East Lake

Prospects, Active

Commodities and mineralogy

Main commodities Ag; Au; Zn
Ore minerals sphalerite
Gangue minerals barite

Geographic location

Quadrangle map, 1:250,000-scale PE
Quadrangle map, 1:63,360-scale C-4
Latitude 56.5587
Longitude -133.0245
Nearby scientific data Find additional scientific data near this location
Location and accuracy This record includes several prospects scattered in a heavily forested area somewhat larger than 1,000 feet in diameter, centered about 0.5 mile east of the east end of Harvey Lake. The center of the area is about 0.5 miles west-northwest of the center of section 25, T 61 S, R. 79 E. Still and others (2002, figure 18) show the location of 9 holes drilled in 1999 and the location of the several samples they collected.

Geologic setting

Geologic description

At various times from the 1970s to the present, much of central Woewodski Island was staked by a succession of companies; these include Resource Associates of Alaska, Cominco Exploration, Colony Pacific, Amselco, Kennecott Exploration, Houston Oil and Minerals, Westmin Resources, and the Olympic Resources Group. During the late 1980s and early 1990, there was considerable geochemical sampling in this area and a hole was drilled sometime before 1998 that was reported to intersect notable zinc values. (Still and others, 2002). In 1999, P. Beardslee of Petersburg drilled 9 shallow holes in the area that intersected thin bands of massive pyrite. Still and others (2002) found several outcrops in the thick forest that covers the area. One outcrop of iron-stained schist with 10 percent disseminated and banded pyrite did not contain significant metal values. However a sample nearby with 0.4 feet of massive pyrite exposed in a small landslide contained 1,023 parts per million zinc. Brew (1997) correlates the country rock in this area with the Triassic Hyd Group which typically consists of felsic and intermediate flows and breccia, argillite, and minor limestone in the Duncan Canal area.
In 2007, Bravo Ventures Group (2008) drilled two holes that totaled 432.6 meters; the holes were sited on anomalies that were defined with detailed gravity and 3D IP, ground geophysical surveys. The holes intersected several intervals of semi-massive pyrite and fine grained black to gray argillite. Both holes intersected intervals at least 16 meters thick with more than 1 parts per million silver, more than 0.1 percent zinc, and notable but discontinuous gold and barium values.
Geologic map unit (-133.026220449409, 56.558352881456)
Mineral deposit model Kuroko massive sulfides.
Age of mineralization Triassic or younger based on age of the host rock.
Alteration of deposit None noted specifically.

Production and reserves

Workings or exploration At various times from the 1970s to the present, much of central Woewodski Island was staked by a succession of companies; these include Resource Associates of Alaska, Cominco Exploration, Colony Pacific, Amselco, Kennecott Exploration, Houston Oil and Minerals, Westmin Resources, and the Olympic Resources Group. During the late 1980s and early 1990, there was considerable geochemical sampling in this area and a hole was drilled sometime before 1998 that was reported to intersect notable zinc values. (Still and others, 2002). In 1999, P. Beardslee of Petersburg drilled 9 shallow holes in the area that intersected thin bands of massive pyrite. Still and others (2002) found several outcrops in the thick forest that covers the area and sampled them. In 2007, Bravo Ventures Group (2008) drilled two holes that totaled 432.6 meters; the holes were sited on anomalies that were defined with detailed gravity and 3D IP, ground geophysical surveys.
Indication of production None

Additional comments

Area covered by active claims in 2008.

References

References

Bravo Venture Group, 2008, Woewodski program update: http://www.bravoventuregroup.com/en/index.php?page=news&newsid=109 (as of March 17, 2008).
Still, J.C., Bittenbender, P.E., Bean, K.W., and Gensler, E.G., 2002, Mineral assessment of the Stikine area, central Southeast Alaska: U.S. Bureau of Land Management Technical Report 51, 560 p.
Reporters H. C. Berg (Fullerton, California); D.J. Grybeck (Port Ludlow, WA)
Last report date 6/5/2008