Mar 20, 2016 · By perfect concentration, assuming the lead to be as galena and the zinc as sphalerite: The value of crude ore by perfect concentration is then for the lead concentrate and for the zinc, or a total of per ton of crude ore. By formula .

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Feb 12, 2017 · The experiments described in this paper were undertaken primarily for the purpose of measuring the quality of work done in screening and sorting in American concentratingmills for Prof. Richards' work on this purpose a series of samples of screened and sorted products was obtained from four different mills, and a plan was devised for sizing these products, and for .

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