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Marin County, albite veins are common in the schists. Mariposa County, orthoclase occurs with black tourmaline and molybdenite in the granites of the Yosemite Valley. Mono County, orthoclase occurs in pegmatite veins in the Blind Spring district. Monterey County, orthoclase is mined at Chualar for pottery; large phenocrysts occur at Pacific Grove and Cypress Point. San Bernardino County, orthoclase is mined at Saratoga Springs, veins occur in the mountains in the northeastern part of the county, massive red orthoclase occurs near Manvel. San Diego County, occurs in quantity at Dehesa and Lakeside; large veins of acid pegmatite, consisting of albite, orthoclase, and microcline, occur in diorite at Pala, Mesa Grande, Rincon, and Ramona, as well as northward into Riverside County. Shasta County, veins of orthoclase occur on Tom Neal Mountain. Tulare County, orthoclase occurs near Porterville and Visalia and at Three Rivers. Tuolumne County, large crystals of orthoclase occur on Sullivan Creek.

Fluorspar (fluorite). Inyo County, as gangue mineral with argentiferous galena in the Cerro Gordo, Darwin, and other districts. Los Angeles County, Glendora, Felix mine near Azusa, and on Santa Catalina Island, with galena and chalcopyrite. Mono County, in Ferris Canyon on the east slope of the Sweetwater Mountains. San Diego County, Palomar Mountain, Oak Grove.

Fuller's earth. Calaveras County, dug at Burson. Kern County, reported at
Bakersfield and Famosa. Kings County, dug at Huron. Monterey

County, Bradley. San Bernardino County, mined 14 miles northeast of
Barstow. Solano County, dug at Vacaville.

Gabbro (norite). Placer County, dark, coarse-grained, quarried near Penryn, for building stone. San Diego County, at Dehesa.

Galena. Inyo County, mined in Cerro Gordo, Chloride Cliff, Darwin, Independence, Lookout, and other districts, argentiferous. Mono County, argentiferous galena forms important ore bodies, common in Bodie, Benton, and Lundy districts, and at the claims on the Sweetwater Range. Placer County, abundant at Booth, Gold Blossom, and other mines in Ophir region; argentiferous. San Bernardino County, argentiferous galena with lead carbonate is common in the Silver Mountain, Silver Reef, Calico, and Barstow districts. Shasta County, occurs at most of the copper mines. Also in Butte, Mono, Plumas, and other counties. Ganister. San Bernardino County, 2 miles southeast of Siam, fine deposit. Garnet. Alpine County, Hope Valley, fine green grossularite reported. Butte County, Cherokee, red and brown garnet common in the gold washings. Calaveras County, almandite occurs at Bald Point, Mokelumne River; occurs also in the gravel at San Andreas. Del Norte County, common in the sands at Crescent City, Gilbert Creek, and Smith River. Eldorado County, grossularite in copper ore in Rodgers mine in eastern part of county, in good crystals 9 miles southeast of Placerville, massive at Pilot Hill, common near Georgetown. Fresno County, occurs at Fresno Flat, Grub Gulch, and Fort Miller; grossularite, 35 miles east of Selma. Humboldt County, at Gold Bluff and Orleans. Inyo County, crystals and massive garnet occur in the Coso and Inyo mountains; fine large crystals of grossularite occurred with datolite and greenish-brown vesuvianite at San Carlos. Kern County, massive near Hot Springs, between Havilah and Kernville, and on summit between Walker Basin and Havilah. Lassen County, common at Diamond mine. Los Angeles County, in sands at Mount Meadows. Marin County, andradite crystals are common in the schist of the Tiburon Peninsula. Mariposa County, massive brown alman

Gas.

dite occurs on Mount Hoffman, good crystals at the junction of Moore Creek and Mokelumne River. Mendocino County, common in the sands at Fort Bragg. Monterey County, in the sands of the Los Burros district; uvarovite has been found coating chromite, and trautwinite also occurs. Nevada County, in concentrates of Rough and Ready district; with wollastonite at Grass Valley. Orange County, a constituent of the schists near Anaheim. Placer County, essonite at Deer Park and on American River near Towle; uvarovite has been found on chromite near Auburn. Plumas County, Good Hope mine and in sands at Nelson Point. Riverside County, essonite in tourmaline district near Coahuila, in the concentrates at Holcomb; occurs massive at the Santa Ana tin district; hyacinth or essonite at Hemet; abundance of grossularite and some andradite occurs in the crystalline limestone at Crestmore, associated with vesuvianite, diopside, and wilkeite. San Benito County, fine green crystals were found coating chromite and rhodochrome at New Idria. San Diego County, essonite mined for gems at Hercules, Lookout, Prospect, Little Three, and Surprise mines in Ramona district; fine crystals of transparent essonite occur in the tourmaline districts of Mesa Grande, Pala, and Rincon, and these have been extensively cut into gems under the name of hyacinth; essonite also occurs about 10 miles east of Jacumba Hot Springs with vesuvianite and quartz; garnet in the Julian district and at Ballina; spessartite was reported from the Mesa Grande, and fine granular red specimens at Rincon. Santa Barbara County, common in the sands at Point Sal. Santa Clara County, a constituent of the eclogites of Calaveras Valley. Shasta County, uvarovite has been found in chromite on Shotgun Creek; red garnet on Round Mountain; bands of garnet mixed with pyroxene on McCloud River on contact between diabase and Carboniferous limestone. Siskiyou County, in sands at Cecilville and on Klamath River. Sonoma County, large masses occur near Petaluma. Trinity County, uvarovite has been found at Carrville. Tulare County, white massive grossularite was found in the northwest corner of the county; essonite in good crystals occurs at Three Rivers; topazolite was found at the Old Soldier mine, Drum Valley, 12 miles northeast of Visalia; aplome, a manganese andradite, was found near Visalia. Tuolumne County, with epidote at Mutton Ledge; in schist on Jarvis ranch and at Soulsbyville.

See Natural gas.

Gilsonite (uintaite). Santa Barbara County.

Glauberite. San Bernardino County, prominent in the borax deposits at Searles Lake.

Gold. Gold is the predominant metal produced in 307 of the 413 mining dis

tricts of the State. It occurs in every county and is now produced in more than half of them. It was brought in with the intrusion through the Mesozoic sediments of the mass of granitic rock which forms the core of the Sierras. The annual production of gold is about $20,000,000, of which about $9,000,000 comes from placers. Gold (lode). The mining districts in which gold derived from lodes is the chief metal produced are too numerous to mention. They can be found in United States Geological Survey Bulletin 507, Mining districts of western United States. For gold-bearing minerals see Amalgam, Calaverite, Electrum, Petzite, and Sylvanite.

Gold (placer). Gold derived from placers has been the principal metal produced in the following districts, many of which, once great producers, have long been idle: Amador County, Lancha Plana, Middle Bar, Oleta, Pine Grove,

and Volcano. Butte County, Bangor, Cherokee, Magalia, Nimshew, and Oroville. Calaveras County, Jenny Lind, Mokelumne Hill, Railroad Flat, and Vallicita. Del Norte County, Crescent City. Eldorado County, Indian Diggings, Newtown, and Pacific. Humboldt County, Blocksburg, China Flat, Hoopa, Klamath, Orick, Orleans, and Weitchpec. Kern County, Goler, Red Rock, and Summit. Los Angeles County, Arrastre Canyon. Mono County, Dogtown Diggings. Nevada County, Lowell Hill, North Bloomfield, and You Bet. Placer County, Damascus and Ralston Divide. Plumas County, Elizabethtown, Laporte, Lights Canyon, Sawpit Flat, and Spanish ranch. Sacramento County, Folsom. San Luis Obispo County, La Panza. Shasta County, Bayles, Jerusalem Creek, and Redding. Sierra County, American Hill, Brandy City, Church Meadows, Eureka, and Indian Hill. Siskiyou County, Cottage Grove, Deadwood, Etna, Forks of Salmon, Gilta, Gottville, Hamburg, Happy Camp, Knownothing, O'Mears, Sawyers Bar, Somes Bar, and Summerville. Stanislaus County, Knights Ferry. Trinity County, almost every one of the 24 mining districts. Tuolumne County, Columbia. Yuba County, Brownsville, Camptonville, Marysville, Smartville, and Wheatland. Placer gold is produced in many other districts, but is subordinate to lode gold or some other metal. Granite (building). Amador County, quarried 4 miles northeast of Jackson. Eldorado County, Placerville. Fresno County, various shades blue, gray, and black granite quarried in sec. 13, T. 12 S., R. 22 E. Madera County, large quarries at Raymond. Nevada County, Grass Valley. Placer County, Loomis station, Lincoln, Penryn, and Rocklin. Riverside County, Riverside, Temecula, and elsewhere. Sacramento County, Folsom. San Bernardino County, Oro Grande and Victorville. San Diego County, San Diego, Foster, Santee, and Sweetwater. Tulare County, Porterville, Rocky Point quarry, sec. 8, T. 19 S., R. 27 E. Tuolumne County, Phoenix Lake quarry, 7 miles northeast of Sonora. Granite (crushed stone, paving stone, road material). Alameda County, quarried at Berkeley, Leona Heights, and Newark. Amador County, Jackson. Butte County, Oroville. Calaveras County, Milton (Gopher Ridge, porphyrite). Contra Costa County, Richmond and elsewhere. Fresno County, Academy (Clovis). Humboldt County, Arcata and Eureka. Imperial County, Hanlon Junction. Lassen County, Susanville. Los Angeles County, Duarte, Hollywood, and Monrovia, and stream bowlders crushed in San Fernando Valley and near Azusa. Madera County, Raymond. Marin County, San Rafael. Mariposa County, Jasper Point. Napa County, Napa. Nevada County, Grass Valley, Nevada City, Rough and Ready. Placer County, Lincoln, Penryn, and Rocklin. Plumas County, Chilcoot and Cuba. Riverside County, Corona, Elsinore, Perris, Riverside and West Riverside, and Temecula station. Sacramento County, Fairoaks and Folsom. San Benito County, Logan. San Bernardino County, Crucero, Declez, Halleck, Hesperia, and Victorville. San Diego County, Campo, Dehesa, Escondido, Foster, Helix, San Diego, and Santee. San Francisco County, San Francisco. San Luis Obispo County, Port San Luis (Port Harford). Santa Clara County, San Jose. Solano County, Cordelia. Sonoma County, Allison, Santa Rosa, and Sonoma. Tulare County, Porterville.

Graphite (plumbago, black lead). Mendocino County, has been quarried 10 miles east of Point Arena, in sec. 8, T. 12 N., R. 15 W. Sonoma County, quarried 10 miles south of Healdsburg for mineral paint. San Bernardino County, 15 miles from East Highlands, in San Bernardino Mountains.

Tuolumne County, in large foliated and dull earthy masses in the limestones near Columbia, where it was formerly mined. Undeveloped deposits are reported near Los Angeles, Santa Cruz, and elsewhere. Gypsum. Widely distributed; reported from Butte, Colusa, Fresno, Kern, Los Angeles, Riverside, San Benito, San Bernardino, San Luis Obispo, Santa Barbara, Tulare, and Ventura counties. Butte County, at St. Clair mine. Fresno County, quarried in Coalinga and Mendota, on the low hills on the north and south sides of Tumey Gulch, about 18 miles southwest of Mendota, and along Cantua Creek. Inyo County, occurs fibrous at Clarks Fork, Amargosa River, in the Cerro Gordo district, and at Tecopa. Kern County, near McKittrick and elsewhere in west side of oil field, Bakersfield, and Dudley, on Cottonwood Creek about 16 miles east of Bakersfield, in the bed of old Kern Lake, about 20 miles southwest of Bakersfield, and 5 miles from Connor, on the shores of Buena Vista Lake; small deposits near Cane Springs. Kings County, deposits occur on the range of low hills southeast of Dudley and on Kettleman Plains, about 5 miles north of Dudley and 5 miles northeast of Dudley. Lake County, selenite on Robinson's ranch; small amounts are also found at Sulphur Bank, Clear Lake. Lassen County, large slabs of selenite near Susanville; observed at Honey Lake. Selenite crystals are abundant in the diatomaceous shale throughout the Diablo Range, in the western part of Fresno, Merced, and Stanislaus counties, particularly notable on the west side of San Joaquin Valley north of Little Panoche Valley, where they form veins 18 inches to 2 feet in width. Los Angeles County, Palmdale and Los Angeles; gypsum occurs in Charley Canyon, 12 miles north of Castiac in shale rock; in seams in bluffs at San Pedro; 2 miles north of Lang; large selenite plates have been found in Soledad Canyon. Mono County, in the Bodie district. Monterey County, northeast of King City, Bitterwater Valley, east of Lonoak. Nevada County, fibrous radiate forms occur near Truckee. Riverside County, Corona; extensive deposits occur in the Palen Mountains interstratified with limestone deposits which are thought to be extensive also occur in the Santa Maria Mountains, just west of Colorado River, near Blythe, and in the Colorado Desert, about 12 miles east of Mecca. San Benito County, outcrops occur along the Coast Range in many places. San Bernardino County, Amboy, and in other dry lake depressions of the desert; in the lake bed south of Danby and near Kelso; at Searles Lake associated with borax; selenite occurred with colemanite in the Calico district. San Diego County, near Dos Palmas. San Francisco County, small amounts near Merced Lake. San Luis Obispo County, white bunches and veins occur on Alamo Creek, 16 miles from Santa Maria; some alabaster occurs at Arroyo Grande. Santa Barbara County, as alabaster at Casmalia and near Santa Barbara Creek, about 32 miles southwest of McKittrick, and in small amounts on Santa Rosa Island; massive gypsum was early worked at Point Sal. Santa Clara County, as selenite near Gilroy. Sonoma County, at the Geysers with sulphur and with boussingaultite. Stanislaus County, selenite near Modesto. Ventura County, in small amount on Dennison ranch, 3 miles east of Nordhoff; selenite in Lockwood Valley.

[blocks in formation]

Halloysite. Inyo County, banded white and brown occurs at the Cerro Gordo mine and the variety lenzinite is reported from Owens Valley. Lassen

County, at Hayden Hill. Mono County, Detroit mine near Mono Lake.
San Diego County, at Pala, massive pink occurs with the gem tourmaline.
Ventura County, the variety lenzinite.

Halotrichite. Alameda County, in the Eureka tunnel near Livermore.
Hanksite. Common in the borax lake districts. Inyo County, found with
borax in the sinks of Death Valley. San Bernardino County, Searles
Lake.

Hematite (red iron ore). Large deposits await development. Alameda County, massive red earthy, mixed with limonite, forms the capping of the pyrite body at Leona Heights. Alpine County, common at Monitor. Amador County, large deposit in Ione formation, 2 miles west of Ione, also in Calaveras formation. Butte County, common in the gravels at Magalia, Butte Creek, Oroville, and Stirling City. Calaveras County, at Douglas Flat, Murphy, Wallace, and Quail Hill. Del Norte County, at the Kelsey tunnel, 14 miles southeast of Crescent City. Eldorado County, Pioneer mine; heavy masses at Shingle Springs, in the gravels at Diamond Springs, Green Valley, Virner, and other places. Humboldt County, large vein 3 miles south of Centerville. Inyo County, massive specular, at the Defiance mine, occurs also in Owens Valley. Kern County, at Kane Springs and Ricardo. Lake County, massive, near Red Glenrock, in Cobb Valley. Madero County, Minarets; one of the largest deposits of magnetite-hematite occurs here; much of this ore is martite. Marin County, massive specimens at the Maillard ranch, about 2 miles southwest of San Geronimo, Mono County, common in the Blind Springs district. Napa County, massive red near St. Helena, massive, at White Sulphur Springs and Placerville. Nevada County, with gold at Meadow Lake; minor deposits at Indian Springs and at Newton. Orange County, at Fullerton. Placer County, with magnetite at the Hotaling deposit about 6 miles north of Auburn, small amounts at Clippergap, Red Hill, and near Weimar. Plumas County, with magnetite near Crescent Mills, at Mumfords Hill, Lights Canyon, Genesee Valley, and Nelson Point. Riverside County, Eagle Mountain, derived from the extensive deposit of magnetite. San Bernardino County, near Kane Springs, Cima, Silver Lake, and Leastalk; at Dale, on Iron Mountain in the Kingston Range, Newberry on Providence Mountain, and in prospects in Cave Canyon area, north of Scott Station, and elsewhere in the county are deposits of massive hematite after magnetite or martite. Shasta County, abundant; the Ready or Pit River deposit has been utilized at the electric smelting furnace at Heroult; the cappings of the pyrite beds of this county are thick deposits of earthy hematite and limonite. Sierra County, found in small quantity. Siskiyou County, in the gravels of Shasta River. Sonoma County, large deposit at Noble's ranch, near Fort Ross, and near the west fork of Gualala River. Stanislaus County, foliated near La Grange. Tehama County, at Beegum. Trinity County, in the sands at Trinity Center. Yuba County, in the sands of the Brownsville district.

Hessite. Calaveras County, old Stanislaus mine on Carson Hill. Eldorado County, at Georgetown. Kern County, with silver minerals at Amalie mine. Nevada County, with pyrite, galena, and native gold at the Nevada City mine. Shasta County, in the Shearer and Rattler mine, 3 miles from Redding. Sierra County, in the Golden King mine on Kanaka Creek, near Alleghany. Tuolumne County, in the old Reist mine on Whiskey Hill and in the Jumper and Bonanza mines near Jamestown.

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