January 1987
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6 Citations
To date, placer Au has been the only significant metallic mineral resource from the Circle quadrangle, but the general geologic setting is similar to that of regions that contain Sn greisen deposits, W skarn deposits, lode Au deposits in metasedimentary rocks, and U vein deposits. The discovery of 2 diamonds in the gravels of Crooked Creek point to the slight possibility of finding placer or lode diamond deposits. Although most of the past, and present Au mining has taken place in 4 areas in the quadrangle, a sedimentary basin near the town of Central was identified as possibly containing buried placer Au deposits or sedimentary U deposits.-from Authors