thickness. They contain pyrite, arsenopyrite, galena, sphalerite, and stibnite. The gangue is quartz and carbonate with patches of adularia (?) in selvages as much as 2 inches thick. The veins generally crosscut both bedding and schistosity but are locally parallel to them. The average grade of the massive sulfide mineralization is 0.42 percent copper, 3.97 percent lead, 5.51 percent zinc, 57.2 parts per million silver, and traces of gold (Lange and others, 1993). Exploration of the massive sulfide mineralization soon focused on the higher grade polymetallic veins (J.K. Muntzert and others, unpublished Resource Associates of Alaska, Inc. report, 1977). The rocks in the area consist of a complex sequence of volcaniclastic sedimentary rocks, predominantly of intermediate composition. Felsic and mafic metavolcanic and metasedimentary rocks also occur; they include 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, with local exceptions (R.A. Blakestad and others, unpublished Resource Associates of Alaska, Inc. report, 1976).
Workings: Four core holes totaling 1,116 feet were drilled in 1977, 1978, and 1980 on the RC occurrence (S.S. Dashevsky, written communication, 2003). Exploration of the massive sulfide mineralization soon focused on the higher grade polymetallic veins (J.K. Muntzert and others, unpublished Resource Associates of Alaska, Inc. report, 1977).
Age: Devonian, on the basis of the age of the host rock, which is in the Jarvis Creek Glacier subterrane (Nokleberg and others, 1992).
Commodities (Major) - Ag, Cu, Pb, Zn
Development Status: None
Deposit Model: Polymetallic veins and Kuroko massive sulfide (Cox and Singer, 1986; model 22c,
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsCommodity List
This is a list of exploitable or exploited mineral commodities recorded at this locality.Mineral List
7 valid minerals.
Detailed Mineral List:
β Arsenopyrite Formula: FeAsS |
β Chalcopyrite Formula: CuFeS2 |
β Galena Formula: PbS |
β 'K Feldspar' ? |
β 'K Feldspar var. Adularia' ? Formula: KAlSi3O8 |
β Pyrite Formula: FeS2 |
β Quartz Formula: SiO2 |
β Sphalerite Formula: ZnS |
β Stibnite Formula: Sb2S3 |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
Group 2 - Sulphides and Sulfosalts | |||
---|---|---|---|
β | Sphalerite | 2.CB.05a | ZnS |
β | Chalcopyrite | 2.CB.10a | CuFeS2 |
β | Galena | 2.CD.10 | PbS |
β | Stibnite | 2.DB.05 | Sb2S3 |
β | Pyrite | 2.EB.05a | FeS2 |
β | Arsenopyrite | 2.EB.20 | FeAsS |
Group 4 - Oxides and Hydroxides | |||
β | Quartz | 4.DA.05 | SiO2 |
Unclassified | |||
β | 'K Feldspar var. Adularia' ? | - | KAlSi3O8 |
β | '' ? | - |
List of minerals for each chemical element
O | Oxygen | |
---|---|---|
O | β K Feldspar var. Adularia | KAlSi3O8 |
O | β Quartz | SiO2 |
Al | Aluminium | |
Al | β K Feldspar var. Adularia | KAlSi3O8 |
Si | Silicon | |
Si | β K Feldspar var. Adularia | KAlSi3O8 |
Si | β Quartz | SiO2 |
S | Sulfur | |
S | β Arsenopyrite | FeAsS |
S | β Chalcopyrite | CuFeS2 |
S | β Galena | PbS |
S | β Pyrite | FeS2 |
S | β Sphalerite | ZnS |
S | β Stibnite | Sb2S3 |
K | Potassium | |
K | β K Feldspar var. Adularia | KAlSi3O8 |
Fe | Iron | |
Fe | β Arsenopyrite | FeAsS |
Fe | β Chalcopyrite | CuFeS2 |
Fe | β Pyrite | FeS2 |
Cu | Copper | |
Cu | β Chalcopyrite | CuFeS2 |
Zn | Zinc | |
Zn | β Sphalerite | ZnS |
As | Arsenic | |
As | β Arsenopyrite | FeAsS |
Sb | Antimony | |
Sb | β Stibnite | Sb2S3 |
Pb | Lead | |
Pb | β Galena | PbS |
Other Databases
Link to USGS - Alaska: | MH254 |
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Other Regions, Features and Areas containing this locality
North America PlateTectonic Plate
- Windy-McKinley DomainDomain
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