|Quadrangle map, 1:250,000-scale||BM|
|Quadrangle map, 1:63,360-scale||B-4|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||The Frost prospect is along both sides of Frost Creek, an informally-named east-flowing branch of a northwest tributary of the Omar River. It is in sections 15, 16, and 22, T. 24 N., R. 9 W., of the Kateel River Meridian. The coordinates are at the approximate center of the prospect.|
The Frost prospect consists of discontinuous pods or lenses of barite in a zone 30 feet wide and 5,000 feet long. An iron-stained silicified zone surrounds the barite and is weakly mineralized. The silicified zone dips 25 to 45 degrees W and contains disseminated sphalerite and chalcopyrite, and sulfide-bearing quartz-calcite-barite veins. These veins trend N 70 E. Bedrock consists entirely of Devonian, light- to dark-gray limestone and medium- to coarse-grained, stratified dolomite and marble (Degenhart and others, 1978).
An 8-pound sample of barite assayed 96 percent BaSO4 and 0.5 percent zinc. A sample from an 8-foot-wide, quartz-calcite-barite-sulfide vein assayed 0.49 percent copper, 13.2 percent zinc, and 20.7 percent barium. This vein could only be traced for about 10 feet along strike before disappearing under talus (Degenhart and others, 1978).
The analytical results from three rock samples (Schmidt and Allegro, 1988) follow: 1) sample T, a limestone boulder with disseminated sulfides contains 110 parts per million (ppm) arsenic, greater than 100 ppm cadmium, 230 ppm antimony, greater than 2,000 ppm zinc, 1 ppm silver, 1,000 ppm barium, 500 ppm copper, and 3000 ppm lead; 2) sample V, a boulder with quartz, fluorite, sphalerite, galena, and bornite contained 40 ppm arsenic, greater than 100 ppm cadmium, 130 ppm antimony, greater than 2,000 ppm zinc. 0.7 ppm silver, greater than 5,000 ppm barium, 500 ppm copper, 200 ppm lead and 5,00 ppm strontium; 3) sample X, a boulder with vein galena and fine-grained pyrite and sphalerite contained 80 ppm arsenic, 70 ppm cadmium, 170 ppm antimony, greater than 2,000 ppm zinc, 5 ppm silver, 1,000 ppm barium, 700 ppm copper, 5 ppm molybdenum, and 7,000 ppm lead.In 2006, NovaGold began working in the region and staked a large block of claims that covered this and other similar prospects nearby (TintinaGold Resources Inc., 2010). In 2007, NovaGold carried out extensive field work in the area emphasizing geologic mapping and geochemical sampling. They describe the Frost prospect as a northwest-trending zone about 750 meters long and 200 meters wide of sparse outcrop and abundant rubble crop of barite-sulfide-fluorite mineralization. The sulfides are mainly sphalerite, galena, bornite, and chalcopyrite. Both stratabound and crosscutting mineralization is present. Selected rock samples contain up to 30.6 percent zinc, 20.2 percent copper, and 52.5 grams of silver per tonne.
|Geologic map unit||(-160.675567532424, 67.4797817525377)|
|Mineral deposit model||Kipushi Cu-Pb-Zn (Cox and Singer, 1986; model 32c).|
|Mineral deposit model number||32c|
|Age of mineralization||Devonian.|
|Alteration of deposit||Silicification.|
|Workings or exploration||The Frost deposit was discovered in 1963 by Bear Creek Exploration during a regional stream and soil sampling program. Exposure in the area is poor. An IP survey was done in 1965 (Walters, 1969). During an investigation of the prospect by the U.S. Bureau of Mines in 1978, over 140 soil, silt and rock samples were collected and analyzed (Degenhart and others, 1978). Detailed mapping and sampling were done by the U.S. Geological Survey in the late 1980s (Schmidt and Allegro, 1988; Zayatz and others, 1988). In 2006, NovaGold began working in the region and staked a large block of claims that covered this and other similar prospects nearby (TintinaGold Resources Inc., 2010). In 2007, NovaGold carried out extensive field work in the area emphasizing geologic mapping and geochemical sampling.|
|Indication of production||None|
|Reserve estimates||Walters (1969) suggested reserves of from 1 to 10 million tons of barite.|
Schmidt, J.M., and Folger, P.F., 1986, Lead-zinc-silver mineralization in Paleozoic dolostones, Powdermilk prospect, Baird Mountains B-4 quadrangle: in Bartsch-Winkler, S., and Reed, K.M., eds., Geologic studies in Alaska by the U.S. Geological Survey during 1985: U.S. Geological Survey Circular 978, p. 19-21.
|Reporters||Anita Williams (Anchorage, AK); D.J. Grybeck (Contractor, U.S. Geological Survey)|
|Last report date||4/2/2010|