Report of the State Mineralogist . the quarry, and it has not been worked forsome time. J. M. Christen of Pacheco is the : Bull. 38, p. 316. Healy-Tibbetts Construction Company. See Point Molati Quarry. The Holland Sandstone Brick Company operates a sand plant 1mile east of Antioch in the sand dunes along the San Joaquin method of handling is the same as at the Antioch Sand Plant, dragline scraper operated by electric hoist. One man is employed. Thecompany was organized to manufacture a brick from this clean sand,and a large plant was erected. The bricks were not a success
Report of the State Mineralogist . the quarry, and it has not been worked forsome time. J. M. Christen of Pacheco is the : Bull. 38, p. 316. Healy-Tibbetts Construction Company. See Point Molati Quarry. The Holland Sandstone Brick Company operates a sand plant 1mile east of Antioch in the sand dunes along the San Joaquin method of handling is the same as at the Antioch Sand Plant, dragline scraper operated by electric hoist. One man is employed. Thecompany was organized to manufacture a brick from this clean sand,and a large plant was erected. The bricks were not a success and theold plant has been partially dismantled. H. A. Buck, 22 Battery street,San Francisco, is president. Hutchinson Company. (See Point Richmond and Stege Quarries.) 62 MINES AND MINERAL RESOURCES. The Oakland, Antioch and Eastern Railroad Company operates aquarry alongside of the railroad near Valle Vista. A light-colored vol-canic rock is broken down by blasting and loaded onto the cars by steamshovel. It is used for Photo No. 6. Detail of construction at the Bates, Boreland and Ayer Plant, showing arrange-ment of revolving screens, placed one within the other. Photo by courtesy of Meese andGottfried Company. Point Molate Quarry. The quarry is at the edge of San FranciscoBay 2 miles north of Point Eichmond. The rock is a hard gray meta-morphosed sandstone of the Franciscan formation. It is quarried in alarge open cut whose face varies up to 100 ft. in height. Two steamshovels are in operation on the main floor of the crushing plant. Ina pit 10 ft. below the main floor, 4 bull-wheel derricks are used to loadrock in portable bunkers. These bunkers feed to skips which transport CONTRA COSTA COUNTY. 63 the rock to the crushing plant. This plant is equipped with two No. 5and two No. 3 gyratory crushers, trommels, bucket elevators and beltconveyors. It is operated by electric power. Steam power generatedwith crude oil fuel is used for operating derricks and hoists. For
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectminesandmineralresou
