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Beschreibung

The product is a compositional reference material having primarily a siliceous matrix and an intermediate gold concentration. It is inferred, from a mineralogical examination of material from the same mine previously used to produce MA-1 and MA-2, that quartz, feldspar, dolomite, muscovite, and chlorite are major mineral constituents in decreasing order of abundance. Pyrite, chalcopyrite, sphalerite, hematite, magnetite, altaite (PbTe), and melonite (NiTe2) are present in minor-to-trace levels. Calaverite (AuTe2) occurs as inclusions in some pyrite grains. The majority of gold occurs as an electrum (containing silver) dispersed in the gangue minerals.CAMET-MA-3a is mainly intended for methods of analysis of gold involving fire assay preconcentration with a sample size of 15g or more. Other techniques will be suitable providing a large enough sample is taken.