Discovery of the orebody, a faulted segment of the San Manuel orebody, was based on recognition of: (1) a zonal pattern in which ore is marginal to a low-grade core with potassic alterations--the zone of highest intensity; (2) evidence for post-mineralization tilting of 45 degrees or more; (3) large-scale mullion structure on the tilted San Manuel fault that indicated the direction of offset.

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