Quarterly, Volume 99The School, 1999 - Engineering |
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25 grams 30 grams alloy annealing antimony aphanitic Asian assay assayers balance bisilicate bismuth boiling bone ash borax glass bullion cent charge chemical chloride clay color Colorado School composition constituents containing cool copper crucible cupel determine dilute dissolved excess feldspar filter fire assaying flour furnace fused fusion give gold and silver grains grams of lead heat hydrochloric acid igneous impurities inches iridium iron lead button litharge loss of silver material matte melting metamorphic method milligram minerals mixture muffle niter nitric acid obtained ounces palladium particles phaneritic plagioclase Porphyry potassium precious metals precipitate present proportion pulp pyrite quantity quartz reaction reagents reducing agent reducing power removed residue rhodium rocks ruthenium sample SAN DIEGO sandstone School of Mines scorifier sedimentary silica Singapore SiO2 slag small amount sodium carbonate soluble solution specific gravity sulphate sulphides sulphuric acid surface tellurium temperature UNIVERSITY usually washing weight zinc