|Quadrangle map, 1:250,000-scale||FB|
|Quadrangle map, 1:63,360-scale||D-1|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||The Yellow Pup mine is located in the SW1/4SE1/4, sec. 21, T. 2 N., R. 2 E., Fairbanks Meridian. The Yellow Pup mine is at an elevation of 1,900 feet near the head of Yellow Pup Creek, about 0.5 mile east of the summit of Gilmore Dome. The mine is locality 34 of Cobb (1972 [MF 410]).|
Geologic descriptionThe following description of the Yellow Pup tungsten deposit is summarized from Robinson (1981). The rocks consist of a hornfelsed sequence of feldspar-quartz schist, biotite-muscovite-quartz schist, muscovite-quartz schist, calc-amphibolite, and marble. The tungsten-bearing beds occur in pelitic schists and quartzite that contain resorbed biotite and andalusite porphyroblasts that reflect hornfelsing caused by the intrusion of the nearby Gilmore Dome stock. The tungsten-bearing rocks are marble, calc-amphibolites, and siliceous calc-silicate rocks. These rocks form distinctive layers within a package of rocks dominated by barren mica schist, quartz schist, and quartzite. Two types of calc-amphibolites are present. The most common is epidote amphibolite, which has sporadic concentrations of scheelite and powellite. The other calc-amphibolite occurs in a 2-meter-thick layer in the main open cut and consists of hornblende, quartz, tremolite, muscovite, epidote clinozoisite, garnet, plagioclase, and chlorite. There may be as much as 10 percent scheelite in this amphibolite. In the mine, the mineralized zone is arched into a small, north-plunging, asymmetrical antiform that flattens to the south where it is truncated by a high-angle fault. Most mineralization appears to be within the eastern limb of the structure. Other scheelite occurrences are present in epidote-amphibolite layers in surface trenches; the size of these zones varies, but none appear to be as large or as high grade as the calc-amphibolite zone.
|Geologic map unit||(-147.350438411788, 64.9805769764569)|
|Mineral deposit model||W skarn deposit (Cox and Singer, 1986; model 14a)|
|Mineral deposit model number||14a|
|Workings or exploration||An adit was driven 12 feet soon after the discovery of the deposit in 1942 (Thorne and others, 1948, p. 8-9). In 1981, the workings consisted of several open cuts and trenches over an area approximately 1,000 feet long by 300 feet wide (Robinson, 1981).|
|Indication of production||Yes; small|
|Production notes||After its discovery in 1942, 35 tons of ore from the tunnel were stockpiled (Thorne and others, 1948, p. 8-9). In the late 1970s, several tons of high-grade tungsten concentrates were shipped, and a large amount of unmilled ore was stockpiled (Robinson, 1981, p. 1). In 1981, Vincent Monzuella produced a few tons of scheelite concentrate and stockpiled a larger amount of high-grade, unmilled ore (Bundtzen and others, 1982, p. 27).|
|MRDS Number||A015307; D002671|
Bain, H.F., 1946, Alaska's minerals as a basis for industry: U.S. Bureau of Mines Information Circular 7379, 89 p.
Berg, H.C., and Cobb, E.H., 1967, Metalliferous lode deposits of Alaska: U.S. Geological Survey Bulletin 1246, 254 p.
Bundtzen, T.K., Robinson, M.S., Kline, J.T., and Albanese, M.D., 1982, Geology of the Clipper gold mine, Fairbanks mining district, Alaska: Alaska Division of Geological and Geophysical Surveys Open-File Report 157, 13 p., 1 sheet, scale 1:120.
Byers, F.M., Jr., 1957, Tungsten deposits in the Fairbanks district, Alaska: U.S. Geological Survey Bulletin 1024-I, p. 179-216.
Chapman, R.M., and Foster, R.L., 1969, Lode mines and prospects in the Fairbanks district, Alaska: U.S. Geological Survey Professional Paper 625-D, 25 p., 1 plate.
Cobb, E.H., 1972, Metallic mineral resources map of the Fairbanks quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-410, 1 sheet, scale 1:250,000.
Cobb, E.H., 1975, Mineral resources of Alaska, in Yount, M.E., ed., U.S. Geological Survey Alaska Program, 1975: U.S. Geological Survey Circular 722, p. 37.
Cobb, E.H., 1976, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Fairbanks quadrangle, Alaska: U.S. Geological Survey Open-File Report 76-662, 174 p.
Robinson, M.S., 1981, Surface geology and ground magnetics of the yellow pup tungsten deposit, Gilmore Dome, Fairbanks Mining District: Alaska Division of Geological & Geophysical Surveys Alaska Open-File Report 137, 12 p., 1 sheet, scale 1 inch = 100 feet.
|Reporters||J.R. Guidetti Schaefer and C.J. Freeman (Avalon Development Corporation)|
|Last report date||7/31/2001|