Chisana

Prospect, Active

Commodities and mineralogy

Main commodities Ag; Au; Cu
Other commodities As; Bi; Co; Cd; Mo; Ni; Sb; Sn; Te; W; Zn
Ore minerals arsenopyrite; chalcopyrite; bismuth; galena; gold; pyrargyrite; pyrite; pyrrhotite
Gangue minerals amphiboles; calcite; chlorite

Geographic location

Quadrangle map, 1:250,000-scale TC
Quadrangle map, 1:63,360-scale A-4
Latitude 63.194
Longitude -142.5245
Nearby scientific data Find additional scientific data near this location
Location and accuracy Chisana is a prospect about 11.0 miles east of VABM 3345 'Tetlin' and about 10.4 miles northeast of the center of Tetlin Lake. The prospect is centered about 0.4 mile southwest of the center of section 2, T. 16 N., R. 15 E., of the Copper River Meridian. The location is accurate to within 500 feet.

Geologic setting

Geologic description

The Chisana prospect is part of the Tetlin Project (Freeman, 2014a), which is located in Precambrian to Paleozoic greenschist to amphibolite-grade metamorphic rocks of the Yukon-Tanana Terrane intruded by Cretaceous to Tertiary felsic and intermediate plutonic bodies (Foster, 1970). District and regional scale northeast and northwest trending faults are present in the project area and are often associated with gold and copper mineralization in this terrane (Freeman, 2014b). Chisana is within a biotite gneiss and schist unit. The project area is interpreted to be located in overlapping mineral belts of the Tintina gold belt with the Carmacks Porphyry Belt (Freeman, 2014a).
Chisana is characterized by a strong correlation between arsenic and gold in stream sediments and soil samples, multiple magnetic-conductivity highs, and visible gold in pans (Freeman, 2014a); this understanding was the result of surface work completed between 2010 and 2013. Results from this surface geochemistry have not been released (Van Treeck, C.J., Senior Geologist, Avalon Development Corp., written communication, 2014).
Geologic map unit (, )
Mineral deposit model Skarn? (Cox and Singer, 1986; model 18b).
Mineral deposit model number 18b?
Age of mineralization 70 million years old, Cretaceous, according to U/Pb radioisotope dating techniques, if similar age to Peak Zone prospect (Illig, 2014).
Alteration of deposit Chlorite and amphibole alteration is associated with gold and silver mineralization (Illig, 2014).

Production and reserves

Workings or exploration There has been no recorded past placer or lode mining or exploration drilling conducted on any prospect of the Tetlin Project until Contango Ore, Inc. completed its first reconnaissance exploration program in 2009 (Contango Ore, Inc., 2012). In 2010, the field program entailed prospecting, stream sediment sampling, and pan concentrate sampling, and focused basal soil sampling. In 2011, the basal soil sampling was continued (Van Treeck, 2013). Chisana is characterized by a strong correlation between arsenic and gold in stream sediments and soil samples, multiple magnetic-conductivity highs, and visible gold in pans (Freeman, 2014a); this understanding was the result of surface work completed between 2010 and 2013. Results from this surface geochemistry have not been released (Van Treeck, C.J., Senior Geologist, Avalon Development Corp., written communication, 2014).
Indication of production None

Additional comments

In 2008, Contango ORE, Inc. signed a lease with Tetlin Village to control mineral rights on about 675,000 acres of fee simple land leased from the Tetlin Village(Freeman, 2014b).

References

References

Reporters V.C. Zinno (Alaska Earth Sciences, Inc.)
Last report date 3/15/2016