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Final Report of Stream Sediment, Float, and Bedrock Sampling in the Porcupine Mining Area, Southeast Alaska.
Still-JC; Gilbert-WG; Forbes-RB
For Reference Only At Bureau Libraries :35 pages
This report describes a survey of 687 stream sediment, pan concentrate, soil, float, rubblecrop, and bedrock samples from the Porcupine Mining Area near Haines, Alaska. More than 460 of the 687 samples collected contained anomalous concentrations of one or more elements, indicating the possible presence of several deposit types. Types include zinc-silver-lead-barium volcanic- or sedimentary- hosted massive sulfide deposits, gold-silver or base metal vein deposits, and sedimentary-hosted large tonnage low-grade gold and gold-bearing copper cobalt skarn deposits. Stream sediment samples contained up to 62.25 Parts per million (ppm) gold, 10 ppm silver, 1,810 ppm zinc, 2,800 ppm barium, 500 ppm tin, 300 ppm arsenic, 400 ppm nickel, and 30,000 ppm antimony. Bedrock and rubblecrop samples contained up to 24.83 Ppm gold, 17.14 Ppm silver, 13.4 percent zinc, 940 ppm cobalt, 47 percent barium, 500 ppm tin, 4 percent arsenic, 900 ppm bismuth, and 8,000 ppm antimony.
For Reference Only At Bureau Libraries
Page last reviewed: April 12, 2019
Content source: National Institute for Occupational Safety and Health Education and Information Division