Bulletin, 325-329. sayılarU.S. Government Printing Office, 1949 |
Kitabın içinden
100 sonuçtan 1-5 arası sonuçlar
Sayfa 45
... reported , as follows : Determination of average diameter of coal samples . Diameter of holes ( inches ) . Pounds of coal through each set of holes . Weight of coal . Reduced to determining Actual . 100 - pound average size . basis . 1 ...
... reported , as follows : Determination of average diameter of coal samples . Diameter of holes ( inches ) . Pounds of coal through each set of holes . Weight of coal . Reduced to determining Actual . 100 - pound average size . basis . 1 ...
Sayfa 44
... reported to have caused great consternation at first , the coal was soon located again . on the other side , and there was very little loss . It has not been encountered elsewhere in the mines , for the reason that none of them have ...
... reported to have caused great consternation at first , the coal was soon located again . on the other side , and there was very little loss . It has not been encountered elsewhere in the mines , for the reason that none of them have ...
Sayfa 45
... reported that the coal bed is divided by a thick shale parting near the fault , so that the workings are usually abandoned before the actual break is reached . In a few of the mines , however , the fault has been actually observed ...
... reported that the coal bed is divided by a thick shale parting near the fault , so that the workings are usually abandoned before the actual break is reached . In a few of the mines , however , the fault has been actually observed ...
Sayfa 53
... reported to be too thin for mining and to be divided by partings . In general the bed consists of two benches of coal , with a shale parting near the center . Some of its local variations are shown by the sections presented in fig . 16 ...
... reported to be too thin for mining and to be divided by partings . In general the bed consists of two benches of coal , with a shale parting near the center . Some of its local variations are shown by the sections presented in fig . 16 ...
Sayfa 55
... approximately 2 feet thick , which is probably identical with this one , has been reported at a depth of 500 feet in a well drilled for gas and oil . GREENWOOD AND HUNTINGTON DISTRICT . Location and extent . The HARTSHORNE COALS . 55.
... approximately 2 feet thick , which is probably identical with this one , has been reported at a depth of 500 feet in a well drilled for gas and oil . GREENWOOD AND HUNTINGTON DISTRICT . Location and extent . The HARTSHORNE COALS . 55.
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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
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