Limestone quarry

“ Its strength consists of three hundred men, together with about the same number of infantry at Camp Smith, at Rock or Dupere Rapid, a few miles above, who are engaged in quarrying stone for a permanent fortification at that point. On visiting this quarry, I found it to consist of a bluish-gray limestone, semi-crystalline in its structure, containing small disseminated masses of sulphuret of zinc, calcspar, and iron pyrites, and corresponding, in every respect, with the beds of this rock observed along the upper parts of the Fox and Wisconsin valleys. ”

“ The quarry to the north-west of the Isle of Portland, which is the most extensive, is composed almost entirely of the oviform limestone, containing but very few shells; the texture of the work is granular, the nodules very small, and united by a calcareous cement. It crumbles to pieces much more readily than the coarse shelly limestone which lies on the opposite coast of the island. The specific gravity of one specimen I found 2,464 ”

“ Thus in a quarry, we see commonly enough first a bed of limestone, then above that a bed of gravel, and higher still a bed of clay: and even the limestone itself is not usually a compact mass, but is arranged in successive layers, something like the successive courses of masonry in a building. Now it appears that a very large proportion of the Earth’s Crust is made up in this way of successive layers, or strata, as they are called by Geologists. These strata are composed of various substances, such as clay, chalk, sand, lime, and coal; and they present everywhere the same general appearances. ”

“ It is probable that these are the representatives of the Barr limestone, which is very likely of partial occurrence, as an actual limestone, though thin calcareous courses may be found generally on its horizon. At the upper end of the field, under the hedge, was the small quarry. There was but a very small exposure of rock, not enough to show the dip of the beds, which, however, may be presumed to be the same as that of the other Silurian rocks of the neighbourhood, or about 5° to the west. ”

“ To the westward of Pearly Quarry the argillaceous rock is found in conformable stratification with the limestone. It has somewhat of a slaty structure, and includes balls of argillaceous limestone. A road that is cut through this rock exhibits a section of it at right angles to the beating of the strata: it is of very considerable thickness, as the section is about a quarter of a mile in extent, and the same rock continues the whole way. ”

“ Or were the quarrymen driven from the desert, and the Pharaoh from his throne, by the hungry hordes of Ethiopia, or Syria, or the islands beyond the sea? The great stone may be older than Rameses the Great, or as modern as the last of the Romans; but to give it a date, or to divine its history, is impossible. Egypt{172}ology, which has solved the enigma of the sphinx, is powerless here. The obelisk of the quarry holds its secret safe, and holds it forever.
Ancient Egyptian quarrying is seen under its most striking aspect among extensive limestone or sandstone ranges, as at Turra and Silsilis ”

“ No difficulty need be experienced in producing all the varieties of this mineral, as much has been removed and may be found in the vicinity of the quarry, as it is always carefully separated from the limestone as being useless, and thrown aside, or in some instances, when of peculiar beauty, sold as specimens. ”

“ Of other non-metallic mineral substances, apart from coal, petroleum and natural gas, little need be said in detail. Stone is of the greatest actual importance, the value of the quarry output, including some prepared or manufactured product, such as dressed and crushed stone, averaging $65,152,312 annually in 1904-1908. Limestone is by far the largest element, and with granite makes up two-thirds of the total value. Vermont, Pennsylvania and New York are the leading producers. ”

“ There is a mountain of iron ore of superior quality which must furnish material to any desired extent for all future time. An inexhaustible supply of limestone is likewise near at hand to furnish the requisite flux, besides affording lime of an excellent quality. Sandstone is likewise found in abundance near the works, and is now being used to face the furnaces that are being refitted. In addition to these articles a quarry of slate or flagstone is located in close proximity. ”

“ In the limestone was found the flint or chert used for weapons and instruments in early times. For alabaster the principal quarry was that of Hanub in the desert 10 m. behind El Amarna, but it was obtained elsewhere in the limestone region, including a spot near Alexandria. A hard and fine-grained quartzite sandstone was quarried at Jebel Ahmar behind Heliopolis, and basalt was found thence along the eastern edge of the Delta to near the Wadi Tumilāt. ”

“ It is surrounded on all sides by immense heaps of débris, which has been repeatedly dug into during the last thirty years by geologising students, in search of fossils connected with the carboniferous system, and who must have frequently met with the substance which has caused all this excitement, but never imagined it to be gold. The face of the quarry, to the depth of twenty feet from the top, is an accumulation of shale or slate, lying in regular layers, and easily broken. ”

“ The quarry itself is merely a piece of moor that has been trenched to the depth of some five or six feet from the surface, and that presents, at the line where the broken ground leans against the ground still unbroken, a low uneven frontage, somewhat resembling that of a ruinous stone-fence. It has been opened in the outcrop of an ichthyolite bed of the Lower Old Red Sandstone, on which in this locality the thin moory soil immediately rests, without the intervention of the common boulder clay of the country ”

“ For their jewels will be unfolding presently, to soften the cleft granite with misty green and bring the vernal time to these silent cliffs.
The quarry lies like a gash in the slope of the hills. To the dizzy edges of it creep heather and the bracken; beneath, upon its precipices, a stout rowan or two rises, and everywhere Nature has fought and laboured to hide this wound driven so deep into her mountain-side by man. A cicatrix of moss and fern and many grasses conceal the scars of pick and gunpowder; time has weathered the harsh edges of the riven stone ”

“ Fine white freestone abounds in the immediate vicinity (as at Craigleith, from the vast quarry of which, now passing into disuse, the stone for much of the New Town was obtained) and furnishes excellent building material; while the hard trap rock, with which the stratified sandstones of the Coal formation have been extensively broken up and overlaid, supplies good materials for paving and road-making. On this account quarrying is another industry which is seldom dormant. ”

“ It is most probable that the materials would be rough unhewn surface stones, for powder to blast out more solid material would be expensive. Tools for quarrying would be unattainable, and men with skill or industry to work them even still more so, while ant-hill clay would be the only available cement, unless the erection should be in a limestone district, or near a beach, where shells in abundance could be procured and burnt into lime. ”

“ The ancients, instead of opening out a good face, so that the quarries might be worked to any extent with advantage, excavated caverns in the side of the hill, and having arrived at the good sound rock, cut it out by wedges and picks in such masses as they required, so that the inside of the quarry presented a long gallery from whence the stone had been taken, worked in a very regular manner in steps one above the other, without any appearance of waste; in fact, the rock is so solid that when worked by pick and wedge no blasting is necessary ”

“ The specus is six feet high and two feet wide, and it is filled up to nearly half its height by solid clay, evidently the deposit left by the water. The old specus, long after it had been out of use, seems to have been employed by the quarrymen: as it was a tunnel in the tufa rock just high and wide enough for a man to walk in, by cutting away one side they made it wide enough for a horse and cart to carry the stone, and they raised the vault as high as was convenient for the purpose of making an entrance into the quarry. ”

“ That the spot should have been visited for untold centuries by all the Indian nations, who hid their weapons as they approached it, under fear of the vengeance of the Great Spirit, will not seem strange when the religion of the race is understood. One of the principal features of the quarry is a perpendicular wall of granite about thirty feet high, facing the west, and nearly two miles long. At the base of the wall there is a level prairie, running parallel to it, half a mile wide. ”

“ Now he had forsaken the trails of moose and bear and caribou to seek the elusive "color" in the sands of the mountain streams, or the unobtrusive outcrop of the quartz that carries gold. But the old instincts were still strong in him. He felt the lure of a splendid and unknown quarry. He coveted the magnificent head of that calm watcher on the peak; and, having heard that the wild mountain ram of the Rockies was an extraordinarily difficult quarry to bring down, he itched to try his old eastern woodcraft in this new chase and win the prize unaided. ”

“ The whole of this structure is composed of fine marble, closely put together in beautiful order, but no cement has been used to fasten the stones together; yet so solid are they that, so far as the ravages of time are concerned, the pile may be pronounced quite uninjured. It is a matter of wonder to the beholder how such enormous stones came to be conveyed from the quarry, and raised to their proper places, in an age when means of conveyance were but limited. ”

“ At Aberdeen, we found that many additional quarries had lately been opened, some of them of an excellent quality, and capable of producing larger blocks of stone than granite quarries usually do; but still it is doubtful, as has been formerly mentioned, whether any one quarry will be found to produce a sufficiency of large blocks in any reasonable time; but by purchasing from different quarries, a regular supply may be procured for all the purposes wanted, in case you shall determine upon using the granite in preference to stones from Kingoodie. ”

“ Indications show that the roof consisted of logs, probably covered with canes supporting a layer of masonry and cement. The quarries of the ancient builders have been discovered in the hills, together with the rude stone picks by means of which they hewed out the blocks, and, as Holmes writes, “the feats of engineering necessary to transport masses of stone many tons in weight down a thousand feet of precipitous mountain-face, accomplished by these stone-age quarry-men, would be regarded as important undertakings, even by our enterprising [179] engineers of to-day.” ”

“ But in unsightly masses of mechanical origin, whether sandstone or clay, I could take no interest; just as infant societies take no interest in such masses, and so fail to know anything of geology; and it was not until I had learned to detect among the ancient sandstone strata of this quarry exactly the same phenomena as those which I used to witness in my walks with Uncle Sandy in the ebb, that I was fairly excited to examine and inquire. It was the necessity which made me a quarrier that taught me to be a geologist. ”

“ A large portion of these chambers has been made into a cistern or reservoir.
After a visit to what is called the Pool of Bethesda and the Church of St. Anne, we went outside the city wall on the north side and entered what looks like a cave, but upon investigation proves to be an extensive underground quarry. These excavations, called Solomon's Quarries, extend, according to one authority, seven hundred feet under the hill Bezetha, which is north of Mt. Moriah. The rock is very white, and will take some polish. ”

“ The stone dug from it, appears, from its external characters, to consist of quartz and cherts. When first taken out of the soil, it is much softer, and more easily wrought into its proper shape, than after it has been exposed to the air, though only for a day. The vein in the quarry contains every variety of the stone, whether cellular, close, hard, or soft, and runs to such a depth, that the industrious discoverer considered it as inexhaustible. ”

“ It is almost a personal triumph to us to know that the broken bits of rock from the quarry, unfit to use as building material, are turned into crushed stone, for which there is so large a demand, thanks to the increasing popularity of concrete, and that its revenues pay the operating expenses of the quarry, and make the price got from building stone so much clear money. ”

“ Owing to the great igneous and volcanic activity at the close of the deposition of the carboniferous system of strata, the coal-measures exhibit what are known as faults in abundance. The mountain limestone, where it outcrops at the surface, is observed to be much jointed, so much so that the work of quarrying the limestone is greatly assisted by the jointed structure of the rock. ”

“ Rock taken from the surface, which has been exposed to the atmosphere, is of an inferior quality to that found at a depth where it has been exposed to a strong pressure; and is consequently denser. Therefore, in opening a quarry it is advisable to excavate upon a hill-side and come at once to the sound stone. Rock is generally found in beds, divided by joints or seams, at which the natural adhesion is broken and the layers are easily separated. ”