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It is troubled with base metals to such a degree that twenty years ago it would have been only about half as valuable as it is now; for at that time there was no paying way of getting anything out of such rock but the coarser-grained "free" gold; but the new cyanide process has changed all that, and the gold fields of the world now deliver up fifty million dollars' worth of gold per year which would have gone into the tailing-pile under the former conditions.
It is troubled with base metals to such a degree that twenty years ago it would have been only about half as valuable as it is now; for at that time there was no paying way of getting anything out of such rock but the coarser-grained "free" gold; but the new cyanide process has changed all that, and the gold fields of the world now deliver up fifty million dollars' worth of gold per year which would have gone into the tailing-pile under the former conditions.
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