A Review of Favorable Offshore and Coastal Depositional Sites for Platinum-group Metals in the Goodnews Bay Mining District, Alaska.
NTIS: PB 88-210885 :25 pages
This report describes mineral investigations conducted by the Bureau of Mines on geologic and depositional processes contributing to potential coastal and offshore platinum-group metal (PGM) placer deposits around the Goodnews Bay Mining District. The Bureau found that favorable environments for PGM along with gold and chromite enrichment include: (1) buried paleofluvial channels; (2) recent paleofluvial channels with little marine sediment overburden; (3) beach deposits, particularly in the upper swash zone and near back beach environments; (4) paleostrand lines; (5) shoal lag deposits inside the mouths of Goodnews and Chagvan Bays; and (6) bases of far offshore tidal ridges which may represent reworked glacial deposits. Limited geologic and compositional (assay) data prevent determination of deposit size and grade of PGM mineralization for each deposit class. Future geologic sampling requirements for demonstration of identifiable offshore and beach PGM-bearing placers are discussed. Beach and offshore sampling programs conducted by the Bureau in 1986 will contribute additional information providing verification of specific deposit classes.
NTIS Accession No.
NTIS: PB 88-210885
BoM Alaska Field Oper. Cntr