|Quadrangle map, 1:250,000-scale||SK|
|Quadrangle map, 1:63,360-scale||A-4|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||This occurrence is at an elevation of approximately 2,900 feet on Minnesota Ridge in Glacier Bay National Park and Preserve. It is in the NE1/4, section 17, T. 33 S., R. 55 E. of the Copper River Meridian. It is shown as location 5 in Cobb (1972 [MF-424]) and in figure C-66 of Brew and others (1978).|
The following description is summarized from Brew and others (1978).The northwest portion of Minnesota Ridge consists of locally iron-stained quartz diorite cut by a few andesite dikes. The iron-stained quartz diorite has small amounts of chalcopyrite smeared along tiny fractures. The highest values obtained from nine samples were 490 ppm copper, 30 ppm molybdenum, 0.10 ppm gold, and 0.7 ppm silver. Based on the age of the host intrusion, the mineralization must be Cretaceous or younger in age.
|Geologic map unit||(-136.271886803329, 59.0095993713308)|
|Mineral deposit model||There is too little information to adequately characterize this occurrence.|
|Age of mineralization||Based on the age of the host intrusion, the mineralization must be Cretaceous or younger in age (Brew, 1978).|
|Indication of production||None|
Additional commentsThis is a very low grade occurrence. The deposit is within Glacier Bay National Park and Preserve where exploration and development is restricted.
Brew, D.A., Johnson, B.R., Grybeck, D., Griscom, A., Barnes, D.F., Kimball, A.L., Still, J.C., and Rataj, J.L., 1978, Mineral resources of the Glacier Bay National Monument Wilderness Study Area, Alaska: U.S. Geological Survey Open-File Report 78-494, 670 p., 7 sheets.
Cobb, E.H., 1972, Metallic mineral resources map of the Skagway quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-424, 1 sheet, scale 1:250,000.
Cobb, E.H., 1981, Summaries of data on and lists of references to metallic and selected nonmetallic mineral occurrences in the Skagway quadrangle, Alaska; Supplement to Open-File Report 78-316; Part A, Summaries of data to January 1, 1980: U.S. Geological Survey Open-File Report 81-82-A, 11 p.
Cobb, E.H., 1981, Summaries of data on and lists of references to metallic and selected nonmetallic mineral occurrences in the Skagway quadrangle, Alaska; Supplement to Open-File Report 78-316; Part B, Lists of references to January 1, 1980: U.S. Geological Survey Open-File Report 81-82-B, 10 p.
|Reporters||T.C. Crafford (T. Crafford & Associates, Anchorage)|
|Last report date||2/4/2001|