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 4
... feet . The two groups are about 150 fathoms apart , and the pits hitherto sunk have been almost all on the beds to the south . The asso- ciated rocks are chiefly gritstones , more or less coarsely grained , and often stained with iron ...
... feet . The two groups are about 150 fathoms apart , and the pits hitherto sunk have been almost all on the beds to the south . The asso- ciated rocks are chiefly gritstones , more or less coarsely grained , and often stained with iron ...
Página 4
... feet . The two groups are about 150 fathoms apart , and the pits hitherto sunk have been almost all on the beds to the south . The asso- ciated rocks are chiefly gritstones , more or less coarsely grained , and often stained with iron ...
... feet . The two groups are about 150 fathoms apart , and the pits hitherto sunk have been almost all on the beds to the south . The asso- ciated rocks are chiefly gritstones , more or less coarsely grained , and often stained with iron ...
Página 14
... feet thick are not even named . It must , however , be borne in mind that the thickness is not the same over any length of section , although the seams themselves appear constant * . * The following are the names and average thicknesses ...
... feet thick are not even named . It must , however , be borne in mind that the thickness is not the same over any length of section , although the seams themselves appear constant * . * The following are the names and average thicknesses ...
Página 16
... feet each , but cannot , I think , be calculated on as having in all a greater mean total thickness than twelve feet . The middle part of the crop appears to have the thickest beds , but these do not extend many hundred yards without ...
... feet each , but cannot , I think , be calculated on as having in all a greater mean total thickness than twelve feet . The middle part of the crop appears to have the thickest beds , but these do not extend many hundred yards without ...
Página 19
... feet of a dark purple ore of good quality , consisting of a mixed oxide and carbonate of iron with carbonate of lime , the yield averaging about twenty to twenty - two and a half per cent . Occasional bands of pyrites occur , but may ...
... feet of a dark purple ore of good quality , consisting of a mixed oxide and carbonate of iron with carbonate of lime , the yield averaging about twenty to twenty - two and a half per cent . Occasional bands of pyrites occur , but may ...
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.