State of Alaska Alaska | Natural Resources DNR | Geological & Geophysical Surveys DGGS | Geochemistry Geochem

Sample Detail

Sample Number 13554 (BLM)

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Reference Number BLM OFR 100
Citation Ellefson, R.M. and others, 2005
Laboratory ALS Chemex
Description Soil and stream sediment samples were kiln dried and sieved to less than 180 microns. The minus 180 fraction was split down to an 8.8 oz sample. Rock samples were crushed so more than 70 percent of the material passed through a screen with 0.08 in openings. The sample was then split down to an 8.8 oz sample that was pulverized until 85 percent passed through a 75 micron screen. Pan concentrate, placer, and sluice concentrate samples were dried and pulverized with out screening. Typical analysis for rocks and sediments was a 1.1 oz (31 g) gold-platinum-palladium fire assay, followed by a 50 element aqua-regia digestion, and a combination of induced coupled plasma-mass spectroscopy (ICP-MS) and ultra trace induced coupled plasma-atomic emission spectroscopy (ICP-AES)analysis. These analyses were followed by pressed pellet X-ray fluorescence spectroscopy (XRF) analysis for barite, tin, and tungsten. Samples with assay results exceeding element-specific detection limits for the standard analysis were reanalyzed by a variety of element-specific procedures.
Sample Type rock

Reference Number Orphaned BLM analyses
Laboratory ALS Chemex
Description Previously associated with BLM OFR 94 and BLM OFR 100, mysterious values for Hg with CVAA, Sn, and W with ICP-AES-MS
Sample Type rock