Page 240 - miningincalif1927

208 REPORT OF STATE MINERALOGIST.

by the company's Cement, Tolenas and Tidewater railroad, a standard

gauge line.
The dry process of manufacture is used at this plant. Some low-

grade limestone remains in the deposit at the plant site, but all the
limerock now being used is shipped in from the company's mountain
quarries on the Middle Fork of the American River in El Dorado
County, seven miles from Auburn. The output of these quarries has
amounted to more than 1000 tons per day for the past 10 years. The
clay used is dug locally and the gypsum required as a retarder is
shipped in from the company's plant at Gerlach. Eleven short kilns
are used, varying in length from 80 to 100 feet. The mill is operated
by electric power, about 3500 horse power, supplied by the Pacific Gas
and Electric Company, being required. The capacity of the plant is

4200 barrels per day and 90,000 barrels storage capacity is provided.
Three hundred men are employed. The town of Cement closely

approaches an ideal industrial center and little labor turnover results.
M. J. Johnson is plant superintendent.
Bibl: State Mineralogist's Report X, p. 670; XII, p. 395; XIII,
p. 632 XIV, pp. 302-307 ; XVII. p. 243 ; State Mining Bureau
;
Bull. 38, pp. 185-189. Geol. Sur. of Cal., Geol., Vol. I, p. 104.
U. S. Geol. Sur. Bull. 243, p. 120 ; Bull. 522, pp. 118, 121.

CHROMITE.

Chromite is reported to occur near Fairfield. A specimen in the
Bureau Museum is said to have come from that locality, but the extent
of the deposit is unknown.

Bibl: State Mineralogist's Report IV, p. 137; VI, p. 101; VIII.
p. 632; XIV, p. 307. State Mining Bureau Bull. 38, p. 363.

COAL.

An occurrence of lignite coal lias been noted in the southwestern part
of the county in the hills adjacent to Goodyear station. The vein
which has only been exposed for a short distance is six inches in
thickness.
Bibl: State Mineralogist's Report VI, p. 118; VII, p. 151; XIV,

p. 307. Geol. Sur. of Cal., Geol. Vol. I, p. 106.

fuller's earth.

This term includes many kinds of unctuous earths. They are used
in the clarifying, filtering and decolorizing of mineral, animal and
vegetable oils, de-inking of newspapers and many other special uses.

Old Rocky Ranch Deposit. This property comprises 166 acres lying
immediately north of the holdings of the Standard Oil Company.
Fuller's earth, undoubtedly a continuation of the beds exposed farther
south, occurs on the ranch. The deposit has not been developed.
Estate of Dr. L. C. Marshall, owner, Vacaville, Cal.

Bibl: State Mineralogist's Report XIV, pp. 307-309; XVII, p. 243.
State Mining Bureau Bull. 38, p. 273. U. S. Geol. Sur. Bull.
315, pp. 268-290; Bull. 365; 475. Min. Res. 1907, 1911, 1912.
U. S. B. of M. Bull. 71.