Cobalt-Bearing Deposits Related to Mineral Terranes of Alaska.
For Reference Only At Bureau Libraries :10 pages
Cobalt minerals or anomalous concentrations of cobalt associated with sulfide minerals have been identified in 21 deposits in Alaska. Undoubtedly other deposits exist, but there has been little economic incentive to search for cobalt in Alaska and none has been produced. In the known deposits, cobalt occurs in trace amounts recoverable only if the deposit is mined for other minerals and if the cobalt can be concentrated during mining and milling. Two of the known cobalt occurrences (Brady Glacier and Yakobi Island) are in large copper-nickel deposits. A third (bornite) is associated with a large copper sulfide deposit. A fourth occurrence (Jarvis Glacier) was recently discovered in a geologic setting possibly favorable for massive sulfide deposits similar to the windy-craggy copper-cobalt deposit in nearby British Columbia, Canada. Seventeen of the known cobalt occurrences are in mineral terranes that have been mapped as favorable for finding cobalt. Four of the occurrences are in areas where information had been too scanty to map terranes. This emphasizes both the lack of data on Alaskan mineral resources and the need to periodically update the mineral terrane maps.
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