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In order to follow the history of the exploration and development of the Big Indian mining district it is necessary to understand a few things about the geology of the uranium ore deposits that were found after Charlie Steen discovered the Mi Vida mine. The most important thing to remember is that none of the ore deposits discovered during the next four years were exposed on the surface.
Although the ore bearing host rocks in the Moss Back member of the Chinle formation did outcrop in a few places along the face of the escarpment overlooking the Big Indian Wash, all of the uranium that was found after 1952 was discovered by exploration drilling. My father’s discovery proved that someone could walk over $100 million worth of uranium ore without knowing what lay beneath their feet unless they were willing to risk money on wildcat drilling in the search for totally hidden ore deposits.
Although the Big Indian mining district was developed from the single drill hole Charlie Steen had drilled through 14 feet of high-grade uranium ore on July 6, 1952, none of the other mines in the district were brought into production on the basis of one drill hole. After the Mi Vida mine proved the existence of uranium ore in the Chinle formation, drilling became the chief guide to finding more ore in the district.
Any drill hole that encountered good mineralization of minable thickness required additional drilling to block out the ore body.