Oscar

Prospect, Active?

Commodities and mineralogy

Main commodities Ag; Au; Cu; Pb; Zn
Ore minerals chalcopyrite; galena; magnetite; pyrrhotite; sphalerite
Gangue minerals calc-silicate minerals

Geographic location

Quadrangle map, 1:250,000-scale EA
Quadrangle map, 1:63,360-scale A-5
Latitude 64.2279
Longitude -143.1174
Nearby scientific data Find additional scientific data near this location
Location and accuracy The Oscar prospect covers about 5 square miles on the ridge west of Gold Bottom Creek. The coordinates are the approximate center of the prospect about 4 miles northwest of Mount Veta in the northeast quarter of section 14, T. 8 S., R. 23 E. The location is accurate.

Geologic setting

Geologic description

The Oscar prospect is at the contact between the Jurassic Mount Veta syenite and Paleozoic marble, calcareous schist, and quartzite (WGM Inc., 1998 [DLR 98-10]). Hypabyssal Tertiary felsic intrusions and volcanic rocks and Tertiary or Mesozoic quartz-monzonite plutons are also present. The relation of these younger intrusions to the Oscar prospect is not known. Ten outcrops of skarn occur at the prospect, but vegetation cover is extensive (WGM Inc., 2000 [Veta property summary]; WGM Inc., 1998 [DLR 98-10]). Ground magnetometer surveys indicate that several skarns are connected in the shallow subsurface and blind extensions continue beneath tundra cover.
Magnetite, pyrrhotite, galena, sphalerite, and chalcopyrite occur in calc-silicate rocks and hornfels (Dashevsky and others, 1986). Average grades are generally less than 11 percent combined lead and zinc, and as much as 3 ounces of silver per ton. A massive chalcopyrite-pyrrhotite boulder in rubble contained 18.8 percent copper and 18 ounces of silver per ton. A trench over a ground-magnetic anomaly revealed iron-stained and geochemically anomalous soils that contain as much as 3.8 percent lead, 10 ounces of silver per ton, 0.4 percent copper, 0.9 percent zinc, and 860 ppb gold. Rock samples collected in 1990 contain as much as 2,040 parts per billion (ppb) gold, 192 parts per million (ppm) silver, 9,134 ppm lead, greater than 1 percent copper, and greater than 1 percent zinc (WGM Inc., 1998 [DLR 98-10]). Four northeast-trending soil anomalies are as much as 2,000 feet long; they contain from 30 to greater than 7,000 ppb gold, 1 to 30 ppm silver, 100 to greater than 10,000 ppm copper, and 10,000 ppm or more zinc (WGM Inc., 2000 [Veta property summary]). Molybdenum- and silver-bearing calc-silicate inclusions in quartz monzonite occur across Gold Bottom Creek, east of the Oscar prospect skarns.
Bear Creek Mining Co. discovered the Oscar prospect in 1971; they conducted soil and rock sampling and a ground magnetic survey (Dashevsky and others, 1986). In 1975, WGM Inc. did stream sediment reconnaissance in the area; 1976 work by WGM Inc. included stream sediment sampling, reconnaissance geologic mapping, rock sampling, trenching, and soil sampling on a grid. In 1981, Arctic Resources Inc. extended the soil grid, and in 1982, Doyon, Ltd. traversed outlying ridges and slopes, sampled soils on a grid over a blind skarn, and conducted a ground magnetometer survey. In 1990, Central Alaska Gold Co. did geologic mapping and rock, soil, and stream-sediment sampling (WGM Inc., 1998 [DLR 98-10]). Work by WGM Inc. in 2001 was restricted to stream-sediment sampling near the peripheries of the prospect.
As of early 2012, the Oscar prospect was being explored by Heavy Metal Zinc under a lease agreement with Doyon, Ltd. (Heavy Metal Zinc, 2012). They consider the deposit to be in skarn bodies in marble adjacent to a syenite stock. The deposit is roughly zoned with magnetite-chalcopyrite bodies near the syenite and galena-sphalerite bodies further away. There are only two outcrops. Thirty-eight samples from the lower outcrop contained from a trace to 3.8 percent copper and a trace to 356 grams of silver per tonne. Sixty-two samples from the upper outcrop contained from a trace to 1.0 percent copper, a trace to 34.1 grams of silver per ton, and up to 1.2 percent zinc. Samples from prospect pits contained up to 17 percent copper, 5.2 percent zinc, 4.4 percent lead, and 444 grams of silver per tonne. Full Metal drilled one hole in 2010 but it did not intersect any significant mineralization (Stevens, 2010).
Geologic map unit (-143.119687340999, 64.2275504154324)
Mineral deposit model Cu skarn or Zn-Pb skarn (Cox and Singer, 1986; models 18b or 18c).
Mineral deposit model number 18b or 18c
Age of mineralization Skarn mineralization is at the contact of the Jurassic, Mount Veta syenite.
Alteration of deposit Mineralization is associated with skarn bodies.

Production and reserves

Workings or exploration Bear Creek Mining Co. discovered the Oscar prospect in 1971; they conducted soil and rock sampling and a ground magnetic survey (Dashevsky and others, 1986). In 1975, WGM Inc. did stream-sediment reconnaissance in the area; 1976 work by WGM Inc. included stream-sediment sampling, reconnaissance geologic mapping, rock sampling, trenching, and soil sampling on a grid. In 1981, Arctic Resources Inc. extended the soil grid, and in 1982, Doyon, Ltd. traversed outlying ridges and slopes, sampled soils on a grid over a blind skarn, and conducted a ground magnetometer survey. In 1990, Central Alaska Gold Co. did geologic mapping and rock, soil, and stream-sediment sampling (WGM Inc., 1998 [DLR 98-10]). Work by WGM Inc. in 2001 was restricted to stream-sediment sampling near the peripheries of the prospect (Ventures Resources, 2002). Beginning in 2006, the Oscar deposit was being explored by Full Metal Minerals and its successor Full Metal Zinc under a lease agreement with Doyon Ltd. Their work to early 2010 consisted mainly of sampling outcrops and hand-dug pits. They drilled one hole in 2010 that did not intersect any significant mineralization.
Indication of production None
Reserve estimates None.
Production notes None.

Additional comments

The Oscar prospect is within Doyon, Ltd. selected or conveyed land. For more information contact Doyon, Ltd., Fairbanks, Alaska.

References

References

Carter, C.H., 1981, Doyon exploration program, Blocks 4, 5, 8, and 22: Doyon, Ltd. Report 81-27. (Report held by Doyon, Ltd., Fairbanks, Alaska).
Dashevsky, S.S., 1983, Doyon exploration program, Block 8 - Fortymile, 1982: Doyon, Ltd. Report 83-01. (Report held by Doyon, Ltd., Fairbanks, Alaska).
Dashevsky, S.S., Nicol, D.L., and Bond, J., 1986, Mines, prospects, and geochemical anomalies on Doyon Limited regional overselection lands, Alaska, Blocks 1-8: Doyon, Ltd. Report 86-01a, 300 p. (Report held by Doyon, Ltd., Fairbanks, Alaska).
DiMarchi, J.J., Weglarz, T.B., Dickey, C.F., Laux, D.P., Smith, M.T., Toro, J., and Kurtz, J.P., 1991, Central Alaska Gold Co. 1990 annual report, Alaska field operations - Doyon option volume 10: Doyon, Ltd. Report 91-8g. (Report held by Doyon, Ltd., Fairbanks, Alaska).
DiMarchi, J.J., Weglarz, T.B., Dickey, C.F., Laux, D.P., Smith, M.T., Toro, J., and Kurtz, J.P., 1991, Central Alaska Gold Co. 1990 annual report, Alaska field operations - Doyon option volume 1: Doyon, Ltd. Report 91-8a. (Report held by Doyon, Ltd., Fairbanks, Alaska).
DiMarchi, J.J., Weglarz, T.B., Dickey, C.F., Laux, D.P., Smith, M.T., Toro, J., and Kurtz, J.P., 1991, Central Alaska Gold Co. 1990 annual report, Alaska field operations - Doyon option volume 2, analytical results, geochemical results part A: Doyon, Ltd. Report 91-8b. (Report held by Doyon, Ltd., Fairbanks, Alaska).
DiMarchi, J.J., Weglarz, T.B., Dickey, C.F., Laux, D.P., Smith, M.T., Toro, J., and Kurtz, J.P., 1991, Central Alaska Gold Co. 1990 annual report, Alaska field operations - Doyon option volume 2, analytical results, geochemical results part B: Doyon, Ltd. Report 91-8c. (Report held by Doyon, Ltd., Fairbanks, Alaska).
Heavy Metal Zinc, 2012, 40 Mile district target: http://fullmetalzinc.com/properties/ (as of March 4, 2012).
Lessman, J., and Holm, B., 1978, 1977 annual progress report, Doyon Project, Volume 8, Mt. Veta area: Doyon, Ltd. Report 78-05. (Report held by Doyon, Ltd., Fairbanks, Alaska).
Stevens, D.L., 2010, 40-Mile project, Fortymile Mining District, East-Central Alaska: Unpublished NI 43-101 report for Full Metal Zinc Ltd. and Full Metal Minerals Ltd., 177 p. (posted on www.sedar.com, April 21, 2011).
Ventures Resource Corp., 2002, 2001 Annual report: Ventures Resource Corporation, 32 p.
WGM Inc., 1977, Doyon Project, 1976 annual progress report, volume 1a, Blocks 1, 4, 5, 7, 8: Doyon, Ltd. Report 77-02a. (Report held by Doyon, Ltd., Fairbanks, Alaska).
WGM Inc., 1998, Veta property, 1997 annual report, volume 1: Doyon, Ltd. Report 98-10, 227 p. (Report held by Doyon, Ltd., Fairbanks, Alaska).
WGM Inc., 2000, Veta property summary, in Ventures Resource Alaska project overview and properties summary: Ventures Resource Corporation report.
Reporters D.J. Grybeck (Contractor, USGS)
Last report date 4/1/2012