Abstract
IN the last year of the eighteenth century Great Britain produced about 75 per cent, of the world's output of copper. The Cornish miners supplied most of the ore, and the Swansea smelters extracted and refined the metal. In the United States of America only a few tons were made. In 1913 the positions were reversed. Great Britain smelted and refined barely 6 per cent, of the world's production of this metal, and all but an insignificant fraction was derived from imported ores, matte, blister copper, and precipitate or cement copper. In the same year the United States of America furnished more than 55 per cent, of the world's total, and by far the greater part of this was obtained from home supplies of ore.
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CARPENTER, H. A New Copper-Refining Industry in Great Britain . Nature 104, 666 (1920). https://doi.org/10.1038/104666a0
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DOI: https://doi.org/10.1038/104666a0