Scenery, Science and Art: Being Extracts from the Note-book of a Geologist and Mining EngineerJ. Van Voorst, 1854 - 323 páginas |
No interior do livro
Resultados 1-5 de 57
Página 7
... surface , any valuable indications worth following . There is , however , no doubt a good deal of mineral fuel , and of a quality quite worth having , particularly when we consider the price of English coal ( the only kind available ) ...
... surface , any valuable indications worth following . There is , however , no doubt a good deal of mineral fuel , and of a quality quite worth having , particularly when we consider the price of English coal ( the only kind available ) ...
Página 13
... surface , are about twelve miles in extreme length , with a breadth varying from one to five miles . The Aubin concession alone includes 1800 acres or thereabouts , and that of Decazeville is not less extensive . There are eight or ten ...
... surface , are about twelve miles in extreme length , with a breadth varying from one to five miles . The Aubin concession alone includes 1800 acres or thereabouts , and that of Decazeville is not less extensive . There are eight or ten ...
Página 14
... surface ( see 1 , fig . 2 ) and above the level of the valley , it is found possible to pare away the surface and remove the coal by a process analogous to quarrying . The actual quantity of available coal in this seam in the Aubin ...
... surface ( see 1 , fig . 2 ) and above the level of the valley , it is found possible to pare away the surface and remove the coal by a process analogous to quarrying . The actual quantity of available coal in this seam in the Aubin ...
Página 18
... surface . The cost of getting is less than fifteen - pence per ton . The ore is partly pisolitic , and the beds are traceable on the surface for five or six miles . much more horizontal and of better quality there than in the mines of ...
... surface . The cost of getting is less than fifteen - pence per ton . The ore is partly pisolitic , and the beds are traceable on the surface for five or six miles . much more horizontal and of better quality there than in the mines of ...
Página 21
... surface . This latter metal appears to have been obtained formerly in large quantities . The condition of the minerals obtained from some of the mines of this group suggested to me the desirability of testing it for gold by Berdan's ...
... surface . This latter metal appears to have been obtained formerly in large quantities . The condition of the minerals obtained from some of the mines of this group suggested to me the desirability of testing it for gold by Berdan's ...
Outras edições - Ver tudo
Scenery, Science and Art: Being Extracts from the Note-book of a Geologist ... David Thomas Ansted Visualização integral - 1854 |
Scenery, Science and Art: Being Extracts from the Note-book of a Geologist ... David Thomas Ansted Visualização integral - 1854 |
Scenery, Science and Art: Being Extracts from the Note-book of a Geologist ... David Thomas Ansted Visualização integral - 1854 |
Palavras e frases frequentes
abundant Algiers Alpujarras Amposta appears Aubin Aveyron bands basalt beauty beds Berja Cagliari chain character Cheliff Cherchel chiefly Chiffa coal coal-field coast coloured commenced considerable consists constructed copper crossing cultivated Délémont deposits distance district east Ebro elevation entering exist extending extremely feet France French gorge gossan granite ground hills houses inhabitants interesting interior island Kanawha kind labour land less limestone lode lofty Madrid Mediterranean miles mineral mines Moorish mountains Mouzäia natural nearly numerous obtained occasionally occupied Ohio oolite passing peculiar picturesque Pittsburg plains Porrentruy present principal Pyrenees pyrites quantity quartz range reached remarkable rich ridge rising river road rocks Rodez Roman Sahel sandstone Sardinia scenery schists seams seen shales side Sierra Nevada soon Spain Spanish stream surface Tarragona Tenez tertiary thickness tion town tract traveller valley various vegetation veins village walls whole
Passagens conhecidas
Página 292 - The ore in both cases is an auriferous pyrites, occurring in a whitish or white schist. The vein is worked at a depth of 90 feet or thereabouts, but has been proved to 160, and remains uniform. It yields about 6 dwts.