Scenery, Science and Art: Being Extracts from the Note-book of a Geologist and Mining EngineerJ. Van Voorst, 1854 - 323 páginas |
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Página 16
... obtain an estimate , however general , of the total quantity of available coal in these conces- sions , and I therefore made the necessary calculations for the purpose . Owing to the great irregularity in thickness of the dif- ferent ...
... obtain an estimate , however general , of the total quantity of available coal in these conces- sions , and I therefore made the necessary calculations for the purpose . Owing to the great irregularity in thickness of the dif- ferent ...
Página 17
... obtained by deeper adits entering in some places from the valley of the Aveyron , although no extensive mining opera- tions could be carried on without arrangements being made for deep sinkings , in which it is not unlikely that there ...
... obtained by deeper adits entering in some places from the valley of the Aveyron , although no extensive mining opera- tions could be carried on without arrangements being made for deep sinkings , in which it is not unlikely that there ...
Página 20
... obtained , the former being the principal mineral . The southernmost extremity of this great plateau is situated in the department of Aveyron , and is partly covered by the coal - measures , new red sandstone and jurassic limestones ...
... obtained , the former being the principal mineral . The southernmost extremity of this great plateau is situated in the department of Aveyron , and is partly covered by the coal - measures , new red sandstone and jurassic limestones ...
Página 21
... 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 machine , and I lately obtained from about ninety ...
... 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 machine , and I lately obtained from about ninety ...
Página 22
... obtained from the district was enough to justify the establishment of a mint in the town of Villefranche , but the introduction of the precious metals in large quantities after the discovery of America appears to have checked and ...
... obtained from the district was enough to justify the establishment of a mint in the town of Villefranche , but the introduction of the precious metals in large quantities after the discovery of America appears to have checked and ...
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.