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Distribution of Gold, Platinum, Palladium, and Silver in Selected Portions of the Bohemia Basin Deposits, Southeast Alaska (With an Appendix Section on Mirror Harbor).

Still JC
For Reference Only At Bureau Libraries :42 pages
This report presents results of a 1982 Bureau of Mines examination of the Bohemia Basin nickel-copper-cobalt deposits, located on the southeastern portion of Yakobi Island, to determine the potential for platinum-group metals, gold, and silver. The deposits are thought to be magmatic segregations in a zoned composite stock. Demonstrated resources, accessible by open pit mining, are 15.1 million tons averaging 0.37% Nickel, 0.22% Copper, and 0.02% Cobalt. Bureau examination consisted of sampling surface outcrops, adits, and pits; and analysis of selected diamond drill hole samples for platinum-group metals, gold, and silver. Sixty samples were collected from surface outcrops and analyzed, and 185 samples from 5 diamond drill holes were analyzed. The highest gold, platinum, palladium, and silver values from the analysis of 245 surface and drill hole samples were 0.01 Oz/ton gold, 0.006 Oz/ton platinum, 0.004 Oz/ton palladium, and 0.157 Oz/ton silver; 94 of the 185 drill hole samples were analyzed for iridium, osmium, rhodium, and ruthenium, and none was detected. In general, most of the precious metal values were confined to the nickel-copper ore zones, with the highest values often coinciding with the highest nickel-copper values. Precious metals, except silver, are concentrated with copper and are potential low-grade metallurgical byproducts.
Publication Date
Document Type
Fiscal Year
Identifying No.
OFR 10-88
NIOSH Division
Source Name
For Reference Only At Bureau Libraries
Performing Organization
BoM Alaska Field Operations
Page last reviewed: November 19, 2021
Content source: National Institute for Occupational Safety and Health Education and Information Division