Occurrence, Active

Commodities and mineralogy

Main commodities Ag; Au; Cu
Other commodities 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 B-5
Latitude 63.2651
Longitude -143.2192
Nearby scientific data Find additional scientific data near this location
Location and accuracy Eagle is a prospect about 3.5 miles north-northwest of the peak named 'Eagle' and about 19.7 miles northwest of the center of Tetlin Lake. The prospect is centered about 0.4 mile north-northwest of the center of section 12, T. 17 N., R. 11 E., of the Copper River Meridian. The location is accurate to within a mile.

Geologic setting

Geologic description

The Eagle prospect is part of the Tetlin Project, 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 on the project and are often associated with gold and copper mineralization in this terrane. Eagle is within a granitic rock unit (Freeman, 2014a).
The Eagle prospect is located within the Tintina Gold Belt (+200 million ounces of resource) and is prospective for mid-Cretaceous intrusive-related gold deposits. The area is also cut by a younger, northeast striking belt of porphyry copper–gold deposits, which have remained virtually unexplored since their discovery in the early 1970s (Freeman, 2014a).
Eagle exploration potential is characterized by multiple streams with visible gold or gold +/- copper anomalies (Freeman, 2014a).
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 In 2008, Contango ORE Inc. signed the lease with Tetlin Village, and began acquiring and analyzing remote sensing data in the area. Contango ORE, Inc. worked in the area of the Eagle prospect starting with surface geochemistry work and geophysics. In 2013, based on similar geology to the Peak Zone, pan concentrate stream sediment sampling and prospecting work were conducted (Van Treeck, C.J., Senior Geologist, Avalon Development Corp., written communication, 2014). The Eagle prospect contains multiple streams with visible gold or gold +/- copper anomalies (Freeman, 2014a).
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).



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