Clark County, formerly mined at Drumlummon mine, Marysville. Missoula County, Pleasant View and Slate Creek prospects, carries gold and silver. Silver Bow County, ore of minor importance in Butte mines in copper and silver veins.

Thorianite. Madison County, known at Norris, not mined.

Thorium. See Monazite and Thorianite.

Vanadinite. Beaverhead County, reported 27 miles northwest of Dillon in Rothschild mine.

Vanadium. Silver Bow County, in the Mountain View and other mines at Butte; form of vanadium mineral unknown. See also Egirite. Volcanic ash. Gallatin County, deposits suitable for use as abrasives and polishing powder in vicinity of Bozeman. Granite County, South Drummond. Meagher County, at Castle Mountain. Missoula County, north of Missoula. Ravalli County, at many places on the east side of Clark Fork. Also in Silver Bow and other counties.

Wad.

Jefferson County, with limonite in granite about 6 miles north of
Wickes station, not mined. Silver Bow County, with silver ores of
Butte district.

Wood (petrified). Found in many localities but not agatized.
Wurtzite. Silver Bow County, Gagnon mine, Butte.

NEBRASKA.

Abrasive. See Diatomaceous earth and Pumice.

Agate (moss). Keith, Scotts Bluff, and Sioux counties; cut for jewelry. Cement material. Carboniferous limestone and shale, suitable for cement material, outcrop in southeastern part of State in Cass, Douglas, Gage, Johnson, Lancaster, Nemaha, Otoe, Pawnee, Richardson, and Sarpy counties; not utilized. Cement formerly made from Carboniferous rock at Beatrice, Gage County. Cretaceous chalk rock and underlying shales, suited to the manufacture of cement, outcrop extensively in northeastern Nebraska along Niobrara and Missouri rivers in the following counties: eastern Boyd, Cedar, Dixon, Dakota, and northern Knox. Likewise along the southern line of Nebraska in the Republican Valley in the following counties: Franklin, Nuckolls, southern Harlan, and Webster. The cement material of the Cretaceous in Nebraska belongs essentially to the Niobrara formation, although a chalky layer (Inoceramus zone) about 20 feet thick constitutes the upper part of the Greenhorn limestone. A large plant is at Superior, Nuckolls County.

Chalcedony. Gage County, common vein filling in the Badlands. Chalk. The Greenhorn limestone at Hebron, Thayer County, and the Niobrara formation of Knox County, notably at the town of Niobrara, furnish considerable quantities of building material. The chalk rock of these formations is soft enough to be sawed into blocks when "green" (fresh from the quarry); on drying it becomes harder and has good lasting qualities. The chalky Greenhorn rock of Endicott, Jefferson County, and at Pleasant Hill, Saline County, used to be burned into lime for local consumption.

Clay (brick). The great bulk of ordinary building and hollow brick is manufactured from loess and alluvium. The loess is found over about half the area of the State, but in many places it is poor in clay. Brick and tile made in the following counties: Adams, Antelope, Box Butte, Boyd, Buffalo, Burt, Butler, Cass, Cedar, Clay, Cuming, Dixon, Dodge, Douglas, Fillmore, Furnace, Gage, Greeley, Hall, Hamilton, Howard, Jefferson, Kearney, Knox, Lancaster, Loup, Madison, Nance, Nemaha, Nuckolls, Otoe, Pawnee, Phelps, Platte, Polk, Redwillow, Richardson, Saline, Saunders, Scotts Bluff, Seward, Sherman, Stanton, Thayer, Washington, Wayne, Webster, and York.

Clay (fire). Occurs in Pennsylvanian ("Coal Measures") in southeastern part of State.

Clay (kaolin). Cherry County, Prince Creek.

Clay (pottery). Cass County, has been dug at Louisville. Jefferson County, coarse pottery clay at Endicott. Washington County and elsewhere in southeastern Nebraska.

Coal (bituminous). Cass, Johnson, and Otoe counties, Nuckolls bed 8 to 18 inches thick, worked for local use. Nemaha County, working mine at Honey Creek, 4 miles south of Peru, in bed 33 inches thick. Otoe County, bed 15 inches thick in a boring at Nebraska City. Pawnee County, beds at Du Bois, Friezes Mill, and Turners Branch worked intermittently. Richardson County, has been mined at Rulo, and a bed 18 to 30 inches thick has been opened and worked for local use in southwest corner of county.

Coal (lignite). Dakota County, mined for local use near Homer. Dixon County, in bluffs near Ponca.

Diatomaceous earth. Greeley County contains the best beds. Thomas County,

deposit of several acres near Thedford. Wheeler County, number of beds on Cedar Creek. Occurs in Blaine, Hooker, and other counties. Small quantity formerly sold for polishing powder.

Flint. Gage County, quarried and crushed for ballast at Blue Springs and Wymore.

Gold (placer). Occurs in sands of Platte River and in glacial drift; of no

importance.

Halite. See Salt.

Infusorial earth. See Diatomaceous earth.

Limestone (building). Cass County, quarried at Cedar Creek, Louisville, and Meadow. Sarpy County, Nehawka and Weeping Water. Cheyenne County, Sidney. Gage County, Blue Springs, Holmesville, and Wymore. Greeley County, Scotia. Jefferson County, near Fairbury and Endicott. Johnson County, Elk Creek, Graf, and Tecumseh. Lancaster County, Roca. Nemaha County, Auburn, Brock, Glen Rock, and Johnson. Otoe County, Syracuse and Nebraska City. Pawnee County, Table Rock. Sarpy County, La Platte, Richfield, and Springfield.

Limestone (crushed stone). Cass County, quarried at Cedar Creek, Louisville, and elsewhere. Cheyenne County, Sidney. Gage County, Holmesville, Rockford, and Wymore. Nemaha County, Auburn, Brock, and Johnson. Limestone (flux). Cass County, quarried at Nehawka.

Lithographic stone. Otoe County, occurs near Syracuse, has not proved of commercial quality.

Ocher. Known in many places in northeastern counties on Platte River and along Republican River; was mined at Indianola, Redwillow County. Widely distributed. On Loup River and its tributaries; on the Logan; along tributaries at headwaters of Elkhorn, Blue, and Stinking rivers; not utilized.

Peat.

Pumice. Produced in Furnas County; Harlan County, Orleans; Holt County, Atkinson; Jefferson County, Endicott; Lincoln County, Ingham; and in other counties; used as an abrasive.

Road metal. Cass County, gravel in Platte Valley and in glacial drifts, pits near Louisville. Gage County, large supply of flint, quarried in vicinity of Wymore and Blue Springs.

Salt (common). Previous to development of Kansas salt beds salt was made in considerable quantity in southeastern Nebraska from water of salt springs and deep wells. No longer produced, but artesian flow of salt water is used at Lincoln in sulphosaline baths. Sand (building). Principal pits are at the following places: Antelope County, Oakville. Buffalo County, Ravenna, Kearney. Burt County, Tekameh. Cass County, Cedar Creek, Louisville. Cedar County, Hartington. Colfax County, Schuyler. Custer County, Ansley, Mason City, Sargent. Douglas County, Omaha, Valley. Dodge County, Fremont. Fillmore County, Geneva. Gage County, Beatrice. Hall County, Grand Island. Platte County, Lindsay. Polk County, Atkinson. Richardson County, Falls City, Salem. Sarpy County, Meadow. Saunders County, Ashland. Many small pits widely scattered through State. Dredges taking sand from lower Platte at Ashland, Cedar Creek, Louisville, Fremont, Meadow, Valley, and Oreapolis. Forty sand-shipping stations in State produced in one year 40,000 cars, equal to train over 300 miles long. Cass County is largest producer.

Sand (molding). Adams County, dug at Erickton.

Sand and gravel. Pits supplying local demand are widely distributed. Cass County, large production from Cedar Creek. Jefferson County, dug 2 miles west of Fairbury; shipped for cement, plastering, etc., also dug near Kesterson and elsewhere.

Sandstone. Cass County, quarried at Louisville. Cherry County, occurs at Valentine. Dawes County, Chadron. Greely County, Scotia. Nemaha County, Brownville. Sarpy County, Springfield.

Turquoise. Brown County, three stones, probably variety known as odontolite, have been found.

Volcanic ash. Abundant throughout the central and western parts of the State; quarried in Furnas, Harlan, and Lincoln counties.

NEVADA.

Alum (kalinite). Esmeralda County, prospected by roadside about 10 miles north of Silver Peak.

Alunite. Clark County, large deposit 32 miles southeast of Las Vegas. Esmeralda and Nye counties, abundant in volcanic rocks and with ores in Goldfield district. Mineral County, Bovard district, 17 miles south of Rawhide and 20 miles northeast of Thorne, as veins or tabular sheets, which have a maximum width of 2 feet, in volcanic rocks, at the Gold Pen mine, and in limestone in Valley View prospect, a mile south of the Gold Pen mine. Not utilized.

Anglesite (sulphate of lead). Clark County, mined with oxidized zinc ores at Goodsprings. Eureka County, important mineral in oxidized ores at Ruby Hill and in Eureka district, silver bearing.

Anhydrite. Clark County, Arden. Lyon County, Ludwig mine and Moundhouse.

Annabergite. Humboldt County, important constituent of ore at Lovelock nickel mine, Cottonwood Canyon, Pahute Range.

Antimony. See Bindheimite, Goldfieldite, Jamesonite, Polybasite, Stibiconite, and Stibnite.

Argentite (silver glance). Churchill County, Fairview district, Nevada Hills, and other mines; Wonder district, Nevada Wonder, Jack Pot, and other mines. Elko County, at Columbia. Humboldt County, at Rosebud, Rochester district. Lander County, at Cortez. Nye County, important silver mineral of Tonopah district. White Pine County, Cherry Creek district. Arsenic. Humboldt County, massive native near Rochester, with traces of bismuth. Washoe County, native arsenic, in considerable quantity, occurs at a prospect a few miles south of Pyramid Lake. See also Arsenopyrite and Mimetite.

Arsenopyrite. Elko County, silver ore at Tuscarora. Eureka County, Ruby Hill, Eureka district. Humboldt County, with pyrite and quartz at Auld Lang Syne mine near Chafey. Washoe County, at Galena.

Asphalt. Eureka County, stringers and lenses up to 18 inches wide filling fractures in Carboniferous rocks 15 miles south of Palisade.

Axinite. Elko County, in the Contact district at the Brooklyn, Alice, Zetta, Blanchard, and other mines and prospects on the contact of granodiorite and limestone.

Azurite.

Esmeralda County,

Elko County, with silver ore in Mountain City. sparingly in Goldfield district, Montezuma and Cuprite mines. Eureka County, small quantity at Ruby Hill, Eureka district, and in Mineral Hill district. Humboldt County, small quantity in Red Butte copper district and Lovelocks cobalt-nickel mine in Cottonwood Canyon, Pahute Range. Lyon County, in Mason Valley mine, Yerington copper district, and other localities.

Barite. Clark County, Yellow Pine district, Boss, and other mines. Ormsby County, mined at Barium mine. Elko, Esmeralda, Eureka, Humboldt, Lander, Mineral, and Nye counties, gangue mineral in many veins. Esmeralda County, abundant with ore in Sandstorm and Kendall mines, Goldfield district. Humboldt County, a common gangue mineral in Humboldt Range.

Basalt. Churchill County, abundant in Stillwater or Carson Sink Range southeast of Stillwater and Fallon; also in northern part of State, as near Jarbidge, in Elko County.

Bindheimite. Esmeralda County, 15 miles east of Thorne. Humboldt County, Rochester district, in Nenzel Hill and Packard ores.