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what is the marshall and swift mining and milling index for 2012

what is the marshall and swift mining and milling index for 2012

associated with various mining methods. This technique, developed under a Bureau contract by STRAAM Engineers, Inc., was completed in 1975, then updated in 1983. During the course of the update, it was noted that few provisions were made for estimating the costs of small-scale mining and milling methods typically assoc~ated with placer min- ing.

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