|Main commodities||Cu; Sb; Zn|
|Other commodities||Ag; Au; Mo|
|Ore minerals||chalcopyrite; hematite; magnetite; pyrite; sphalerite; stibnite|
|Gangue minerals||epidote; tourmaline|
|Quadrangle map, 1:250,000-scale||DN|
|Quadrangle map, 1:63,360-scale||D-1|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||The Little Caribou occurrence (Cobb, 1980 [OFR 80-363]) is at an elevation of about 2900 feet on a ridge about 1/2 mile north of Little Caribou Creek . The location is about on the boundary between the Mt. McKinley D-1 and D-2 quadrangles. It is accurate within 500 feet. The Little Caribou site correponds to location 69 of Bundtzen, Smith, and Tosdal (1976), D of Hawley and Associates (1978), 77a of Bundtzen (1981), and 29 of MacKevett and Holloway (1977).|
The Little Caribou occurrence is a skarn deposit in a relatively thin marble layer in contact with mica schist of the Birch Creek Schist. No nearby intrusive is known. The skarn is 3 to 5 feet thick and can be followed for about 500 feet. It consists of epidote and magnetite, accompanied by small amounts of pyrite, chalcopyrite, stibnite, and sphalerite; tourmaline occurs locally. Samples of the skarn assay 0.01-0.03 ounce of gold per ton, 0.01 to 0.17 ounce of silver per ton, up to 0.37 percent zinc, and a little copper and lead (Bundtzen, 1981). Stibnite, in float mainly composed of graphitic schist and marble, occurs near the skarn.Hawley and Associates (1978, fig. and table 4.1-A(2) conducted a soil survey east of the skarn outcrop. The total of Cu+Pb+Zn in soil generally is less than 700 ppm, but one sample contained more than 3500 ppm combined metals, and one contained more than 700 ppm antimony. Stream-sediment samples collected from small creeks that drain the area northwest of the skarn deposit were relatively rich in zinc.
|Geologic map unit||(, )|
|Mineral deposit model||Pb-Zn? skarn deposit (Cox and Singer, 1986; model 18c?).|
|Mineral deposit model number||18c?|
|Age of mineralization||Uncertain; possibly Eocene (see record DN091).|
|Alteration of deposit||Replacement of marble by epidote-magnetite(-tourmaline) skarn.|
|Workings or exploration||The area has been mapped and soil sampled but not otherwise explored.|
|Indication of production||None|
Additional commentsThe occurrence is in Denali National Park and Preserve.
Bundtzen, T. K., 1981, Geology and mineral deposits of the Kantishna Hills, Mt. McKinley quadrangle, Alaska: M. S. Thesis, University of Alaska, College, Alaska, 238 p.
Bundtzen, T.K., Smith, T.E., and Tosdal, R.M., 1976, Progress report--Geology and mineral deposits of the Kantishna Hills: Alaska Division of Geological and Geophysical Surveys Open-File Report AOF-98, 80 p., 2 sheets, scale 1:63,360.
Cobb, E.H., 1980, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Mount McKinley quadrangle, Alaska: U. S. Geological Survey Open-File Report 80-363, 150 p.
Cox, D.P., and Singer, D.A., eds., 1986, Mineral deposit models: U.S. Geological Survey Bulletin 1693, 379 p.
Hawley, C. C. and Associates, Inc, 1978, Mineral appraisal of lands adjacent to Mt. McKinley National Park, Alaska: U. S. Bureau of Mines Open-File Report 24-78, 275 p. (paged by sections).
|Last report date||5/6/2001|