US Gypsum Co. of Borrego Springs, California | 15 Mining …
US Gypsum Co. Mining Claims Listed as: US GYPSUM CO. Overview US Gypsum Co. Map ; Claims 15 ; Nearby 0 Owners; US Gypsum Co. 7801 Split Mountain Road Borrego Springs, California 92004. ... US Gypsum Co. of Borrego Springs, California | 15 Mining Claims. Click to open an interactive map.