TG North

Prospect, Active

Commodities and mineralogy

Main commodities Ag; Au; Pb; Zn
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale NL
Quadrangle map, 1:63,360-scale A-4
Latitude 64.1933
Longitude -157.5927
Nearby scientific data Find additional scientific data near this location
Location and accuracy The TG North prospect is about 3.1 miles west-northwest of VABM 1954 'Round Top', and about 0.3 mile north of the center of section 13, T. 15 S., R. 7 E. The location is accurate.

Geologic setting

Geologic description

The TG North prospect was discovered in 1980 by Anaconda Minerals as part of a regional exploration program that also found the nearby and better defined Round Top and Tim's Greisen prospects (NL011). They drilled four shallow 'Winkie' holes in late 1984, and covered it with geophysical and geochemical surveys. The prospect was being explored by the Western Alaska Copper and Gold Company in 2012 in conjunction with their work at the Round Top prospect.
As described by Western Alaska Copper and Gold (2012), the mineralization consists of gossan and vuggy, quartzite breccia along a north-trending linear. The host rock is brittle quartzite. Samples of from a prospect pit contained up to 5.7 percent lead and 1,203 grams of silver per tonne. Drill core shows evidence of many crosscutting fractures, replacement textures, and silicification. Western Alaska Copper and Gold suggests that the deposit may be Bonanza-style epigenetic silver-gold-lead-zinc mineralization in structurally controlled veins, breccia and replacement deposits.
Geologic map unit (-157.595145646457, 64.192651569276)
Mineral deposit model Bonanza-style epigenetic silver-gold-lead-zinc mineralization in structurally controlled veins, breccia and replacement deposits.
Age of mineralization Possibly related to the nearby Round Top prospect (NL011) which is probably Late Cretaceous or Early Tertiary based on a 74 Ma K/Ar date.
Alteration of deposit Silicification; abundant gossan.

Production and reserves

Workings or exploration The TG North prospect was discovered in 1980 by Anaconda Minerals as part of a regional exploration program that also found the nearby and better defined Round Top and Tim's Greisen prospects (NL011). They drilled four shallow 'Winkie' holes in late 1984, and covered the the prospect by geophysical and geochemical surveys. The prospect was being explored by the Western Alaska Copper and Gold Company in 2012.
Indication of production None
Reserve estimates None.
Production notes None.

References

References

Flanigan, B., 1998, Genesis and mineralization of ore deposits in the Illinois Creek region, west central Alaska: University of Alaska, Fairbanks, M.Sc. thesis, 125 p., 2 plates.
Harris, T.D., 1985, Geology of the Round Top porphyry copper-molybdenum deposit, west-central Alaska: Boulder, University of Colorado, M.Sc. thesis, 202 p.
Reporters D.J. Grybeck (Contractor, USGS)
Last report date 4/1/2012