The Mining Magazine and Journal of Geology, Mineralogy, Metallurgy, Chemistry and the Arts, Their Applications to Mining and Working Useful Ores and Metals, Volume 11860 |
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Page 9
... present exists . The capitalists of Mexico will not in- vest their means in developing the resources of Sonora , and in consequence , the finest country in the world is fast receding to a state of nature . " He gives " the following ...
... present exists . The capitalists of Mexico will not in- vest their means in developing the resources of Sonora , and in consequence , the finest country in the world is fast receding to a state of nature . " He gives " the following ...
Page 31
... present . In conclusion , let me say that by the agency of water , highly heated under great pressure , nearly every fact of meta- morphism of sedimentary rocks may be explained . A humid mass of materials thus permeated by heat , would ...
... present . In conclusion , let me say that by the agency of water , highly heated under great pressure , nearly every fact of meta- morphism of sedimentary rocks may be explained . A humid mass of materials thus permeated by heat , would ...
Page 32
... present communication , I have put together in the alphabetical order of the minerals noticed , for convenient reference . A few of the facts here stated were communicated to J. D. Dana , for the last edition of his " System of ...
... present communication , I have put together in the alphabetical order of the minerals noticed , for convenient reference . A few of the facts here stated were communicated to J. D. Dana , for the last edition of his " System of ...
Page 33
... present , sus- pended . Both these mines are , in fact , on the same vein , the Copper Falls mine being to the noh , and the North - western to the south of the great belt of crystalline , unproductive trap , which runs through the ...
... present , sus- pended . Both these mines are , in fact , on the same vein , the Copper Falls mine being to the noh , and the North - western to the south of the great belt of crystalline , unproductive trap , which runs through the ...
Page 39
... present , amounting , in each case , to 0.05 per cent . It was not possible , in any instance , to obtain a weighable amount of alumina . The oxygen was therefore determined by the loss , as giving more accurate results than could be ...
... present , amounting , in each case , to 0.05 per cent . It was not possible , in any instance , to obtain a weighable amount of alumina . The oxygen was therefore determined by the loss , as giving more accurate results than could be ...
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Common terms and phrases
acid amount analcime anthracite antimony appears Arizona arsenic assay average barrel beds bottom calcination California carbonate Carboniferous cent chemical chloride coal collieries contain copper cost Cretaceous crevice crystals cupel Dahlonega decomposed decomposition deposits depth discovery district ditch Edward Hitchcock employed explorations extended extraction formation formed fossils furnace galena geological geologists gold heat Heintzelman Hill inches iron labor Lake Superior lead limestone locality lode lower mass matts melting metal metamorphic miles mineral Mining Company mountains nearly observed obtained occur opening operation orthoclase ounces oxyd portion precipitation present produced proportion pyrites quantity quartz region Report reverberatory furnace rich river roasting rocks salt sandstone Santa schists shaft shales slag smelting Sonora specimens steel strata sulphate sulphur sulphuret surface Survey temperature Tetradymite thick tion tons tubs upper Valley vein vicinity Virginiatown washed yield zeolites zinc
Popular passages
Page 154 - On this difficult and mysterious subject a work will very shortly appear, by Mr. Charles Darwin, the result of twenty years of observation and experiments in Zoology, Botany, and Geology, by which he has been led to the conclusion, that those powers of nature which give rise to races and permanent varieties in animals and plants, are the same as those which, in much longer periods, produce species, and, in a still longer series...
Page 154 - Geology, by which he has been led to the conclusion, that those powers of nature which give rise to races and permanent varieties in animals and plants, are the same as those which, in much longer periods, produce species, and, in a still longer series of ages, give rise to differences of generic rank. He appears to me to have succeeded, by his investigations and reasonings...
Page 152 - I have thus failed to obtain satisfactory evidence in favor of the remote origin assigned to the human fossils of Le Puy, I am fully prepared to corroborate the conclusions which have been recently laid before the Royal Society by Mr. Prestwich, in regard to the age of the flint implements associated in undisturbed gravel, in the North of France, with the bones of elephants at Abbeville and Amiens. These were first noticed at Abbeville, and their true geological position assigned to them by M. Boucher...
Page 373 - ... of iron and manganese, were brought in contact with the fluid metal, during the process, and the quantity of phosphorus was thereby reduced. Thus many months were consumed in laborious and expensive experiments ; consecutive steps in advance were made, and many valuable facts were elicited.
Page 153 - Somme, in an area fifteen miles in length. I infer that a tribe of savages, to whom the use of iron was unknown, made a long sojourn in this region ; and I am reminded of a large Indian mound, which I saw in St.
Page 97 - Gash veins may cross the strata at any angle ; but are limited to one particular group of strata, and are peculiar to the unaltered sedimentary rocks. True veins are aggregations of mineral matter, accompanied by metalliferous ores, within a crevice or fissure which had its origin in some deepseated cause, and which may be presumed to extend for an indefinite distance downwards.
Page 85 - Post 8vo. 8s. 6d. (FC) Principles of Athenian Architecture, and the Optical Refinements exhibited in the Construction of the Ancient Buildings at Athens, from a Survey. With 40 Plates. Folio. 61. 5s. PERCY'S (JOHN, MD) Metallurgy; or, the Art of Extracting Metals from their Ores and adapting them to various purposes of Manufacture.
Page 151 - Faleoner, of the Brixham Cave, must, I think, have prepared you to admit that scepticism in regard to the cave-evidence in favour of the antiquity of man had previously been pushed to an extreme.
Page 153 - ... feet above the present level of the Somme, for the deposition of fine sediment, including entire shells, both terrestrial and aquatic, and also for the denudation which the entire mass of stratified drift has undergone : portions having been swept away, so that what remains of it often terminates...
Page 153 - ... besides being covered by a newer unstratified drift. To explain these changes, I should infer considerable oscillations in the level of the land in that part of France ; slow movements of upheaval and subsidence, deranging, but not wholly displacing, the course of the ancient river.