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

Sample Detail

Sample Number 16ET275
Project Tok River

Sample Documentation

Analyses [Download All]

Reference Number FA16137607, FA16172469
Reference Date 2016-11-01
Citation RDF 2016-9
Laboratory ALS Geochemistry
Laboratory Number 16ET275
Description Rock samples were processed by ALS Geochemistry using their PREP-31 package. The samples were crushed to greater than 70 percent passing 2 mm, and a 250 g split was pulverized to greater than 85 percent passing 75 microns. Major- and trace-element values for rock samples were determined by ALS Geochemistry method ME-MS61: Four-acid digestion followed by inductively-coupled plasma-atomic emission spectrometry (ICP-AES) and inductively-coupled plasma-mass spectroscopy (ICP-MS); Au values were analyzed using flux digestion and fire assay and ICP-AES (ALS Geochemistry method Au-ICP21). Samples that exceeded detection limits for elements of interest were reanalyzed using specific elemental tests. Over-limit values for Ag, Cu, Pb, As, S, and Zn were analyzed using four-acid digestion followed by inductively-coupled plasma-atomic emission spectrometry (ALS Geochemistry method ME-OG62). Over-limit values for Sb were determined using lithium metaborate fusion and X-ray fluorescence (ALS Geochemistry method ME-XRF15c).
Sample Type rock