Investigation of a Copper Occurrence in the Rampart Diorites.
McDermott MM; Foley JY; Southworth DD
For Reference Only At Bureau Libraries :26 pages
During the 1976-79 field seasons, the Bureau of Mines made mineral evaluation studies of the trans-Alaska pipeline corridor for the Bureau of Land Management. Part of the work was done by the University of Alaska, who in 1977 reported a body of hornblende diorite in the Rampart Group south of Hess Creek in the Livengood quadrangle that locally contained as much as 10 pct sulfide. In 1979 the Bureau of Mines used a combination of geological, geophysical, and geochemical methods to evaluate the potential of this area for porphyry-type copper deposits. Low concentrations of copper were found as minor occurrences in small diorite dikes and sills. The low concentrations found and the low tonnages implied by this mode of occurrence suggest that the rampart group assemblage has little potential for porphyry-copper-type deposits.
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