Borates in the Muddy Mountains, Clark County
Spring 1990Borate deposits in the Muddy Mountains include the Anniversary mine in Lovell Wash 25 miles east of Las Vegas and deposits in White
Basin 35 miles northeast of Las Vegas. Borate in both areas is in colemanite beds in the upper part of the Horse Spring Formation, a widespread 11-16 Ma nonmarine sedimentary unit in southern Nevada and northwestern Arizona. Although these two areas contain the largest known reserves of borate in Nevada, present activity consists only of minor exploration and assessment work. Cessation of colemanite mining in California, and subsequent reliance on Turkey for colemanite used in textile fiberglass, may make the Muddy Mountain deposits more attractive in the future.
The borate unit is in a limestone sequence characterized by abundant finely laminated algal stromatolites. Features indicating mud-flat deposition (fossil animal tracks and ripple marks) occur in some limestone horizons. Analyses of 30 samples collected from Lovell Wash indicate that magnesium, strontium, and lithium contents of limestone increase as the borate beds are approached stratigraphically. Celestite occurs in mar] and alga limestone within and just above the borate beds, and montmorillonite is relatively abundant in marl interbedded with colemanite.
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