The Oklahoma-Kansas field of the Tri-State zinc and lead mining district is unique in that some of its mines produce oil as well as zinc and lead ore. The oil comes from above the mine workings, which range in depth from 150 to 400 feet from the surface. The original oil reservoirs are directly under the Pennsylvanian shale. The ore deposits are in rocks of Mississippian age. As the water is lowered, incident to mining operations, the oil enters the mine workings through fissures and shattered zones.

The importance of geologic structure and its relationship to oil and gas and ore deposits are evident. In each type, given a source of supply, the accumulation has been possible because favorable reservoirs were created and made accessible by structural deformation of the containing formations.

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