Bulletin, 325-329. sayılarU.S. Government Printing Office, 1949 |
Kitabın içinden
100 sonuçtan 1-5 arası sonuçlar
Sayfa v
... mining and development Production Methods of mining . System of working coal . Mining Haulage , ventilation , and drainage Minimum limit of thickness . Preparation of the coal for market ... . Labor Portion of contract between miners ...
... mining and development Production Methods of mining . System of working coal . Mining Haulage , ventilation , and drainage Minimum limit of thickness . Preparation of the coal for market ... . Labor Portion of contract between miners ...
Sayfa 7
... mining districts are as follows : The Little Rock and Fort Smith branch of the Iron Mountain Railway extends through the whole length of the field , north of the river , with spurs and branch roads to the mines near Denning , Coal Hill ...
... mining districts are as follows : The Little Rock and Fort Smith branch of the Iron Mountain Railway extends through the whole length of the field , north of the river , with spurs and branch roads to the mines near Denning , Coal Hill ...
Sayfa 53
... mines , and near Jenny Lind there are two active mines oper- ated by the Western Coal and Mining Company . East of Jenny Lind several strip pits and banks have been mined for local use , the Bostick bank , in sec . 13 , T. 8 N. , R. 31 ...
... mines , and near Jenny Lind there are two active mines oper- ated by the Western Coal and Mining Company . East of Jenny Lind several strip pits and banks have been mined for local use , the Bostick bank , in sec . 13 , T. 8 N. , R. 31 ...
Sayfa 54
... mines the only parting actually rejected in mining is the one that appears in the center of the bed in all the sections measured . This parting varies from less than an inch to over 6 inches in thickness . Although usually shaly , it is ...
... mines the only parting actually rejected in mining is the one that appears in the center of the bed in all the sections measured . This parting varies from less than an inch to over 6 inches in thickness . Although usually shaly , it is ...
Sayfa 66
... mining purposes found the parting over 4 feet in thickness and was abandoned for mining purposes , though it is still used as a pump shaft to drain one a Ann . Rept . Geol . Survey Arkansas , 1888 , vol . 3 , p . 21 . T8N . of the mines ...
... mining purposes found the parting over 4 feet in thickness and was abandoned for mining purposes , though it is still used as a pump shaft to drain one a Ann . Rept . Geol . Survey Arkansas , 1888 , vol . 3 , p . 21 . T8N . of the mines ...
Diğer baskılar - Tümünü görüntüle
Sık kullanılan terimler ve kelime öbekleri
Alaska Arkansas auriferous average basin beach beam bed rock bench Bendeleben Mountains boiler efficiency bowlders Cape Nome carbon cent Chickaloon chloritic clay clinker coal bed coal field coastal plain Collier combustion-chamber temperature creek bed curve deposits district ditch Drill hole dry coal east efficiency 72 fault feet thick formation Fort Smith fossils furnace Geological Survey geology granite gravel greenstone Gulch Hartshorne hydrogen inches Kigluaik Kigluaik Mountains Kougarok limestone lower Matanuska Matanuska River material miles mineral mining Mountains mouth Neuropteris Niukluk River Nome group Norton Bay Norton Bay regions Number of tests Ophir Creek outcrop pay streak placer gold Port Clarence pound of combustible pounds of dry probably quartz ratio reconnaissance reported River sample sand sandstone schist Seward Peninsula shaft Shale Shale roof shows slope Spadra stream surface tion tributary U. S. Geol upper valley veins
Popüler pasajlar
Sayfa 19 - These pats, to satisfactorily pass the requirements, shall remain firm and hard and show no signs of distortion, checking, cracking, or disintegrating.
Sayfa 172 - Avogadro's law states that equal volumes of all gases at the same temperature and pressure contain the same number of molecules...
Sayfa 20 - All tests shall be made in accordance with the methods proposed by the Committee on Uniform Tests of Cement...
Sayfa vi - The interaction between minerals and water solutions, with special reference to geologic phenomena, by EC Sullivan.
Sayfa 10 - Reconnaissances in the Cape Nome and Norton Bay regions, Alaska, in 1900,
Sayfa 81 - Method. — As a method to be followed for the analysis of cement, that proposed by the committee on uniformity in the analysis of materials for the...
Sayfa 19 - Sand. 7 days (1 day in moist air, 6 days in water)... 200 Ibs.
Sayfa viii - Butts. 1906. 198 pp., 11 pis. B 280. The Rampart gold placer region, Alaska, by LM Prindle and FL Hess. 1906.
Sayfa 19 - Pats of neat cement about 3 inches in diameter, \ inch thick at the center, and tapering to a thin edge, shall be kept in moist air for a period of 24 hours. " (a) A pat is then kept in air at normal temperature and observed at intervals for at least 28 days.
Sayfa 7 - Concrete and Reinforced Concrete was formed by the union of Special Committees appointed in 1903 and 1904 by the American Society of Civil Engineers, the American Society for Testing Materials, the American Railway Engineering...