Silver.

The predominant metal produced in the following districts: Blaine County, Antelope, Lava Creek, Sawtooth, and Warm Springs. Boise County, Banner. Boundary County, Kootenai, 40 miles northwest of Iola. Custer County, Bay Horse and Sheep Mountain. Kootenai County, Lakeview and Medimont. Lemhi County, Bluewing and Parker Mountain. Owyhee County, Carson and Flint. Silver is of only less importance in many other districts. See also Argentite, Cerargyrite, Freibergite, Polybasite, Proustite, and Pyrargyrite.

Silver (native). Shoshone County, associated with cerusite in Last Chance mine, Coeur d'Alene district; rare; and in oxidized portion of many lodes in the State but nowhere is an abundant ore.

Specularite. Idaho County, at Peacock claim, Seven Devils district. Sphalerite (zinc blende). Blaine County, mined for gold and silver at Silver King and Vienna mines. Boise County, Gold Hill, Good Friday, Checkmate, and other veins in Willow Creek district. Custer County, occurs with lead-silver ores. Elmore County, small quantity in Neal district. Idaho County, Monte Cristo, and other mines in Buffalo Hump district, and Little Giant, Rescue, and other mines in Warren district. Lemhi County, occurs with lead-silver ores. Owyhee County, Silver City and South Mountain. Shoshone County, associated with galena, etc., in some mines in the Coeur d'Alene district; Interstate-Callahan mine, Ninemile district, third largest producer of zinc sulphide in the world. Washington County, Mineral district.

Stibnite.

Blaine County, occurs in Wood River district. Boise County, occasionally found at Gold Hill and near Idaho City. Elmore County, occasionally found in the Neal district. Shoshone County, has been mined in Gorge Gulch, 1 mile from Burke, where it carries gold, and from three shipping mines at Price Creek. See also Antimony.

Sulphur. Bannock County, sulphur springs deposits near Soda Springs; has been mined.

Tetrahedrite (gray copper ore). Has been mined in the following localities: Blaine County, intergrown with galena in number of mines in the Wood River district. Custer County, great deposits in Bay Horse district. Elmore County, small quantity in Banner mines. Idaho County, mined for gold and silver at Big Buffalo, Jumbo, and other mines in Big Hump district, and at Little Giant, Rescue, and other mines in Warren district. Owyhee County, small quantity at Flint, Silver City. Shoshone County, at some lead-silver mines in the Coeur d'Alene district. Washington County, at Mineral silver mines, Blue Mountain gold belt. Thorium. See Monazite.

Tin. See Cassiterite.

Tungsten. See Ferberite, Hübnerite, Scheelite, and Wolframite.
Uranophane. Boise County, Carterville.

Vivianite. Owyhee County, Trade Dollar and Black Jack mines, Florida
Mountain, near Silver City.

Wood (opalized). See Opalized wood.

Wolframite. Blaine County, at head of Fish Creek, 7 miles west of Martin. Custer County, Pahsimeroi River, reported. Lemhi County, at Patterson Creek, with hübnerite in quartz; Big Eight Creek, tungsten ore reported. Zinc. See Sphalerite.

Zircon. In Clearwater region and elsewhere in black sand and certain granitoid rocks.

ILLINOIS.

Cement material. Large deposits suitable for development. Those developed are: Clark County, "Lower Magnesian" (Ordovician) limestone mined for natural cement near Utica. Cook County, blast-furnace slag and crushed limestone used for Portland cement at Chicago. La Salle County, Pennsylvanian ("Coal Measures ") limestone quarried for Portland cement material at Oglesby and east of La Salle. Lee County, "Trenton" limestone quarried at Dixon for Portland cement. Cerusite (carbonate of lead). Jo Daviess County, secondary mineral of leadzinc mines.

Clay (brick). Clay suitable for brick making is dug at one or more places in practically every county in the State. The value of common brick produced in Illinois in 1914 was $4,898,698. Total clay products were valued at over $13,300,000.

Clay (fire). Dug in Alexander County, at Elco. Calhoun County, Golden Eagle. Fulton County, Avon. Greene County, 24 miles northeast of Whitehall and at Drake. Grundy County, at Coal City. La Salle County, near Streator, Utica, Deer Park, and Ottawa. Livingston County, 14 miles south of Streator. McDonough County, 1 mile north of Macomb, Colchester. Pope County, on branch of Robustle Creek. Rock Island County, at Carbon Cliff. Scott County, Alsey. Union County, Kaolin and Jonesboro. Warren County, Monmouth. Winnebago County, Rockton. Also in several other counties.

Clay (kaolin). Pope County, has been dug at Raum. Union County, dug at Kaolin.

Clay (paper and medicinal). Pulaski County, occurs at Pulaski. Ogle County, at Adeline.

Clay (pottery). Pits in Greene County, at Drake (ball clay also dug). Jersey County, Fieldon. La Salle County, Lowell. Massac County, Round Knob. McDonough County, Colchester. Pulaski County, Yates Landing and near Lockharts Landing. Rock Island County, Carbon Cliff. Warren County, Monmouth.

Clay (sewer pipe). McDonough County, Macomb.

Clay (terra cotta). Cook County.

Coal (bituminous). Nearly three-fourths of the State is underlain by productive coal measures, the total area being estimated at 35,600 square miles. Fifty counties reported some coal production in 1914. Franklin and Williamson counties produced over 7,000,000 short tons each; Sangamon County exceeded 5,000,000 tons; and four other counties, Macoupin, Madison, St. Clair, and Saline, produced over 3,000,000 tons each. The total production of the State in 1914 was 57,589,197 short tons, valued at $64,693,529.

Flagstone. Alexander County, Thebes. Madison County, Alton. Monroe County, Columbia and Monroe. Wayne County, Fairfield. Will County, Joliet, Twelve-mile Grove, and Wallingford. In Calhoun, Hamilton, Pike, Scott, Wabash, White, and other counties.

Fluorspar. Hardin County, mined in Rosiclare and Hicks district, at Cave-inRock, Fairview Landing, and elsewhere. Pope County, mined at Pittsburg, McClellan, and other mines.

Galena. Hardin County, occurs in small bunches in fluorspar at the Fairview mine, also in Empire mine. Jo Daviess County, occurs in numerous mines. Produced as by-product in cleaning fluorspar at Empire, Rosiclare, and other mines.

Geodes. Hancock County, abundant in shale at Warsaw.

Iron.

Lead.

See Siderite.

ren.

See Cerusite and Galena. Limestone (building). Quarried in Adams County, at Front, Jefferson, and Quincy. Boone County, Belvidere. Carroll County, Lanark, Mount Carroll, and Savanna. Clark County, Martinsville. Coles County, Charleston. Cook County, Gary, Hillside, Lagrange, Lemont, Sag Bridge, and elsewhere. Dupage County, Elmhurst. Greene County, Eldred. Hancock County, Hamilton, Nauvoo, and Niota. Harden County, Elizabethtown. Henderson County, Biggsville. Jersey County, Delhi, Elsah, and Grafton. Jo Daviess County, Elizabeth, Galena, near Woodbine, and WarKane County, Batavia, Geneva, North Aurora, South Elgin. Kankakee County, Bonfield, Essex, Lehigh, Momence, and Waldron. Kendall County, Oswego. La Salle County, La Salle. Lee County, Dixon. McHenry County, Marengo. Madison County, Alton. Monroe County, Maeystown, Millstadt Junction, and New Hanover. Montgomery County, Hillsboro. Ogle County, Lead River, Mount Morris, and Rochelle. Pike County, Valley City. Randolph County, Chester, Menard, Prairie du Rocher, and Red Bud. Rock Island County, Moline and Rock Island. St. Clair County, Belleville, Centerville station, Columbia, and East Carondelet. Scott County, Alsey. Stephenson County, Kent. Union County, Anna. Vermilion County, Fairmount. Whiteside County, Garden Plain, Rockfalls, and Sterling. Will County, Elwood, near Lemont, Joliet, Manhattan, Romeoville (mail Lockport). Winnebago County, Durand, Pecatonica, Rockford, and Winnebago.

Limestone (crushed stone). Quarried in Adams County, at Quincy. Boone County, Belvidere. Carroll County, Savanna. Cook County, Bellwood, Chicago, Summit, and elsewhere. Dupage County, Elmhurst. Hancock County, near Niota. Jersey County, Elsah and Grafton. Kane County, Batavia and South Elgin. Kankakee County, Kankakee and Momence. La Salle County, La Salle. Lee County, Dixon. McHenry County, Marengo. Madison County, Alton. Monroe County, Millstadt Junction. Montgomery County, Hillsboro. Ogle County, Rochelle. Pike County, Valley. Randolph County, Menard. Rock Island County, Port Byron and Moline. St. Clair County, Belleville, Falling Springs, and Stolle. Union County, Anna. Whiteside County, Fulton and Sterling. Will County, Elwood and Joliet. Winnebago County, Rockford and Rockton. Limestone (fertilizer). Good limestone for fertilizer occurs in Alexander County along river bluff mile south of Thebes; Coles County, near Charleston; Hardin County, Rosiclare; Johnson County, Belknap; Pulaski County, near Ullin; Union County, Anna.

Limestone (flux). Quarried in Adams County, at Quincy; Cook County, Chicago; Jersey County, Elsah; Monroe County, Millstadt Junction; Vermilion County, Fairmount; Will County, Joliet.

Limestone (lime). Quarried in Adams County, at Marblehead and Quincy. Cook County, many points in vicinity of Chicago. Jo Daviess County, Stockton. Kankakee County, Kankakee. Madison County, Alton. Monroe County, New Hanover. Rock Island County, Port Byron. Whiteside County, Fulton, Sterling. Will County, Joliet. Winnebago County, Rockford.

Natural gas. Gas was produced commercially in 1914 principally in the following counties: Cumberland, Clark, Crawford, and Lawrence counties. Usable quantities are recoverable from practically all oil pools. Shallow wells in the following counties furnish gas for local consumption: Bureau, Champaign, Dewitt, Edgar, Lee, Logan, Montgomery, Morgan, and Pike. McHenry and Randolph counties were formerly producers. There were 417 productive gas wells in the State at the end of 1914. Oil. See Petroleum.

Oil shale. See Shale.

Peat. Occurs in Boone County, Boone Township.

Bureau County, Gold Township. Cook County, in several localities. Kane County, Carpentersville, Hampshire, and Rutland. La Salle County, west of Utica. In Lee, Lake, and McHenry counties. Mason County, at Manito, produced for fertilizer filler, stock food, and for use in mud baths. Ogle County, Monroe. Stephenson County, Florence. Whiteside County, in Cattail Slough, very large body; in glacial drift 50 to 90 feet below surface, of variable quality, most commonly only a soil rich in humus; produced for fertilizer filler at Morrison.

Petroleum. The principal oil fields of the State lie in the following counties: Clark, with 60 square miles of productive territory. Crawford, 110 square miles. Cumberland, 12 square miles. Lawrence, 60 square miles. These are adjoining counties and the fields in them extend also into Coles, Jasper, and Wabash counties. There are small fields near Carlyle, Clinton County; Centralia and Sandoval, Marion County; Carlinville, Macoupin County; Litchfield, Montgomery County; Sparta, Randolph County; and Plymouth, McDonough County. The production of the State for 1914, ranking third of the States in the Union, was 21,919,749 barrels, valued at $25,426,179.

Pyrite. Hardin County, occurs in small quantities in Fairview, Empire, and other mines. Jo Daviess County, with galena and sphalerite in lead-zinc mines.

Road metal. See Limestone (crushed stone), Sand and gravel, and Sandstone. Sand (building). Dug in Alexander County, at Cairo. Bond County, Green

ville. Boone County, Belvidere. Bureau County, Buda and Wyanet. Carroll County, Savanna. Cook County, Lake Michigan, and Worth. Dekalb County, Genoa. Dupage County, Warrenville. Henderson County, Gladstone. Jo Daviess County, East Dubuque. Kane County, Aurora, Carpentersville, and elsewhere. Kendall County, Millington. Lake County, Antioch, Beach, and elsewhere. La Salle County, La Salle, Ottawa, and Wedron. Lee County, Dixon. Logan County, Kickapoo Creek and Lincoln. McHenry County, Algonquin and Cary station. Madison County, Alton. Mercer County, Keithsburg. Ogle County, Hazelhurst and Woosung. Peoria County, Peoria. Piatt County, Hammond. Rock Island County, Moline. Tazewell County, Pekin. Whiteside County, Galt and near Sterling. Will County, Joliet, Millsdale, and Plainfield. Winnebago County, Rockford and South Beloit. Dug also at other places.

Sand (fire). La Salle County, Ottawa, Utica, and Wedron.

Sand (glass). Bond County, pits at Greenville. Calhoun County, Cap au Iris. Kendall County, Millington. La Salle County, important quarries in St. Peter sandstone at Ottawa, Utica, and Wedron. Lee and Ogle counties, occurs along Rick River.

Sand (molding). Pits in Alexander County, at Cairo. Bond County, Greenville. Bureau County, Wyanet. Fayette County, Vandalia. Hancock County, Niota. Henderson County, Gladstone. Kane County, Aurora, Batavia, and Elgin. Kendall County, Millington. La Salle County, Ottawa, Utica, and Wedron. Lee County, Pitt. McHenry County, Algonquin. Madison County, Collinsville and East Alton. Jackson County, Cora. St. Clair County, East St. Louis and French village. Shelby County, Cowden. Tazewell County, Pekin. Whiteside County, Round Grove. Will County, Joliet. Winnebago County, Rockton.

Sand and gravel. Abundant and used in many counties for making concrete and for road metal.

Sandstone. Quarried in Alexander County, at Elco and Tamms. Carroll County, Lanark and Savanna. Clay County, Xenia. Fulton County, Lewistown and Marietta. Henry County, Colona. Lee County, Ashton. St. Clair County, Millstadt, Paderborn, and Smithton. Stephenson County, Pearl City. Union County, small quantity 6 miles east of Anna, Dongola. Was formerly quarried in Jackson County, Drury Creek; Peoria County, Kickapoo River; Rock Island County, Andalusia; St. Clair County; Sangamon County, west of Springfield; Warren County, Berwick and Greenbush.

Shale (brick). Used at Jackson County, Murphysboro.

throughout State.

Abundant supply

Shale (oil). Devonian; underlies much of the southern two-thirds of the State at considerable depth and thins westward.

Siderite (iron carbonate). Crawford County, Palestine. Edwards County, T. 1 S., R. 10 E. Hardin County, Sellers Landing. Schuyler County, Sugar Creek, T. 2 N., R. 1 W. Wayne County, at several localities. These and other localities in Pennsylvanian (“Coal Measures") rocks; beds from 1 to 2 feet thick, generally poor.

Silica. Sandstone, called silica in the trade, is quarried for pottery, paint, abrasives, etc., in La Salle County, near Ottawa and Wedron, and in Ogle County, near Oregon. See also Tripoli.

Silver. Hardin and Pope counties, recovered from lead concentrates in fluorspar district.

Smithsonite. Jo Daviess County, mined in Galena district.

Sphalerite (zinc blende). Jo Daviess County, principal ore of Galena district. Hardín and Pope counties, small quantities are obtained as a by-product in cleaning fluorspar.

Tripoli.

Zinc.

Alexander County, mined near McClure. Union County, large quantity mined near Anna, Jonesboro, Reynoldsville, and Wolf Lake; refineries at Jonesboro and near Wolf Lake; less abundant deposits elsewhere. See Smithsonite and Sphalerite.