Fish

Prospect, Active

Commodities and mineralogy

Main commodities Ag; Cu; Pb; Zn
Ore minerals chalcopyrite; galena; smithsonite; sphalerite
Gangue minerals carbonate; quartz

Geographic location

Quadrangle map, 1:250,000-scale EA
Quadrangle map, 1:63,360-scale B-4
Latitude 64.2546
Longitude -142.7058
Nearby scientific data Find additional scientific data near this location
Location and accuracy The Fish prospect is about 0.6 mile northwest of hill 4280 near the center of the southern boundary of the Eagle B-4 quadrangle. The coordinates are the location of a quartz-carbonate vein and gossan zone at the headwaters of Texas Creek in the northeast quarter of section 1, T. 8 S., R. 25 E.. Texas Creek, a small tributary of Fish Creek, is not labeled on the U.S. Geological Survey topographic map of the Eagle B-4 quadrangle (1956); its mouth is in the northeast quarter of section 24, T. 7 S., R. 25 E. The location is accurate.

Geologic setting

Geologic description

In upper Fish Creek, Paleozoic metasedimentary and metavolcanic rocks are intruded by Mesozoic to early Tertiary(?) biotite-hornblende quartz monzonite and granodiorite stocks (Dashevsky and others, 1986). Hornfelsed metamorphic rocks are common near the contact of a quartz monzonite pluton. The Fish prospect consists of quartz-carbonate veins and a gossan zone in the headwaters of Texas Creek (see EA061). Mineralization in one drainage appears to be associated with a 5- to 10-foot-wide gossan zone along a north-trending fault zone at a contact of granodiorite and metasedimentary rock. Gossan samples from the fault zone contain 8 to 24 percent zinc, as much as 2,000 parts per million (ppm) lead, and as much as 200 ppm copper. Samples of gossan and silicified zones contained more than 3 percent zinc, and up to 6,424 ppm lead and 12 ppm silver (U.S. Bureau of Mines, 1995). Five VLF lines run at right angles to the trend of the fault zone showed 'crossovers' probably related to the fault. The geology in the prospect area is considered permissive for skarn, structurally controlled, or stratabound deposits (Dashevsky and others, 1986). There has been placer gold prospecting on Fish Creek (EA059) and Texas Creek (EA061) to the north and west of this prospect.
Sulfides in the area were first noted by Foster (1976). Reconnaissance stream-sediment sampling was done in the upper Fish Creek drainage in 1976 by WGM Inc. (Dashevsky and others, 1986). Initial reconnaissance sampling detected elevated zinc and lead in stream sediments in several tributaries to Fish Creek. In 1977, WGM Inc. conducted reconnaissance mapping, sampled soils and rocks, and filled in the stream-sediment sampling grid. traverses and soil and rock sampling, and fill-in stream sediment sampling. In 1981, Arctic Resources Inc. conducted ridge line traverses and ran a soil-sampling line across the north-south-trending fault zone. Soils with elevated lead and zinc were found west of the fault in hornfels and quartzite, but no mineralization was observed. In 1991, Central Alaska Gold Co. conducted rock sampling in the area; no gold was detected in any samples (WGM Inc., 1998 [DLR 98-10]). The U.S. Bureau of Mines briefly examined the Fish Creek area in 1994. Soil sampling and mapping by WGM Inc. in 2001 resulted in defining a steeply dipping metal-enriched shear zone that persistently extends for 4,800 feet across a high ridge crest to the edge of the soil grid. The zone is defined by anomalous zinc, lead, silver, copper, bismuth, arsenic, antimony, cadmium, and manganese. All the zinc values exceed 1,000 ppm for the entire 4,800 feet; zinc values exceed 5,000 ppm in 1,200 segments to each side of the ridge. Twenty-eight grab samples of rocks averaged 11.6 percent zinc, 0.13 percent lead, and 18.7 ppm silver. The mineralized zone is estimated to be 50 to 75 feet thick (Swainbank and others, 2002; Ventures Resource Corp., 2002).
Under an agreement with Doyon Ltd., Full Metal Minerals began work on the prospect in 2006 (Full Metal Minerals, 2006 [40 mile]). They described the mineralization as strongly oxidized massive sulfides up to 44 meters thick. They drilled a gossan 15 to 23 meters thick derived from intensely weathered massive to semi-massive sulfides. The zinc in the gossan occurs mainly as smithsonite. The gossan has been traced 1,500 meters along strike and 250 meters down dip. Through 2010, Full Metal has drilled 10 holes at Fish that total 1,629 meters (2007 Stevens, 2010). The mineralization remains open in depth and in both directions along strike. Some notable intercepts are: 1) 11 meters that averaged 205.2 grams of silver per tonne, 0.1 percent copper, 0.2 percent lead, and 4.2 percent zinc; 2) 12.9 meters that averaged 181.3 grams of silver per tonne, 0.1 percent copper, 0.4 percent lead, and 4.0 percent zinc; 3) 7.8 meters that averaged 114.8 grams of silver per tonne, 0.2 percent copper, 0.1 percent lead, and 2.7 percent zinc; 4) 8.2 meters that averaged 118.8 grams of silver per tonne, 0.1 percent copper, and 0.1 percent zinc; 5) 20.6 meters that averaged 52 grams of silver per tonne, 0.1 percent copper, 0.08 percent lead and 1.7 percent zinc; 6) 4.6 meters that averaged 46.7 grams of silver per tonne and 2.2 percent zinc; and 7) 2.1 meters that averaged 205 grams of silver per tonne and 0.3 percent zinc.
Geologic map unit (-142.708087615546, 64.2542574366416)
Mineral deposit model Silver-zinc-lead skarn (Cox and Singer, 1986; model 18c).
Mineral deposit model number 18c
Age of mineralization Mineralization probably related to nearby Mesozoic to early Tertiary(?) biotite-hornblende quartz monzonite and granodiorite stocks in the upper Fish Creek drainage (Dashevsky and others, 1986).

Production and reserves

Workings or exploration Sulfides in the area were first noted by Foster (1976). Reconnaissance stream-sediment sampling was done in the upper Fish Creek drainage in 1976 by WGM Inc. (Dashevsky and others, 1986). In 1981, Arctic Resources Inc. conducted ridge line traverses and ran a soil sampling line across the north-south-trending fault zone that crosses the prospect. In 1991, Central Alaska Gold Co. conducted rock sampling in the area; no gold was detected in any samples (WGM Inc., 1998 [DLR 98-10]). The U.S. Bureau of Mines briefly examined the Fish Creek area in 1994. WGM carried out soil sampling and mapping. Under an agreement with Doyon Ltd., Full Metal Minerals began work on the prospect in 2006. They drilled 7 holes in 2006 and 3 holes in 2008 (Stevens, 2010).
Indication of production None
Reserve estimates None.
Production notes None.

Additional comments

This prospect is located on 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).
Central Alaska Gold Co., 1992, Central Alaska Gold Co. annual report, Alaska field operations - Doyon option, volume 1: Doyon, Ltd. Report 92-70, 156 p. (Report held by Doyon, Ltd., Fairbanks, Alaska).
Central Alaska Gold Co., 1992, Central Alaska Gold Co. annual report, Alaska field operations plates 13-24, Wiseman north, Fortymile south, Fortymile central, Manley Hot Springs, volume 3: Doyon, Ltd. Report 92-72, 12 p. (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).
Full Metal Minerals, 2008 (40 mile): (http://www.fullmetalminerals.com/s/40mile.asp (as of March 4, 2008)..
Lessman, J., and Holm, B., 1978, 1977 annual progress report, Doyon Project, Champion-Lead Creek area: Doyon, Ltd. Report 78-02. (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).
Reporters M.B. Werdon; R.L. Flynn; and D.J. Szumigala (ADGGS); D.J. Grybeck (Contractor, USGS)
Last report date 4/1/2012