The Mining Magazine: Devoted to Mines, Mining Operations, Metallurgy, &c., &c, Том 31854 |
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Стр. 3
... depth of 1,800 feet ; but the beds are here so nearly level that , except for the purpose of reaching lower seams ( which is not likely to happen ) , this may be esteemed nearly the utmost depth that will be realized . The heat at this ...
... depth of 1,800 feet ; but the beds are here so nearly level that , except for the purpose of reaching lower seams ( which is not likely to happen ) , this may be esteemed nearly the utmost depth that will be realized . The heat at this ...
Стр. 4
... depth of the coal seams be- low the surface ; are circumstances which give to the western collieries a nearly entire immunity from fire - damp ; choke - damp ( " stythe " ) is perhaps rather more frequent in them than in the collieries ...
... depth of the coal seams be- low the surface ; are circumstances which give to the western collieries a nearly entire immunity from fire - damp ; choke - damp ( " stythe " ) is perhaps rather more frequent in them than in the collieries ...
Стр. 8
... depth in the districts west of Newcastle . The modern working at Mickley is analogous to what is now generally practised . The first stage of the modern work differs from the above chiefly in the proportions of the parts . The pillars ...
... depth in the districts west of Newcastle . The modern working at Mickley is analogous to what is now generally practised . The first stage of the modern work differs from the above chiefly in the proportions of the parts . The pillars ...
Стр. 9
... depth of 1800 feet , the pillars are 24 yards by 18 . We may now inquire what is the effect on the extrication of gas by this , the first process , or working in whole coal . BORDWAYS COURSE HEADWAYS COURSE EXPLORING DRIFTS EXPLANATION ...
... depth of 1800 feet , the pillars are 24 yards by 18 . We may now inquire what is the effect on the extrication of gas by this , the first process , or working in whole coal . BORDWAYS COURSE HEADWAYS COURSE EXPLORING DRIFTS EXPLANATION ...
Стр. 17
... depths . In the adits , some of which attain a depth of 80 feet , I observed as far as I could enter , which was near to the galleries along the vein , that decomposition had still penetrated to that depth , so as to render a pickaxe ...
... depths . In the adits , some of which attain a depth of 80 feet , I observed as far as I could enter , which was near to the galleries along the vein , that decomposition had still penetrated to that depth , so as to render a pickaxe ...
Другие издания - Просмотреть все
The Mining Magazine: Devoted to Mines, Mining Operations, Metallurgy ..., Том 4 Полный просмотр - 1855 |
The Mining Magazine: Devoted to Mines, Mining Operations, Metallurgy ..., Том 8 Полный просмотр - 1857 |
The Mining Magazine: Devoted to Mines, Mining Operations, Metallurgy ..., Том 8 Полный просмотр - 1857 |
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abundant acid adit amount antimony average bars bushels Canal capital carbonate cent coal collieries commenced contains Copiapo copper cost Creek cwts deposits depth district dollars drift east engine extensive feet Freirina furnace geological gold granite greenstone Hill hundred Illyria inches iron iron pyrites labor Lake Superior lands lead limestone lode manufacture mass metal miles mill mineral Mining Company mining operations month mountains nearly nitrate of soda nitric acid obtained opened outcrop oxide pig iron portion pounds present production profit pyrites quantity quartz railroad region rich ridge river road rocks salt sandstone seam shaft shales share silver slate smelting soda sold stamp steam stockholders stoping strata Styria sulphur sulphuret sulphuric acid surface thickness tion Toltec tons Total tract Transylvania Vallenar Valley vein yield zinc
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Стр. 51 - January, make a report which shall be published in some newspaper, published in the town, city, or village, or if there be no newspaper published in said town, city, or village, then in some newspaper published nearest the place where the business of said company is carried on, which shall state the amount of capital, and of the proportion actually paid in, and the amount of its existing debts, which report shall be signed by the president and...