concentrates. The property was idle until 1913 when acquired by W. H. Thorpe of Los Angeles, who installed 50 ton flotation plant, and operated the property until 1919. In 1919, the property was purchased by the Blue Light Silver Mines Company, Mr. Egabroad, president; C. S. Chapman, vice president and managing director; S. L. Collins, secretary; O. H. Pember, superintendent. Offices, F. & M. Building, Fullerton. The company have been developing the property to date. Claims: Dunlap-Blue Light, Harvey-Blue Light, FlannaganBlue Light, Iron Clad No. 1, No. 2, No. 3, No. 4, Blue Light Extension No. 1, No. 2, No. 3, No. 4, and No. 5. Total holdings amount to 269 acres, of which 60 acres is patented.

The mineral belt in vicinity of Silverado Canyon is two miles wide, and extends nearly north and south for a distance of 8 miles. The country is formed to a great extent of dikes of greenish to blackish rocks, often showing distinct hornblende crystals. The mines south of the canyon are in a feldspathic rock, which is probably an intrusive. porphyry. The crystalline rocks of this region are of the Cretaceous age. Two parallel lodes, known as Blue-Light lode and Dike vein, occur in the metamorphic rocks. The former having proved the most productive, has been extensively developed along its outcrop for a considerable distance. The veins have widths of 2 to 6 feet. The ore is silver bearing galena, associated with zinc-blende and pyrite. Irregular lenses of complex lead-zine sulphide ore occur in these two lodes. Seven known ore bodies have been developed on the Blue Light lode, in the north and south workings from No. 3 tunnel on the Blue Light Mine.

The Blue Light vein strikes N. 16° E., dip 30 degrees to east, and has been proven on the surface for a distance of 4500 feet. Average width of vein being 4 feet. The vein has been developed by seven tunnels. At elevation of 3000 feet, No. 2 tunnel is driven on the vein 350 feet. No. 3 tunnel, which is 50 feet below No. 2 tunnel, is a crosscut tunnel for 200 feet to vein, then driven 470 feet south on vein, this tunnel is connected by upraises and stopes with No. 2 workings. No. 4 tunnel, which is located south of these workings, is a crosscut tunnel driven 900 feet east, cutting the vein at 540 feet from portal; no ore was found at this point and the vein was not drifted on either to the north or south.

The most recent development has been in driving No. 7 tunnel, which is located north of No. 3 workings and at a vertical elevation of about 400 feet below No. 3 workings, in Pine Canyon. The tunnel is driven 50 feet southwest, then crosscut 110 feet east to vein, with drift south 500 feet on the vein, with the expectation of developing the known ore shoots worked in upper workings. It is reported that 8000 tons of ore have been developed above No. 3 tunnel level that has an average value of .06 ozs. gold, 25 ozs. silver, 4% lead and 13% zinc.

Equipment: 14" x 8" x 8" Clayton compressor, driven by semi-Diesel Y-type gas engine, air drills, blacksmith shop, cars and track.

Mill: 50-ton flotation plant, two 9" x 15" Blake jaw crushers, driven by 30 h.p. West Coast gas engine, Challenge ore feeder, 5' x 4' ball mill in closed circuit with Dorr classifier, one 12' K. & K. flotation machine, two 6' K. & K. flotation machines, one Wilfley, one Overstrom and one

Cottrell table, two Dorr thickeners and one Denver filter, flotation plant driven by 100 h.p. Fairbanks-Morse semi-Diesel gas engine. Product: produced in 50-ton flotation plant:

5 cars shipped in 1917 by W. H. Thorpe.

Au..08 ozs. ; Ag. 21 oz.; Pb. 2.28%; Zn. 45%; Fe. 8.6%. Iron concentrate:

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Au..02 ozs.; Ag. 4.3 ozs.; Zn. 0.5%; Fe. 43.5%; S. = 40%. During 1922, shipped to Selby smelters: 52,280 lbs. of lead concentrates, assaying: Au. = 0.29 ozs.; Ag. = 207.20 ozs.; Pb.=19.9%; Zn.31%; S. 26.1%; Fe. 6.2%.

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29,120 lbs. of lead concentrates, assaying: Au. 0.22 ozs.; Ag. = 104 ozs.; Pb.=14.7%; Zn. 21.7%; Fe. 6.2%; S.21%. Also produced a zinc product, assaying: Zn.45%, and carrying 30 ozs. silver, which was stored at plant, and a clean iron product, assaying: Au. = 0.02 ozs.; Ag. 4.3 ozs.; Zn. 0.5%; Fe. =42%; Fe.=42% S.=40%, which was also stored at plant.

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The company plans to increase the capacity of its present experimental flotation plant, as soon as the present plan of development work on No. 7 tunnel level is completed. Ten men are employed.

Riverside County.

CRUSHED ROCK.

Temescal Rock Quarry. The quarry was formerly owned by the Temescal Rock Company, now operated by the Blue Diamond Materials Company, 2200 E. 16th Street, Los Angeles.

The company's holdings cover 1100 acres of mountain land lying in T. 4 S., R. 6 W., S. B. M. The quarry is located in Temescal Canyon, 4 miles southeast of Corona. The material that is being crushed is a rhyolitic porphyry and is very hard and sharp. The mountain side. where the rock is quarried slopes steeply, and has an elevation of 1000 to 1200 feet above the canyon. The bench now being quarried is approximately 350 feet high and 1200 feet long. The present production of the rock crushing plant is 5000 tons per day.

John Schreiner, manager; George Haines, superintendent.

Description of the crushing plant is contained in XVth Report of the State Mineralogist, pp. 586-587, and a more recent description is found in the Engineering and Mining Journal Press, November 24, 1923.

GOLD.

White Mines Corporation, John M. White, president. Offices: 440 Wilcox Building, Los Angeles, is developing a group of claims, located 35 miles north of Indio. The company owns six claims, on which it has a shaft 150 feet deep, and a tunnel driven on the vein 300 feet. The vein has an average width of 3 feet and is said to have an average value of $12.00 per ton in gold. Three men employed.

TIN.

Temescal Tin Mine, located four miles southeast of Corona, on the old Spanish grant, known as the El Sobrante de San Jacinto, has recently been taken over under lease and bond by J. O. Stewart and associates of Los Angeles. The property was operated in 1887 by the San Jacinto Tin Company, an English corporation. The developments consisted of two incline shafts, 272 feet apart, located on Cajalco Hill, which were sunk on a vein which strikes N. 45° E., dip 65 degrees northwest, and is said to have had an average width of 6 feet. A tunnel was driven on this vein which intersected one of these shafts at a depth of 45 feet, and the other shaft at a depth of 100 feet. A number of parallel veins occur in hornblende-biotite granite, having a general course of northeast and southwest. The belt in which these veins occur, carrying values in tin, is about 4 miles in length, and about 2 miles in width, the deposits being confined to the granitic rocks in this area. Two varieties of tin ore occur in the district. The yellow, occurring in thin layers in an uncrystalline form, and the brown oxide of tin.

The deposit is fully described in the XIth Report of the State Mineralogist, by H. W. Fairbanks, and also in the XVth Report, pp. 547-550, by F. J. H. Merrill.

MOLDING SAND.

Jurupa Molding Sand Deposit is situated in Sec. 29, T. 2 S., R. 5 W., on the Evans Ranch, about one quarter of a mile northwest of Jurupa Station on the Salt Lake Railroad, and on the south bank of the Santa Ana River, within the city limits of Riverside. The deposit is being developed by H. E. Blood, of 917 Citizens National Bank Building, Los Angeles, who has a lease on 20 acres.

The deposit is a fine-grained, sandy loam, and is from 6 to 20 feet thick, covering an area of 20 acres. It is stated that 90% of the sand will pass through 100 mesh screen.

Equipment consists of 18" belt conveyor, 20 feet long, and mesh shaking screen. About ten cars of screened sand is being shipped to Los Angeles. Two men are employed.

San Bernardino County.

CLAY.

Pacific Clay Deposit is located in Hart Mining District, which is situated in the extreme northeast corner of San Bernardino County, near the Nevada-California line. The deposit is being developed by the Pacific Sanitary Manufacturing Company of San Francisco.

GOLD.

Belmont Mine is located in the Goldstone Mining district, 34 miles N. E. of Barstow. Elevation, 3700 feet.

Owners: Belmont Mining Company, Dr. W. W. Ramsey, president; George I. Drumm, secretary; Morgan Berggreen, superintendent. Holdings consist of 21 claims, totaling 240 acres. The present development work is confined to the Belmont group, consisting of five claims.

Two parallel quartz veins occur in shales and schist, strike N. 60° W., dip 35 degrees to northeast. These veins vary in width from 12 inches to 3 feet. The ore is free milling with some pyrite and chalcopyrite. Developments consist of a number of shafts sunk to depths of 50 to 300 feet on the different veins. The main shaft is 300 feet deep, sunk on incline of 35 degrees. Drifts have been driven on the vein for a short distance on the 100', 200′ and 300' levels. Present work confined to drifting on the vein on the 300 foot level; here the vein is 3 feet wide, and is said to average $20.00 per ton. Some high grade ore was shipped from the property during 1916 and 1917.

Equipment consists of 15-h.p. Fairbanks-Morse gas engine hoist (71′′ x 6′′), Chicago pneumatic compressor, air drills, blacksmith shop and cars. The property adjoins the Goldstone Mining Company property, on the southeast. Three men employed.

Goldstone Mine is situated in the Goldstone Mining District, 33 miles northeast of Barstow. Elevation, 3600'.

Owners: Goldstone Mining and Milling Company, J. M. Schofield, president; G. Marston Leonard, secretary, Boston, Mass.

Holdings of the company consist of 22 claims, divided into five groups known as Goldstone, Golden State, Gold Dollar, Big Drum and Lucky Find. A vein of quartz occurs on the contact of crystalline limestone and shale. The vein has a course of north and south to northwest and southeast. Dip 40 degrees west. Average width of 4 feet. Ore shoot developed was 150 feet in length and 4 feet wide. Since XVth Report of the State Mineralogist, the company sunk a 2-compartment vertical shaft to depth of 300 feet, at 50 feet below the collar, cut the vein, and for the remaining distance the shaft is in the limestone footwall. No crosscuts were run to intersect the vein from this shaft. A number of incline shafts were sunk along the outcrop to depths of 40 feet, south of the main shaft. An open cut 150 feet in length was also made on the vein. Most of the ore mined came from this open cut. 100 tons of ore milled is said to have averaged $40.00 per ton. One car of ore shipped by the company to Selby Smelter averaged $70.00 per ton.

The property was operated from 1916 to 1918, when operations were suspended.

Equipment consists of 25-h p. single drum gas engine hoist, 12" x 12" Fairbanks-Morse compressor, driven by 50-h.p. gas engine, head frame, blacksmith shop, assay office and buildings. Two men employed.

Bibl.: State Mineralogist Report XV, pp. 805-806.

Massen Group of Mines, consists of 87 claims, located on the northwest slope of the Alvord Range of mountains, in Sec. 26-35, T. 12 N., R. 3 E., 32 miles northeast of Barstow.

Elevation, 2400 to 3100 feet.

Owner: J. H. Massen and associates of Barstow.

A number of roughly parallel narrow quartz veins occur in the granite. These veins have a general course of northwest and southeast, with dips varying from 40 to 60 degrees to southwest. The veins vary in width from 2 inches to 2 feet. These narrow veins of quartz usually occur along fault fractures in the granite, and as a rule the fracture is filled with a diorite-porphyry, with quartz occurring either

on the hanging or footwall of the fissure. The ore is oxidized quartz, showing free gold.

Developments consist of a number of shallow shafts and tunnels on the different veins. It is stated that ore shipped from the Gem State Group averaged $50.00 per ton. Two men employed.

Olympus Mine, situated on the south slope of the Paradise Range of mountains, at elevation of 2400 feet, 22 miles north of Daggett.

Owner: Olympus Gold Mining Company, S. E. Bagley, president; M. W. H. Williams, secretary; H. Galerone, superintendent. Offices: 508 Alvarado Street, Redlands, California.

Since the data in XVIIth Report of the State Mineralogist was published, the company has been driving a crosscut tunnel to cut the vein at 200 feet below the collar of the incline shaft. At an elevation of 2200 feet, the tunnel has been driven 75 feet northwest, then 325 feet west to vein, with a drift north on the vein 100 feet. In this north drift, the vein has a width of 4 feet. The vein filling being quartz and porphyry, which pans well in free gold. The company proposes to continue drifting on the vein until shoot of ore encountered in upper workings is developed. Four men are employed.

SILVER.

Rand District.

California Rand Silver, Inc. The company's report of operations for the year ending September 1, 1923, states that the outstanding feature of the mining enterprise today is the practical demonstration that the property can be operated with the market price of silver from 60 to 65 cents per oz. The company has been able to pay its regular monthly dividends of two cents a share, requiring a distribution of $25,600, and has at the same time increased its surplus by $135,000.

The original mill, with a capacity of 150 tons, was enlarged during the year to 400 tons capacity. For the year, there were 16,161 feet of underground development. Up to September 1, 1923, a total of 44,455 feet, or 8 miles of underground development work has been done since the opening of the mine. Aside from development work on other shafts, shaft No. 1 and No. 2 produced 134,000 tons of rock during the year, segregated as follows: