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Unnamed (lower Eldorado Creek)

Occurrence, Inactive

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Commodities and mineralogy

Main commodities Au
Other commodities Ag; As; Pb
Ore minerals arsenopyrite; galena; pyrite
Gangue minerals calcite; quartz; siderite

Geographic location

Quadrangle map, 1:250,000-scale DN
Quadrangle map, 1:63,360-scale C-2
Latitude 63.5229
Longitude -150.9754
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is on a trail along lower Eldorado Creek. It is in the SE1/4 SE1/4 section 14, T. 16 S., R. 18 W., Fairbanks Meridian. The location is accurate within 500 feet. The occurrence corresponds to number 69 of Hawley and Associates (1978), 12 of Bundtzen, Smith, and Tosdal (1976), and 15 of Bundtzen (1981). The site is probably the same as an occurrence described by Morrison (1964,sample A16).

Geologic setting

Geologic description

The country rock at this occurrence is quartzite, probably of the lower Paleozoic Spruce Creek sequence (Bundtzen, 1981). The occurrence consists of a poorly exposed quartz-siderite vein that strikes strikes about N 25-35 E., and dips 80 SE. The vein contains pyrite, arsenopyrite, and probably galena. Samples assay 0.01 ounce of gold per ton, 0.16 ounce of silver per ton, as much as 0.24 percent lead, and 0.45-0.95 percent arsenic (Thornsberry, McKee, and Salisbury, 1978, v. 2, site 24; Bundtzen, 1981, table 10, number 15). Morrison (1964) reported pyrite and arsenopyrite in quartz-calcite veins at this or a nearby locality. A sample assayed 0.04 ounce of gold per ton.
Geologic map unit (, )
Mineral deposit model Low-sulfide Au?-quartz vein (Cox and Singer, 1986; model 36a?).
Mineral deposit model number 36a?
Age of mineralization The deposit is assumed to be Eocene (see record DN091).

Production and reserves

Workings or exploration The occurrence is a natural exposure in a road cut. There are no workings.
Indication of production None

Additional comments

The occurrence is in Denali National Park and Preserve. It is probably within the boundary of a former placer claim on Eldorado Creek.

References

MRDS Number A011288

References

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.
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).
Morrison, D. A., 1964, Geology and ore deposits of Kantishna and vicinity, Kantishna district, Alaska: College, AK, University of Alaska, M. S. Thesis, 109 p.
Thornsberry, V. V., McKee, C. J., and Salisbury, W. G., eds, 1984, 1983 Mineral Resource Studies: Kantishna Hills and Dunkle Mine Areas, Denali National Park and Preserve, Alaska: U. S. Bureau of Mines Open-File Report 129-84. 3 Volumes: v. 1, Text; v. 2, Appendices; v. 3, Maps. Prepared by Salisbury & Dietz, Inc., Spokane, WA.
Reporters C.C. Hawley
Last report date 5/8/2001