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large salt gold ore separating line in San Francisco USA North America

large salt gold ore separating line in San Francisco USA North America

In general,goldis derived from three types ofore: (1)orein whichgoldis the principal metal of value, (2) base-metalorewhich yieldsgoldas a byproduct, and (3) placers. In the early years, most of thegoldwas mined from placers, but after 1873, though placers were by no means depleted and continued to contribute significantly to our ...

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