. Appendix to the Journals of the Senate and Assembly of the ... session of the Legislature of the State of California. iscovered here on thenorth side of the river in the 80s, and former mining activities wereon that side. In March, 1927, development of the deposit south ofthe river was begun and the present output is now coming from thesenew workings. The barite is mined by drifting and stoping. There aretwo adits run on the vein, the face of the upper one being 80 feetbelow the surface. This level is being stoped. The second adit is 180feet below the upper. The workings show the lode to be
. Appendix to the Journals of the Senate and Assembly of the ... session of the Legislature of the State of California. iscovered here on thenorth side of the river in the 80s, and former mining activities wereon that side. In March, 1927, development of the deposit south ofthe river was begun and the present output is now coming from thesenew workings. The barite is mined by drifting and stoping. There aretwo adits run on the vein, the face of the upper one being 80 feetbelow the surface. This level is being stoped. The second adit is 180feet below the upper. The workings show the lode to be irregular, the SAN FRANCISCO FIELD DIVISION 145 vein swellinj^ into a .series of lenses, one large one now opened up beingestimated to contain several hundred thousand tons of barite. Theaverage width of the main vein is 14 feet, and the maximum width sofar developed, 35 feet. There is also a smaller parallel vein from whichsome production has been made. The company controls 500 acres ofland on which the deposit occurs. The barite is shipped crude, asmined, the present output being about 75 tons per day, the crude. Loading bunker at Yosemite Barium Companys Mine,near EI Portal, Mariposa County. material averaging 94% BaS04. Some witherite (BaCOs) is associatedwith the barite in places, but it is not being mined. Equipment at the property includes a Diesel engine, com-pressor, air drills, track, cars, etc. A cable way is being constructed totransport the material across the river to bunkers on the barite is loaded from a chute to auto trucks and hauled to ElPortal for shipment while this is being completed. Sixteen men areemployed. 146 REPORT OF STATE MINERALOGIST FELDSPAR Feldspar occurs as a constituent of the granites and other rocks inYosemite Valley and it has been noted near Coulterville, but the firstreported discovery of what is apparently a commercial deposit of potashfeldspar has just been made (December, 1927). This discovery becameknown subsequen
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