Report of James W. Taylor, on the Mineral Resources of the United States East of the Rocky Mountains [1867]U.S. Government Printing Office, 1868 - 71 Seiten |
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Seite 7
... geologist , reports that there are at least 10 beds from 5 to 13 feet in thickness , belonging to the tertiary period and of the lignite variety . It is non- bituminous and holds a position between dry wood and the anthracites of Penn ...
... geologist , reports that there are at least 10 beds from 5 to 13 feet in thickness , belonging to the tertiary period and of the lignite variety . It is non- bituminous and holds a position between dry wood and the anthracites of Penn ...
Seite 14
... geologist and mineralogist . Its course has been frequently followed by scientific observers , either employed by the Hudson's Bay Company , or com- missioned by the English government for exploration of the Arctic coast . These ...
... geologist and mineralogist . Its course has been frequently followed by scientific observers , either employed by the Hudson's Bay Company , or com- missioned by the English government for exploration of the Arctic coast . These ...
Seite 15
... geological range of rocks , from the granite and metamorphosed azoic to the cretaceous formations of the surrounding plains , are developed by the upheaval of the mountain mass . Thus , at the junction of silurian rocks , gold becomes ...
... geological range of rocks , from the granite and metamorphosed azoic to the cretaceous formations of the surrounding plains , are developed by the upheaval of the mountain mass . Thus , at the junction of silurian rocks , gold becomes ...
Seite 17
... geological commission to embrace 10,000 square miles . The gravels , through which the gold is very irregularly distributed , are generally covered by a layer of vegetable earth and often by a bed of clay . They repose in part upon ...
... geological commission to embrace 10,000 square miles . The gravels , through which the gold is very irregularly distributed , are generally covered by a layer of vegetable earth and often by a bed of clay . They repose in part upon ...
Seite 18
... geological survey , claims that the river banks would richly repay the use of hydraulic methods . Assuming that the cost in Canada of washing gravel by this method would be one - fourth as much as in California , or five cents the cubic ...
... geological survey , claims that the river banks would richly repay the use of hydraulic methods . Assuming that the cost in Canada of washing gravel by this method would be one - fourth as much as in California , or five cents the cubic ...
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Report of James W. Taylor, on the Mineral Resources of the United States ... James Wickes Taylor Keine Leseprobe verfügbar - 2018 |
Häufige Begriffe und Wortgruppen
20 per cent aggregate Alder gulch amount artesian assay auriferous average Bannock basin beds belt boring California centre cents per pound claim coast Cobequid hills Colorado considerable copper cretaceous Deer Lodge Deer Lodge county depth discovered discovery distance Drab clay east eastern estimate exploration extent favorable feet formation Fort Benton galena gallon geological gold and silver gold districts gold mining gold-bearing granite Helena inches iron Lake land Laramie Laramie plains lead ledge lignite localities lode Mexico mills mineral Missouri river Montana nearly Nova Scotia ounces Pacific passed placer deposits placer mining portion pre-emption present profit province quantity quartz quartz veins quartzite railroad railway range region rich rock Rocky mountains sandstone Saskatchawan seams shore silurian smelting square miles strata streams sulphurets Summit surface Tangier Territory thickness tion tributary valley vicinity Victoria Virginia City washings western yield