In 1931 while prospecting the ridge south of the Harding mine, Juan A. Brown of Dixon, New Mexico, unearthed a calcite deposit beneath two or three feet of overburden. Not realizing the character or possible worth of the deposit, its apex was blasted in order to open up and develop the property. The blasting shock undoubtedly ruined some of the near-surface Iceland spar in the deposit, but exposure in this manner revealed material of optical grade.

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