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Published online by Cambridge University Press: 14 March 2018
Early in 1909 a small quantity of fine sand was brought to the writer from a big Chinese-owned mine at Rotan Dahan, in the district of Kinta, the leading tin-producing district of Perak and, indeed, of any of the Federated States. The sand was a concentrate, and had been obtained in the final washing of the rough tin-ore concentrates, whereby the heavier impurities, generally referred to locally as ‘amang’, are separated from the cassiterite. In this case, however, the Chinese miner found that there was a reddish mineral present which he could not separate from the cassiterite. This proved to be native copper, and the mode of occurrence is of sufficient interest to watTant a brief description of this and other samples of ore from the same mine and an adjoining mine working on the same deposit.
1 Three of these slides have been presented to the Mineral Collection of the British Museum (Natural History). They were prepared after the concentrate had been in the writer's possession for some time, and the sand was treated with weak hydrochloric acid to remove the tarnish. When the concentrate was fresh, the crystals of copper showed brilliant metallic surfaces.