Economic Geology: Or, Geology in Its Relations to the Arts and ManufacturesW. Blackwood and sons, 1874 - 336 páginas |
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Página xi
... DEPOSITS , Preliminary Surveys . Sinking or Shafting . Winning the Stratum - Modes of . Obstacles and Obstructions to be overcome . 3. MINING IN VEINS , 145 Searching or Prospecting the Country . Working or Winning the Vein . General ...
... DEPOSITS , Preliminary Surveys . Sinking or Shafting . Winning the Stratum - Modes of . Obstacles and Obstructions to be overcome . 3. MINING IN VEINS , 145 Searching or Prospecting the Country . Working or Winning the Vein . General ...
Página 20
... deposits from calcareous waters , and appear as porous , incrusting , stalactitic , and stalagmitic masses . Marl is a loose application for all friable compounds of lime and clay . The marls of fresh - water lakes are spoken of as clay ...
... deposits from calcareous waters , and appear as porous , incrusting , stalactitic , and stalagmitic masses . Marl is a loose application for all friable compounds of lime and clay . The marls of fresh - water lakes are spoken of as clay ...
Página 21
... deposits or salinas are often of considerable thickness and extent . Alum ( sulphate of alumina and potash ) , though chiefly extracted for commercial purposes from certain shales and schists , is also found in nature in the saline or ...
... deposits or salinas are often of considerable thickness and extent . Alum ( sulphate of alumina and potash ) , though chiefly extracted for commercial purposes from certain shales and schists , is also found in nature in the saline or ...
Página 23
... deposits . II . CHRONOLOGICAL ARRANGEMENT OF ROCK - FORMATIONS . It is not enough , however , to determine merely the posi tions , structure , texture , and composition of rocks ; the geo- logist must endeavour to ascertain their ...
... deposits . II . CHRONOLOGICAL ARRANGEMENT OF ROCK - FORMATIONS . It is not enough , however , to determine merely the posi tions , structure , texture , and composition of rocks ; the geo- logist must endeavour to ascertain their ...
Página 25
... deposits , there occur over the northern hemisphere ( down to the 40th parallel of latitude or thereby ) thick accumulations of clay and gravel , imbedding huge water - worn blocks or boulders ; and as these seem to point to a time when ...
... deposits , there occur over the northern hemisphere ( down to the 40th parallel of latitude or thereby ) thick accumulations of clay and gravel , imbedding huge water - worn blocks or boulders ; and as these seem to point to a time when ...
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Economic Geology: Or, Geology in Its Relations to the Arts and Manufactures David Page Visualização integral - 1874 |
Economic Geology: Or, Geology in Its Relations to the Arts and Manufactures David Page Visualização integral - 1874 |
Economic Geology: Or, Geology in Its Relations to the Arts and Manufactures David Page Visualização integral - 1874 |
Palavras e frases frequentes
abundance admixture agricultural alumina amount antimony arsenic arts and manufactures basalts beds bismuth bituminous blocks Britain calcareous carbonate carbonic acid Carboniferous cements chalk chemical chiefly chloride clay clayey coal colour compact composition consists containing copper crust crystalline crystals deposits districts durable earth employed engineer felspar fire-clays formations geologist Geology gold granites gravels Greensand greenstones grits gypsum hard heat hence hornblende igneous ingredients iron ironstones known largely lignites lime limestones lustre magnesia manganese manures marbles marls masses material metamorphic mineral and metallic mortar nature obtained occasionally occur Oolite ornamental oxide peat phosphate pigments polish porphyries potash preparation purposes pyrites quarries quartz require rocks saline salts sand sandstones schists serpentines shales silica Silurian silver soda sodium soft soils specific gravity stones strata stratified structure subsoils substances sulphate sulphide sulphuric acid surface tellurium tertiary texture thickness tion tons usually varieties various vary veins volcanic yield zinc