Our mineral reserves

Bibliographic data

Monograph

Identifikator:: 867029366

URN:: urn:nbn:de:zbw-retromon-93011

Document type:: Monograph

Author:: Smith, George Otis http://d-nb.info/gnd/117634530

Title:: Our mineral reserves

Place of publication:: Washington, DC

Publisher:: Gov. Print. Off.

Year of publication:: 1914

Scope:: 1 Online-Ressource (48 Seiten)

Collection:: Economics Books

Usage license:: Get license information via the feedback formular.

MINERAL PRODUCTS. 39 In Arkansas flint pebbles have been noted at many places in Greene, Craighead, Poinsett, Cross, and St. Francis counties, along Crowleys Bulge, which is paralleled by the St. Louis, Iron Mountain & Southern Kailway. From 4 to T miles west of Paragould, in Greene County, where a public road crosses the highest part of the ridge, beds of gravel not exceeding 5 feet in thickness occur, usually overlain by 1 to 5 feet of loam. The gravels consist chiefly of gray, brown, and pink angular or fairly well-rounded pebbles of flint and chert, the largest 6 inches in length, and a considerable percentage of white, partly rounded to smoothly rounded pebbles of quartz, the largest 1 inch in length. An exposure on the property of Mrs. Mahala Shelton, 6 miles southwest of Jonesboro, in Craighead County, on the south side of one of the small headwater streams of L’Anguille Biver, shows from 4 to 11 feet of gravel, consisting mainly of angular to party water-worn brown chert pebbles and cobbles, reaching a maximum dimension of 1 foot. Bed, pink, gray, and black chert pebbles and a few smoothly rounded pebbles of pink and white quartz were also observed. Excavation for road material 1 mile east of Wynne, in Cross County, just south of the St. Louis, Iron Mountain & Southern Kailway, showed 16 feet of gravel, con sisting chiefly of angular to fairly well rounded pebbles and cobbles of brown and gray flint and chert as much as 6 inches in length, with some well-rounded quartz pebbles, lying in a matrix of coarse red dish sand. This material is covered by about 10 feet of loam. In northeastern Mississippi gravels carrying abundant flint peb bles have been noted in Tishomingo County, a locality about 2% to 3 miles east of Iuka being especially mentioned. Some of these de posits are 50 to T5 feet thick and cover large areas. The flints are only in part well rounded and portions of the deposit are iron stained. The gravel is extensively excavated for use in road making. In Texas light opalescent to black flint pebbles are abundant at several localities. They are well exposed along the river bluffs near Austin, Travis County, where they have weathered out of the lime stone. They also occur along Nueces Biver near Oakville, in Live Oak County, and over large areas near Tilden, in McMullen County. Only here and there are these flints well rounded, and many of them are coated with a thin film of iron oxide. For certain kinds of tube mill grinding—as, for example, the grinding of feldspar or of crystalline quartz for making pottery— pebbles practically free from any iron-bearing mineral must be used, for even small specks of iron-bearing minerals produce stains in pottery on firing. For other purposes, however, as, for example, the grinding of gold ores preparatory to cyanidation, the same free dom from iron is not necessary, and rounded pebbles of various kinds of hard rocks collected from benches, stream beds, or gravel deposits

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