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 7
... loss occasioned by stopping to rest or change the animals . Arrangements for erecting steam engines , and additional bar- rel machinery have been made , and the mining operations will be vigorously prosecuted . SANTA RITA SILVER MINING ...
... loss occasioned by stopping to rest or change the animals . Arrangements for erecting steam engines , and additional bar- rel machinery have been made , and the mining operations will be vigorously prosecuted . SANTA RITA SILVER MINING ...
Page 19
... loss in weight being due , in part , to mechanical loss in stamping and manipu- lating and to calcination . The consumption of wood is one and a quarter to one and a half cords to every ton of ore . To decompose the chloride of copper ...
... loss in weight being due , in part , to mechanical loss in stamping and manipu- lating and to calcination . The consumption of wood is one and a quarter to one and a half cords to every ton of ore . To decompose the chloride of copper ...
Page 38
... loss ) , Water ,. 87.41 35 35.11 21.40 5.73 100.00 The quantity of datholite which is found on Lake Superior is very considerable , but it does not occur as a constant ingre- dient of the veinstone in any of the large mines now worked ...
... loss ) , Water ,. 87.41 35 35.11 21.40 5.73 100.00 The quantity of datholite which is found on Lake Superior is very considerable , but it does not occur as a constant ingre- dient of the veinstone in any of the large mines now worked ...
Page 39
... loss , as giving more accurate results than could be obtained by the process of reduction with hydrogen . It appears , there- fore , that these ores are mixtures of the peroxyd with a mi- nute and varying portion of the magnetic oxyd ...
... loss , as giving more accurate results than could be obtained by the process of reduction with hydrogen . It appears , there- fore , that these ores are mixtures of the peroxyd with a mi- nute and varying portion of the magnetic oxyd ...
Page 40
... loss by ignition agrees well with the formula which takes the oxygen ratio of the bases and silica as 49 , and 12 H. Limonite . This ore of iron has recently been discovered , and for the first time on Lake Superior in any noticeable ...
... loss by ignition agrees well with the formula which takes the oxygen ratio of the bases and silica as 49 , and 12 H. Limonite . This ore of iron has recently been discovered , and for the first time on Lake Superior in any noticeable ...
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acid amount antimony appears Arizona arsenic assay average basin beds Bornite bottom calcination California carbonate Carboniferous cent chemical chloride coal collieries contain copper cost Cretaceous crevice crystals cupel Dahlonega decomposed decomposition deposits depth discovery district east Edward Hitchcock employed explorations extended extraction formation formed fossils furnace galena geological geologists gold gossan heat Hill hundred feet inches iron labor Lake Superior lead limestone locality lode lower mass matts melted 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 rock salt sandstone schists shaft shales silver slag smelting Sonora specimens steel strata sulphate sulphur sulphuret surface Survey temperature Tetradymite thickness 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.