Abstract

Three principal structural environments favorable for the emplacement of lead ores are associated with distinctive types of lead deposits. The fault zone environment is present along zones of faulting which commonly consist of a large number of individual faults that form an intricate parallel, sub-parallel, and branching pattern. The basic conditions for the knob and ridge environment are basement rock knobs and ridges surrounded by sediments with initial dip and a local fracture system. The structural block environment was created by a combination of folding and faulting movements that produced a reversal in the direction of dip within a triangular section, the Flat River structural block.

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