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Beryllium - Round Top
Cyprus Minerals built a modern tunnel into the center of Round Top mountain for a bulk metallurgical sample for its 1988 definitive feasibility study to mine beryllium.
It has been maintained by the State of Texas General Land Office. It is located exactly within the “Contact Zone” between the rhyolite mountain and the underlying sediments, which is 2 to 3 meters thick and highly enriched with beryllium and uranium.