The principal structural features of the Pulacayo silver mine area are an andesitic stock intruded in the axial zone of an anticlinal structure and two well-defined interconnected vein systems, characterized by development in different lithologic environments and origin in a postintrusive phase during which shearing occurred at depth and tension fracturing in near-surface zones, as a result of movement of the deeper fissure system. Dislocation is attributed to subsidence accompanying shrinkage of the stock due to cooling.

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