The Harding pegmatite intrudes along the boundary between the amphibolite and schist facies of the Vadito Group. The various outcroppings form a belt about 2500 feet long and 150 to 500 feet wide. Radiometric ages are somewhat discordant, ranging from 1260 Mya for four Harding muscovites to 1350 Mya … See more The Harding Pegmatite Mine is a former adit mine that extracted lithium, tantalum, and beryllium from a Precambrian pegmatite sill. It ceased operations in 1958 and its owner, Arthur Montgomery, donated it to the See more Although the quartz pegmatite had attracted the attention of prospectors since before 1900, the extensive deposits of lepidolite were not recognized until 1918 by Joseph J. Peyer. … See more In 1974, Arthur Montgomery offered to donate the property to the University of New Mexico. The university leased the property for four years while making numerous … See more WebJul 27, 2011 · The main attraction at the Harding mine is its pegmatite. Pegmatite forms from volatile-rich magma (usually granitic), which can travel large distances from its …
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