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Updated: May 17, 2025
Indeed, the judicious admixture of ores constitutes the most important vocation of the smelter; and it is to this that the copper-houses of Swansea are indebted for one of their advantages over the proprietors of mines, who, possessing only one kind of ore rich, probably, but intractable can never bring it into the state of a metal with any satisfactory profit. 'What is the value of these ores?
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