The pillar and stall is generally practised in preference to the long wall system of " getting" the coal. None of the mines are of great depth, and a perfect freedom from fire and choke damp render it possible to carry on the work without its being necessary... The Imperial Gazetteer of India - Seite 503von William Wilson Hunter - 1886 - 430 SeitenVollansicht - Über dieses Buch
| Valentine Ball - 1880 - 786 Seiten
...getting " the coal None of the mines are of great depth, and a perfect freedom from fire and choke damp renders it possible to carry on the work without its...best coal. Compared with ordinary English coal, the Ranigunj coals, and Indian coals generally, are very much inferior in working power, still they are... | |
| Royal Geological Society of Ireland - 1880 - 324 Seiten
...the coal. None of the mines are of great depth, and a perfect freedom from fire and choke-damp render it possible to carry on the work without its being...considerable thickness, one which is worked contains nearly forty feet of coal. As a rule, however, the thick seams, especially those in the lower measures, do... | |
| William Wilson Hunter - 1881 - 554 Seiten
...Calcutta, tends to give it pre-eminence over other less favourably situated localities. In the year 1 774, coal was known to occur there, and so long ago as...best coal. Compared with ordinary English coal, the Ram'ganj coals, and Indian coals generally, are very much inferior in working power ; still they are... | |
| Valentine Ball - 1881 - 152 Seiten
...the coal. None of the mines are of great depth, and a perfect freedom from fire and choke damp render it possible to carry on the work without its being...best coal. Compared with ordinary English coal, the Ranigunj coals, and Indian coals generally, are very much inferior in working power. Still they are... | |
| Valentine Ball - 1881 - 152 Seiten
...the coal. None of the mines are of great depth, and a perfect freedom from fire and choke damp render it possible to carry on the work without its being...especially those in the lower measures, do not contain the-best coal. Compared with ordinary English coal, the Ranigunj coals, and Indian coals generally,... | |
| Royal Dublin Society - 1880 - 804 Seiten
...the coal. None of the mines are of great depth, and a perfect freedom from fire and choke damp render it possible to carry on the work without its being...considerable thickness, one which is worked contains nearly forty feet of coal. As a rule, however, the thick seams, especially those in the lower measures, do... | |
| Royal Dublin Society - 1880 - 712 Seiten
...the coal. None of the mines are of great depth, and a perfect freedom from fire and choke damp render it possible to carry on the work without its being...considerable thickness, one which is worked contains nearly forty feet of coal. As a rule, however, the thick seams, especially those in the lower measures, do... | |
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