Transactions of the Royal Geological Society of Cornwall, Band 8,Teil 1The Society, 1871 Vol. 6, includes the society's annual reports for 1844-46. |
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4me Série adjoining afforded Annales des Mines Asiatic Researches Asiatic Society auriferous beds Brazil Brazilian Mining Association calcareous CAPTAIN HERBERT Captain Treloar Chañarcillo chlorite clay-slate Colorada lode columns COMMISSIONER BATTEN Copiapò copper Cornwall Geol cross-veins d'el Rey Company depth district earthy brown iron-ore Eschwege Extracts fathoms feet felspar Flucan formation Geological Transactions gneiss gold Gongo Gongo Soco gossan Government Calcutta granite Henwood hornblendic Huel hydrous oxide Ibid Imperial Brazilian Mining inches ingredients iron iron-glance Jacotinga John d'el Rey joints Journal laminæ limestone lode manganese Martius masses metalliferous deposit micaceous Minas Geraes miners mixed Morro Velho native silver Official Reports oxydulated Pluto Pluto Brasiliensis portions pyrites quantities quartz quartzose Records of Government Reise in Brasilien Reports on Kumaon rock Saint John d'el schist schistose shaft siliceous silver-ore slate Spix strata surface Table VIII talc talcose thick Trans Troy veins weight whilst wrought yielded
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Seite 686 - Reprinted with revisions and corrections up to 1851. ENGLAND (Continued) 484. WEBB, — , and GEACH, — . History and progress -of mining in the Caradon and Liskeard district. Not available to the author*. WEEKS, JOSEPH D. See No. 1372. 485. WEST, HE Cornish tin mining.
Seite 372 - They are thirty-four in number, built of logs from six to ten inches in diameter, and from ten to twelve feet in length. The walls are from three to six feet in height, forming a continuous line or street of three hundred feet.
Seite 621 - ... sandstones they run in all directions, sometimes with, but more generally across, the strike. In the Silurian region they more generally run more or less parallel with the lines of bedding.
Seite 465 - As we descended farther from the surface, large masses of ice appeared, covering the sides of the precipices. Ice is raised in the buckets with the ore and rubble of the mine : it has also accumulated in such quantity in some of the lower chambers, that there are places where it is fifteen fathoms thick, and no change of temperature above prevents its increase.
Seite 377 - For the most part, it has a slaty cleavage, and on close inspection, is observed to be composed of alternating bands of micaceous specular iron and quartz, tinged red by the peroxide of iron; but there are occasional belts of granular texture, and apparently of greater purity.
Seite 470 - ... of its geographical geology, and that in fact he had made these references, only to render more intelligible what he wished to say upon the subject of the metalliferous veins of the district. It is a fact well known, that south from the district referred to, transported masses of native copper are occasionally met with, in the diluvial deposits which are so abundantly spread over the country; and these loose masses are distributed over an area of many thousand miles, including southern Michigan,...
Seite 472 - Lake ; but, as might have been expected under the circumstances, they proved entirely abortive." •WHITNEY, Metallic Wealth of the United Statei, p. 247, " On the side of a rivulet, ten leagues to the south of Lake Superior in North America, there is a single lump of native copper, about four tons weight, free from any mixture but a few small black Stones of an Iron nature, and some very fine grains of Crystal. * * * No vein of copper was discovered on the south side of the Lake, near this lump...
Seite 141 - To prevent their shoulders from being hurt, (for the miners are generally naked to the middle) they place a woollen covering (frisada) under this bag. We meet in the mines with files of fifty or sixty of these porters, among whom there are men above sixty, and boys of ten or twelve years of age.
Seite 463 - Fort Brady during the whole season corresponds in a remarkable degree with that of St. Petersburg. The temperature of the region is very favorable to the growth of cereals. The annual ratio of fair days at Fort Brady is 168 ; of cloudy days, 77 ; rainy days, 71 ; snowy days, 47.
Seite 421 - The remarkable and uniform richness of the vein may be inferred from the fact that no part of it is so poor as not to be worth taking down ; and so far as the work has been carried, hardly a fathom of ground has been left standing on it.