|Quadrangle map, 1:250,000-scale||CH|
|Quadrangle map, 1:63,360-scale||B-6|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||This occurrence is at an elevation of about 4,900 feet on the ridge east of the head of Howard Creek. It is about 5.4 miles east-southeast of Wiseman and about 0.6 mile southwest of the center of section 36, T. 30 N., R. 11 W.|
Geologic descriptionThis occurrence was originally noted by Brosgé and Reiser (1964) as an occurrence of metallic minerals that contained copper and nickel. Mulligan (1974) described it as widely but very sparsely distributed, cherry-sized pods of quartz and pyrrhotite with traces of galena and chalcopyrite in chloritic schist. Goethite stains accompanies these pods. Pyrite veinlets along joints and fractures in the schist contain trace amounts of copper. The rocks in the area are lower Paleozoic to Proterozoic, interlayered quartzite and graphitic albite-chlorite-muscovite-quartz schist near a contact with Lower Paleozoic to Proterozoic calcareous schist and marble (Dillon and Reifenstuhl, 1995). At or near this occurrence, Kurtak and others (2002) investigated about 1.5 miles of the contact of interbedded quartzite and graphitic schist with calcareous schist and marble. They collected 11 samples of marble, schist, and quartz veins. They found no mineralization and the only anomalous metal value was in a sample of pyritic quartz-chlorite schist that contained 455 parts per million zinc.
|Geologic map unit||(-149.921537473825, 67.377477005081)|
|Mineral deposit model||Insufficient information to assign.|
|Age of mineralization||Paleozoic or younger based on the age of the host rocks.|
|Alteration of deposit||Oxidized Fe sulfides.|
|Workings or exploration||Only limited sampling by the U.S. Geological Survey and Bureau of Land Management.|
|Indication of production||None|
Additional commentsMAS No. 0020310075
Cobb, E.H., 1976, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Chandalar and Wiseman quadrangles, Alaska: U.S. Geological Survey Open-File Report 76-340, 205 p.
Cobb, E.H., and Cruz, E.L., 1983, Summaries of data and lists of references to metallic and selected nonmetallic mineral deposits in the Chandalar quadrangle, Alaska: U.S. Geological Survey Open-File Report 83-278, 91 p.
Dillon, J.T., and Reifenstuhl, R.R., 1995, Geologic map of the Chandalar C-6 quadrangle, southeastern Brooks Range, Alaska: Alaska Division of Geological and Geophysical Surveys Professional Report 105, 1 sheet, scale 1:63,360.
Kurtak, J.M., Klieforth, R.F., Clark, J.M., and Maclean, E.A., 2002, Mineral investigations in the Koyukuk mining district, northern Alaska, 2 vols.: Bureau of Land Management, Alaska Technical Report 50, 845 p.
|Reporters||J.M. Britton (Anchorage, Alaska); D.J. Grybeck (Contractor, U.S. Geological Survey)|
|Last report date||4/18/2010|