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

Sample Detail

Sample Number 04Z236A
Project Council and Solomon mining districts, Solomon and Bendeleben quadrangles

Sample Documentation

Analyses [Download All]

Reference Number VA04070985
Reference Date 2004-10-25
Citation RDF 2005-2
Laboratory ALS Chemex
Description Samples were crushed with a Terminator jaw crusher with chrome steel alloy plates so that at least 70% of the material passed through a -10 (2 mm) mesh screen. Aliquots of 200 and 30 grams were taken using a stainless steel riffle splitter. The samples were then pulverized in a chrome steel ring mill so that 85% of the sample passed through a -200 (75 micron) mesh screen. Most trace-element analyses were performed on the 200 gram split while gold analyses were performed on the 30 gram split. 236 samples were analyzed for gold on a 30-gram split using Atomic Absorption Spectroscopy after Fire Assay. 6 samples containing greater than 1000 ppb gold were re-analyzed with a gravimetric finish following fire assay fusion. 46 samples containing greater than 15 ppb gold were assayed for mercury by Cold Vapor Atomic Absorption Spectroscopy after HCl:HNO3 (3:1) acid digestion. 233 samples were analyzed for trace elements by Inductively Coupled Plasma - Atomic Emission Spectroscopy methods following HF-HNO3-HClO4 acid digestion with HCl leach. This method of digestion is possibly incomplete for some elements and may result in lower analytical results for certain elements. Sample 04SAH115A exhibits possible Au nugget effect. 2nd grav result is 4.92 ppm.
Sample Type rock