|Quadrangle map, 1:250,000-scale||CI|
|Quadrangle map, 1:63,360-scale||B-6|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||Occurrence is sample number 025, in Holm (1973). The sample is located on the north headwater fork of Hope Creek, NW1/4 SW1/4 sec. 22, T. 7 N., R. 6 E.|
Geologic descriptionThe occurrence is a 15-cm-wide fluorite vein in a fine-grained quartz- and opal-bearing breccia zone in a contact phase of biotite granite. Minor sulfide mineralization occurs in carbonate-bearing metamorphic rocks at the head of Hope Creek. Sulfides present are pyrrhotite, marcasite, and sphalerite with blebs of chalcopyrite, pyrite and arsenopyrite. None of these minerals occurs in quantities of economic significance. Samples of granite taken near the head of Hope Creek contained trace to small amounts of allanite (?), fluorite, galena, malachite, molybdenite, pyrite, pyrrhotite, rutile, scheelite and stibnite (Holm, 1973). Biotite from this granite has been dated at 59.5 +/- 1.8 m.a. by the K/Ar method (Holm, 1973).
|Geologic map unit||(-146.504476979908, 65.4176012742801)|
|Age of mineralization||The principal occurrence is a fluorite vein in a fine-grained quartz- and opal-bearing breccia zone in a contact phase of biotite granite. The biotite in the granite has been dated at 59.5 +/- 1.8 m.a. by the K/Ar method (Holm, 1973).|
|Workings or exploration||Surface samples taken.|
|Indication of production||None|
Foster, H.L., Laird, Jo, Keith T.E.C., Cushing, G.W., and Menzie, W.D., 1983, Preliminary geologic map of the Circle quadrangle, Alaska: U.S. Geological Survey Open-File Report 83-170-A, 32 p., 1 sheet, scale 1:250,000.
Holm, Bjarne, 1973, Bedrock geology and mineralization of the Mount Prindle area, Yukon-Tanana upland: Fairbanks, University of Alaska, M.Sc. thesis, 55 p., 2 plates.
Menzie, W.D., Foster, H.L., Tripp, R.B., and Yeend, W.E., 1983, Mineral resource assessment of the Circle quadrangle, Alaska: U.S. Geological Survey Open-File Report 83-170-B, 61 p., 1 sheet, 1:250,000.
|Reporters||C.J. Freeman, J.R. Guidetti Schaefer, A.S. Clements (Avalon Development Corporation)|
|Last report date||9/14/1998|