fire assay

fire assay

[¦fīr ′as‚ā]
(materials)
Analysis of a metal-bearing material, especially gold and silver, by heating a sample with a suitable flux and weghing the resulting metal beads.
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The analytical methods are 4-acid Digest and Inductively Coupled Plasma Optical Emission Spectrometry with Lead Fusion Fire Assay with gravimetric finish for silver above over limits.
There, all samples are digested using aqua-regia with an ICP-AES finish and fire assay with AA finish for gold.
In terms of service, the market has been classified into sample preparation, aqua regia digest, mixed acid digest, X-ray fluorescence, hydrogeochemistry, fire assay, and others (including carbon and sulfur analysis and mobile metal ion analysis).
Gold was assayed using a 30g fire assay with AA finish.
The Authority also, currently, has a world-class gold assay laboratory equipped with the state of the art equipment, comprising an X-ray Fluorescence Machine and the all requirements for fire assay analysis, the only acceptable methods worldwide in the assaying of gold.
Eight samples returned values greater than 1.0 g/t Au, and 9 samples returned fire assay values ranging from 0.1 to 1.0 g Au/t.
In conjunction,, the fire Assay for Au (using a 50 gram sample) with an AAS finish was carried out routinely on all samples submitted.
AnchorCert Analytical will present a detailed talk on 'Analysis of high purity gold by the Fire Assay method' at this year's LMBA Assaying and Refining Conference, to be held at The Royal Garden Hotel, Kensington, London from 19 to 22 March.
The samples from this zone have been resubmitted for Screen Fire Assay. The presence of this reef in drill hole GHD011 is being assessed.
That method, called fire assay, puts tablespoon-sized samples through lengthy chemical tests.
"ICP has the capability of assaying over 30 types of precious metals including gold, silver and platinum, and its methods provide a complete analysis of the assayed samples compared to the standard technique of Fire Assay," explained Medakka.
Assays are conducted using a standard fire assay technique on a 30 gram sample with a gravimetric finish by Laboratoire Expert Inc., of Rouyn-Noranda, Quebec.