mosphere. The method of using the balance is as follows: The sub- a The box is provided with glass sides, one of them form- ELECTRO-ASSAY OF COPPER ORES, stance to be weighed is placed in the scale pan, and the ing a door which can be opeved or closed at pleasure. The average copper ore is… … The operations are, reduction of the ore to a uniform powder, sampling, decomposition and solution in acids, separation of the soluble and insoluble portions, decomposi- cient to suspend the pan with its load before the mirror. tion of the dissolved copper salts, and separation of the cop- As soon…
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