Lead mine

“ When our mining experts discover a mineral belt containing precious metals or copper, iron, lead, nickel, platinum, cobalt, quicksilver, manganese or any other ore used in manufactures and the arts, the first thing we do is to sink a shaft on the most likely ore chimney and at every one hundred feet in depth we run levels to develop it and if we continue to find ore as we go down and the ground requires drainage, we survey for a drainage tunnel that will drain the mine at the greatest depth, even if we have to run a tunnel ten miles. ”

“ Wing-traverses, on the side of the trench which is least exposed, some times serve the same purpose as a double sap.
Mines.—By mining, as a military term, we understand the operations resorted to for the demolition, with powder, of a military structure of any description. The term mine is applied both to the excavation charged with powder for the purpose of producing an explosion, and to the communications which lead to this excavation. ”

“ In other sections, again, where there have been large overflows of porphyry upon the carboniferous [314] or silurian limestone, great deposits of silver lead ore are found, often covering many acres of ground like vast coal-beds. To this latter class belong the mines of Leadville, which in the past ten years have yielded over $100,000,000. Also the mines about Aspen, Robinson, Red Cliff, Monarch, White Pine, and Rico. Wherever the deposits, however, and whatever the character of the mineral, the result is the same—an increase in the wealth of the State where developed. ”

“ Besides coal, Ireland contains mines of copper and lead, found in the slate and limestone ranges, contiguous to the sea coast. Crossing from thence to Spain, we arrive in a country rich in mines, though, owing to its distracted state, for many years greatly neglected. Here lead is found in large quantities in the mountain chains.
Quicksilver is abundant from extensive veins of cinnabar in the province of Mancha. In Galicia tin has been produced from very early times. Iron ore is very abundant, and silver mines, for many centuries abandoned, are now again being reworked. ”

“ Cumberland, the north of Wales, and the Isle of Anglesey produce copper ore, as also mines of lead and magnesia, with many other metals,—zinc, arsenic, cobalt, and bismuth. Iron in large quantities is found in South Wales, South Staffordshire, and in the Scottish coal-fields, where the ironstone appears in abundance alternating with layers of coal and other strata, and is generally won from the same pit as that from which the coal is extracted. ”

“ If one is in the mines without a light, he has before him, behind him, everywhere, utter blackness. To be lost in this way, a mile from any opening to day, in the midst of a confusion of galleries, in an abandoned mine, and to be compelled to feel one’s way to safety, is a painful experience, is one indeed which the writer himself has had.
There comes a time in the history of every mine when it is pervaded only by silence and darkness. All the coal that can be carried from it by the shaft or slope or other outlet has been mined and taken out, and the place is abandoned. ”

“ When we have to use drainage tunnels for our mines we carry the water off from the mouth of the tunnel in a flume, placing quicksilver in the riffles, and if it is a copper mine we place scrap iron in the water and we also use the water for power to assist us in mining, so that at the present time we extract and reduce ore at a lower rate than in other parts of the world, for there is no wastefill management and no overproduction, for in all our mining operations we work those that cost the least, and we operate our coal mines in the same way. ”

“ Several of the mines in the mineral soil have been traced down into the rock, and have been pursued through apertures, closing and expanding in the manner of true veins. In the numerous cases where the rock has put a stop to further mining, and it has exhibited no signs of ore, it may be supposed that the ore has been moved, by diluvial force, from the original position of the mine, and been finally deposited, with the soil, upon unmetalliferous portions of the rock. ”

“ Solitude, the safeguard of mediocrity, is to genius the stern friend, the cold, obscure shelter where moult the wings which will bear it farther than suns and stars. He who should inspire and lead his race must be defended from travelling with the souls of other men,—from living, breathing, reading, and writing in the daily, time-worn yoke of their opinions. ”

“ A similar sacrifice in the shape of pillars is often necessary to support the surface, either to avoid injury to valuable structures or to prevent a flooding of the mine. As already noted large pillars must always be left to protect shafts, adits and the more important mine-passages necessary for drainage, ventilation and the haulage of mineral. In the early history of mining there was but little attempt at systematic development and working, and the mines were often irregular and tortuous. ”

“ Imagine the descent into a mine through the sea, the miners working at the depth of 12 fathoms below the waves; the rod of a steam engine extending from the shore to the shaft, a distance of nearly 120 fathoms; and a great number of men momentarily menaced with an inundation of the sea, which continually drains in no small quantity through the roof of the mine, and roars loud enough to be distinctly heard in it.” Tin is the principal produce of this mine, and the ore is extremely rich. ”

“ Two main roads lead up the valley, one at the base of the hills on either side; and riding along either of them in a pleasant day, an admirer of nature's wild grandeur has ample occasion of admiration. The gentle slope, rising way back and up as if touching the clouds, and the more abrupt and ragged, shrub-covered, not less high hills, miniature mountains, with every now and then a ravine down which the water leaps playfully along till it reaches the plateau below and into the little creek on its way to the ocean—is a landscape of beauty not easily described. ”

“ The want of capitalists in the mine country, and of practical skill in the boring, blasting, sinking shafts and galleries, oppose obstacles to the [Pg 160] successful progress of mining. There is but one regular hearth-furnace for smelting in the whole district; and that is on the modern plan of English furnaces. There are not over four or five regular shafts in about forty mines; there is not an engine, either by horse, steam, or water power, for removing water from the mines, several of which have been abandoned on this account, with rich prospects of ore in view. ”

“ As their open trenches and pits could be worked only in the summers, and by methods that made their operations much slower than those of modern miners, no great advance of their work was possible during the working time of each season; and yet remains of their mining works have been discovered wherever mines have been opened in our day; and, as previously stated, they are known to exist in heavy forests, where the modern mining works have not yet been established. ”

“ Next day, at the iron mine, he stood listening to the deep cough of the big crusher and the loose rattle of machine drills. A little on one side, and as yet unshaken by dynamite, was the knoll on which Wimperley and the rest had been told what they were sitting on, and he smiled at the recollection. Surveying the widening excavation, he reflected that here, after all, was the heart of the entire enterprise. In fifty—in a hundred years—the mine would still be unexhausted. ”

“ Indeed, this system of mining partakes of the nature of quarrying rather than that of mining in the ordinary sense, the ore being scooped from the surface of the ground. One naturally thinks of a mine as being subterranean; but in the great open-pit mines in the Lake Superior region, which are the largest mines in the world, all the mining is done at the surface of the earth. ”

“ The machinery used for crushing the rock is set in motion by these streams. On every side the men, women, and children employed on the works are seen moving about in all directions, like a busy colony of ants. The ore is obtained without much difficulty.
A tunnel has been formed at the bottom of the mine through which the waters flow after they have performed their task, which also carries away the crushed granite, while the heavier metalliferous substances are precipitated into the troughs. ”

“ The development of the greatest iron mines of Lake Superior occurred in the early nineties, and in the same decade came the combination by which the coal and the coke of the country, and the transportation systems that connect them with the iron mines, have been brought under a few concentrated managements. Side by side with this concentration of capital has gone the combination of labor in the same vast industries. ”

“ Upon the Rand, South Africa, a territory dominated by Englishmen, every mine is equipped with its own mill, and all notions of mining cover the inseparable idea of local ore treatment. Here, in our country, there are many, many mines which have absolutely no means of treating their own products and the managers give no thought whatever to metallurgical or milling lines. There are, on the other hand, many companies that have erected private plants at their mines for the extraction of metallic contents from the ores. ”

“ When a mine is first begun, it is always left open to the sky, and the mineral is extracted by following the vein that contains it; but, as the mine gets deeper, two obstacles present themselves: the extraction of the ore becomes more costly, and the workmen are not long in meeting with hidden springs, the waters of which, unless removed, would drown the mine and stop the works. To provide against this danger, shafts are sunk, at the bottom of which a working gallery runs, that follows the vein of metal. ”

“ That this mine was operated in direct opposition to the local organization of union labor, and had won considerable notoriety by successfully mining coal in spite of the most active hostility, gave an added interest to the work. The physical conditions of the mine were the most perfect that modern engineering has devised: the 'workings' were entirely electrified; the latest inventions in coal-mining machinery were everywhere employed, and every precaution for the safety of the men was followed beyond the letter of the law. ”

“ In the vicinity of the main shaft of the mine, indeed, the incessant action of the huge chain of pumps, produces a constant but not very loud noise, while the occasional rattling of the metallic buckets for raising the ore, against the walls of the shaft, as they ascend and descend, relieves, in some degree, the monotony of the scene. Still every thing is dreary, dull, and cheerless; and one can be with difficulty persuaded, even when in the richest and most populous mines, that he is in the centre of such extensive and important operations. ”

“ The mines are sunk to the depth of one hundred and thirty fathoms, and are extended under the sea to places where there is, above them, sufficient depth of water for ships of large burden. These are the deepest coal mines which have hitherto been wrought; and perhaps the miners have not, in any other part of the globe, penetrated to so great a depth beneath the surface of the sea, the very deep mines in Hungary, Peru and elsewhere, being situated in mountainous countries, where the surface of the earth is elevated to a great hight above the level of the ocean. ”

“ Secondly, water from clay pipes is much more wholesome than that which is conducted through lead pipes, because lead is found to be harmful for the reason that white lead is derived from it, and this is said to be hurtful to the human system. ”

“ Access to the buried deposits is gained by vertical shafts. Actual mining is now done to a large extent by continuous miners, machines which bore or rip the potash ore from the face and load it into shuttle cars in one continuous operation. The shuttle cars then transport the ore to conveyor belts which move it to the shafts for hoisting. Working conditions and safety are excellent and have led to high productivity from these mines. ”

“ When the men get out of the skip down in the mine, there are many different roads in it, and each man has to go to his own part to work. When he reaches his place he has to drill holes in the rock for the dynamite which breaks up the rock, and the loose stones are taken away along the roads to the lift and then up to the top. There it is stamped with great hammers into dust, and washed, until the gold-dust is separated from the rest. There are thousands of men, both underground and at the top, always at work at the mines. ”

“ There aren't any door-boys in a modern mine. Most of the States in this country have passed laws requiring that all doors through which coal cars pass must be operated automatically. The United States Bureau of Mines keeps a sharp lookout, too. There aren't any donkeys, either, not in up-to-date mines; endless-chain conveyors take the coal from the face where the miner has dug it clear to the mouth of the shaft, and load it into the buckets by a self-tipping device. As for small boys in a mine, as you said yourself, there aren't any, not in the United States, anyhow. ”

“ Copious springs are found where there are mines of gold, silver, iron, copper, lead, and the like, but they are very harmful. ”