|Quadrangle map, 1:250,000-scale||MH|
|Quadrangle map, 1:63,360-scale||B-6|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||This lode occurrence is at an elevation of about 3,900 feet on the north side of Spray Creek, in the SW1/4SW1/4 section 2, T. 19 S., R. 6 E., Fairbanks Meridian. Mineralization probably extends into the eastern part of section 10 of the previously cited township and range. The location corresponds approximately to locality 24 on figure 4 of Cobb (1979 [OFR 79-238]); to locality 18 of Kaufman (1964); to locality A12 of Kurtak and others (1992); and possibly to McLaren Copper (Heiner and Porter, 1972, Kardex site number KX68-41). The location cited here is probably within 500 feet of locality A12 of Kurtak and others (1992).|
The occurrence is hosted in basaltic greenstone of the Nikolai Greenstone of Late Triassic age, a characteristic unit of the Wrangellia terrane (Nokleberg and others, 1982, 1991).The basalt is well exposed in an incised lower canyon of Spray Creek. Randomly oriented shear zones, as much as 5 feet across, cut epidotized basalt. The shear zones can be traced for as much as 100 feet on strike. Mineralized quartz-carbonate veinlets in the shear zones contain bornite and tetrahedrite and are stained with malachite. Grab samples of vein material contain as much as 3.17 percent copper and 9 parts per million (ppm) silver; sample 1651 assayed 760 parts per billion gold and 145 ppm tungsten (Kurtak and others, 1992, table A12). Kaufman (1964, locality 18) earlier reported bornite and chalcopyrite in randomly oriented fractures on the steep north wall of the canyon.
|Geologic map unit||(-146.5566666797, 63.2907695712197)|
|Mineral deposit model||Low-sulfide copper-bearing quartz-carbonate veins. Basaltic Cu (Cox and Singer, 1986; model 23).|
|Mineral deposit model number||23|
|Age of mineralization||Probably Cretaceous or early Tertiary (see MH060).|
|Alteration of deposit||Introduction of epidote into basaltic greenstone.|
|Workings or exploration||The area has been staked variously as the Tiny Tim, KAA, and MacLaren Copper claims nos. 1-4. Claims were first staked in 1955; one claim was located as recently as 1989 (Heiner and Porter, 1972; U.S. Bureau of Mines, 1973; Kurtak and others, 1992). There are no important workings.|
|Indication of production||None|
Cobb, E.H., 1979, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Mount Hayes quadrangle, Alaska: U.S. Geological Survey Open-File Report 79-238, 140 p.
Heiner, L.E., and Porter, Eve, 1972, Alaska Mineral Properties, volume 2: University of Alaska, Mineral Industry Research Laboratory Report 24, 669 p.
Kaufman, M.A., 1964, Geology and mineral deposits of the Denali-Maclaren River area, Alaska: Alaska Division of Mines and Minerals Geologic Report 4, 15 p., 1 sheet, scale 1:125,000.
Kurtak, J.M., Southworth, D.D., Balen, M.D., and Clautice, K.H., 1991, Mineral investigations in the Valdez Creek Mining District, south-central Alaska: U.S. Bureau of Mines Open-File Report 1-92, 658 p., 2 sheets, scale 1:250,000.
Nokleberg, W.J., Albert, N.R.D., Bond, G.C., Herzon, P.L., Miyaoka, R.T., Nelson, W.H., Richter, D.H., Smith T.E., Stout, J.H., Yeend, Warren, and Zehner, R.E., 1982, Geologic map of the southern Mount Hayes quadrangle, Alaska: U.S. Geological Survey Open-File Report 82-52, 27 p., 1 sheet,scale 1:250,000.
Nokleberg, W.J., Lange, I.M., Roback, R.C., Yeend, Warren, and Silva, S.R., 1991, Map showing locations of metalliferous lode and placer mineral occurrences, mineral deposits, prospects, and mines, Mount Hayes quadrangle, eastern Alaska Range, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-1996-C, 42 p., 1 sheet, scale 1:250,000.
Stout, J.H., 1976, Geology of the Eureka Creek area, east-central Alaska Range: Alaska Division of Geological and Geophysical Surveys Geologic Report 46, 32 p., 1 plate, scale 1:63,360.
U.S. Bureau of Mines, 1973, Alaska 1:250,000-scale quadrangle map overlays showing mineral deposit locations, principal minerals, and number and type of claims: U.S. Bureau of Mines Open-File Report 20-73, 95 overlays (updated in 1986, 1987).
|Reporters||W.T. Ellis (Alaska Earth Science), C.C. Hawley (Hawley Resource Group), and W.J. Nokleberg (USGS)|
|Last report date||7/31/2001|