‡Ref.: Schrader, F.C. & J.M. Hill (1915), Mineral deposits of the Santa Rita and Patagonia Mountains, Arizona, USGS Bull. 582: 360.
A deposit of lignite in the western part of the Whetstone Mountains.
The lignite occurs in a 40 foot zone in a formation of inclined sandstone and shale or slate which is apparently Mesozoic and with which it is conformable. The zone is reported to have a known horizontal extent of nearly ½ mile. Associated with the deposit are reported to be plentiful remains of petrified trees, some being about 100 feet long.
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