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Offshore extension of platiniferous bedrock and associated sedimentation of the Goodnews Bay Ultramafic Complex, Alaska.

Authors
Barker-JC; Lamal-K
Source
Mar Min 1989 Jan; 8:365-390
Link
NIOSHTIC No.
10008672
Abstract
The Goodnews Bay concentrically zoned Ultramafic complex has produced onshore placer platinum deposits, and more than 650,000 tr oz of platinum-group metals (PGM) have been recovered since 1926. It is generally suspected that placer PGM also occur in the adjacent marine environment; however, no deposits have yet been delineated. Magnetic surveys and sea-floor sediment sampling begun in 1985 show that the complex is a large, south-dipping, lensoidal body that extends offshore to 5 km. The present seafloor was an emergent foreland as recently as 8,000 yr ago. High-energy ocean processes are presently transporting and depositing sediment such that PGM- bearing alluvial and marine sediments are reworked and later masked by barren littoral drift of glacial origin. Exploration targets include (1) placers formed since present transgression began and (2) ancient marine and drowned fluvial deposits.
CODEN
MARMDK
Publication Date
19890101
Document Type
OP; Journal Article
Fiscal Year
1989
NTIS Accession No.
NTIS Price
Identifying No.
OP 198-90
ISSN
0149-0397
NIOSH Division
AFOC
Source Name
Marine Mining
State
AK
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