Matador

Prospect, Active

Commodities and mineralogy

Main commodities Ag; Au
Ore minerals arsenopyrite; gold
Gangue minerals carbonate minerals; quartz

Geographic location

Quadrangle map, 1:250,000-scale GU
Quadrangle map, 1:63,360-scale D-1
Latitude 62.9121
Longitude -144.0404
Nearby scientific data Find additional scientific data near this location
Location and accuracy The Matador prospect is about 14.0 miles north of Slana. It is about 3.9 miles northwest of VABM 6677 'Ahtell' in the northwest quarter of section 14, T. 3 S., R. 7 E., of the Copper River Meridian. The location is accurate within 1/4 mile.

Geologic setting

Geologic description

The rocks in the area of the Matador prospect are diorite and quartz diorite of the Permian to Pennsylvania, Ahtell pluton (Richter, 1966; Richter and others, 1975; Wilson and others, 1998; Myers and others, 2011; Corvus Gold Inc., 2012a). The rocks are cut by extensive dike swarms and faults. The mineralization is on the northeast side of a regional-scale northwest-striking fault.
The Matador prospect may have been sampled in 1980 when WGM Inc. on behalf of the Ahtna Native Corporation searched for the source of geochemical anomalies in gold that outlined a northwest-trending area several miles long WGM Inc. identified in 1979 (WGM Inc., 1979, 1980). In 1980, they collected several rock samples at scattered locations along the trend that contained up to 3,260 parts per billion (ppb) gold.
In 2010, Corvus Gold Inc. revisited the area, outlined an area of mineralization 2 by 9 kilometers in size, and called it the Golden Range target. They collected more than 300 rock and soil samples. The 151 rock samples averaged 0.6 gram of gold per tonne; 29 of the 151 had more than 0.10 gram of gold per tonne, and the best had 50.4 grams of gold per tonne (Corvus Gold Inc., 2011).
By 2011, Corvus had identified at least 5 specific prospects in the Golden Range target area that they had soil sampled, rock chip sampled, and drilled (Corvus Gold, Inc., 2012a). One is the Matador prospect where they drilled 2 holes. A notable intercept was 2.7 meters that averaged 0.02 gram of gold per tonne and 681.23 grams of silver per tonne.
The rock sample geochemistry has a signature of 5.3 to 1 ratio of silver to gold, 419 to 1 ratio of arsenic to antimony, 42 to 1 ratio of bismuth to tellurium, and 28 to 1 ratio of arsenic to copper (Brown and others, 2012).
No further details on the mineralization are available but it is probably similar to that at the nearby Notch prospect (GU045), where arsenopyrite-quartz veins are in a thick mineralized zone marked by sericitic and quartz-carbonate alteration (Myers and others, 2011).
Geologic map unit (-144.042610259296, 62.9117136244904)
Mineral deposit model Mineralized zone with arsenopyrite-quartz veins - polymetallic veins? (Cox and Singer, 1986; model 22c)
Mineral deposit model number 22c?
Age of mineralization Younger than the Permian to Pennsylvanian host rocks (Corvus Gold Inc., 2012a).
Alteration of deposit Extensive silica-carbonate alteration of diorite and quartz diorite? (Corvus Gold Inc., 2012a).

Production and reserves

Workings or exploration The Matador prospect may have been sampled in 1980 when WGM Inc. on behalf of the Ahtna Native Corporation searched for the source of geochemical anomalies in gold that outlined a northwest-trending area several miles long they had identified in 1979 (WGM Inc., 1979, 1980). In 2010, Corvus Gold Inc. revisited the area, outlined an area of mineralization 2 by 9 kilometers in size, and called it the Golden Range target. They collected more than 300 rocks and soil samples. By 2011, Corvus had identified at least 5 specific prospects in the Golden Range target area that they had sampled and drilled (Corvus Gold, Inc., 2012a). One is the Matador prospect where they drilled 2 holes. Highlights of intercepts are 2.7 meters averaging 681 grams of silver per tonne (Corvus Gold Inc., 2012b).
Indication of production None
Reserve estimates None.
Production notes None.

References

References

Corvus Gold Inc., 2012a, Chisna: http://www.corvusgold.com/projects/alaska/chisna/ (as of March 1, 2012).
Myers, Russell, Brown, Chris, Taylor Christ, Wilkins, Andres, Burnett, Bill, Stroup, Caleb, Keeley Josh, Benchley, Kristen, Robinson, John, Van Wyck Nick, and Jacobs, Joe, 2011, Golden Range- A new high grade gold discovery in Alaska: Alaska Miners Association, 2011 Annual Convention Abstracts, p. 37.
Richter, D.H., Lanphere, M.A., and Matson, N.A., Jr., 1975, Granite plutonism and metamorphism, eastern Alaska Range, Alaska: Geological Society of American Bulletin, v. 86, p. 819-820.
WGM Inc., 1979, 1978 Annual Progress Report, Uranium Exploration, Ahtell Creek Area, Volume I: WGM Inc., 39 p., appendices, 4 maps. (Report available, Ahtna Mineral Co., Anchorage, Alaska).
WGM Inc., 1980, 1979 Summary report of gold potential, Slana District, Ahtna project: WGM Inc., 10 p., map, scale 1:63,360. (Report held by Ahtna Mineral Co., Anchorage, Alaska).
Reporters D.J. Grybeck (Contractor, USGS); V.C. Zinno (Alaska Earth Sciences, Inc.)
Last report date 12/8/2014