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

Sample Detail

Sample Number RK93GA026

Sample Documentation

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Reference Number OFR 10-95 heavy mineral
Citation OFR 10-95
Laboratory U.S. Bureau of Mines Albany Research Center
Description The samples were weighed, blended, and split for magnetic separation. The samples were screened with 20 and minus 200 mesh. The fraction between 20 and minus 200 was processed on a Frantz Barrier Magnetic Separator at various amps to separate different minerals. Mineralogy was determined using a combination of binocular, petrographic, and scanning-electron microscopes.
Sample Type other

Reference Number OFR 10-95 - head split
Citation OFR 10-95
Laboratory Unknown
Description 546 heavy-mineral concentrate samples were obtained in the study area via hand auger, power auger, and grab samples from beaches, terraces, and rivers. Samples were then dried and weighed. First, samples were passed through a Jones splitter and a head and spiral feed split were obtained. The spiral-feed fraction was reduced to a -10 mesh size, then run through a three-turn rubber-lined fiberglass spiral concentrator. The heavy-mineral concentrate isolated by this process was then dried, weighed, and rotary-split into two fractions - One for assay, and one for geochemical characterization. An unidentified commercial laboratory analyzed the un-separated head fraction for concentrations of Au using atomic absorption spectroscopy following fire assay fusion and for concentrations of Ti and Zr using x-ray fluorescence analysis following borate fusion.
Sample Type other

Reference Number OFR 10-95 - spiral concentrate split
Citation OFR 10-95
Laboratory Unknown
Description 546 heavy-mineral concentrate samples were obtained in the study area via hand auger, power auger, and grab samples from beaches, terraces, and rivers. Samples were then dried and weighed. First, samples were passed through a Jones splitter and a head and spiral feed split were obtained. The spiral-feed fraction was reduced to a -10 mesh size, then run through a three-turn rubber-lined fiberglass spiral concentrator. The heavy-mineral concentrate isolated by this process was then dried, weighed, and rotary-split into two fractions - One for assay, and one for geochemical characterization. An unidentified commercial laboratory analyzed the assay split of spiral-concentrated heavy minerals for concentrations of Au using atomic absorption spectroscopy following fire assay fusion and for concentrations of Ti and Zr using x-ray fluorescence analysis following borate fusion.
Sample Type other