Iron mine

“ Iron, in rich lodes of red and brown ore, has been found in great abundance, in many parts of the county, but there are not any iron mines which have been much worked.—Iron Pyrites, or sulphuret of iron, occur in most of the veins of copper, as well as some magnetical iron ore at Penzance, and specular iron ore at Tin Croft Mine, in Illogan, Botallack Mine, near the Land’s End, and other places. ”

“ Most of the British iron mines are situated in those districts where coal is cheapest, the ore being often even raised from the same pit as that from which the coal is extracted. Limestone, the necessary flux, is at hand, while fire-clay, no unimportant article in the building of the furnaces, on whose long-continued working so much depends, is found in the same ground as the ore itself. The largest and most complete manufactories have long been established in the most convenient places. ”

“ The annual consumption of iron ore in France for the manufacture of pig iron and crude iron and steel products amounts to about 12 million tons under normal conditions. The productive capacity of the iron mines of France is more than 21 million, leaving a surplus of 9 million tons of ore annually available for export. More than 90 per cent. of the iron ore produced in France is obtained from the Lorraine iron mines. ”

“ In shafts and levels for permanent use iron is an economical substitute. Wherever possible, new methods of mining are being introduced. Thus in the Lake Superior iron regions, the mine development is planned along lines almost unheard of ten years ago. In the first place the gravel which overlies the ore is stripped off, even if it is fifty feet thick. This is done with steam shovels, which load the gravel upon cars. These are then pulled away by one locomotive while a second places new “empties” in position to be filled. One shovel will load from 150 to 175 cars a day ”

“ 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. ”

“ Iron is the most important element in modern industries. Its deposits are found in great quantities in certain areas and can be easily mined. The iron mines should be worked absolutely as a state property. Besides the Chili and Shansi iron mines, the other iron fields must also be developed. There are very rich deposits in the southwestern provinces, the Yangtze Valley and the northwestern provinces in China Proper. Sinkiang, Mongolia, Manchuria, Kokonor, and Tibet also possess large deposits of iron. ”

“ Iron mines are more abundant, or at least more abundantly worked, in Europe than elsewhere, though the rapid increase of iron mining in the United States gives promise that our country may in this respect some day rival the old world. Copper mines have been found chiefly in England, Sweden and Denmark; and of late years copper has been found to be abundant in the region of our northern lakes. Lead and tin mines are numerous in England, the latter chiefly in the county of Cornwall; and lead is also found in abundance in the United States. ”

“ Unless this is the case, iron ore cannot be extensively mined excepting under conditions of great abundance and economical methods of transportation, as in the Lake Superior district, where thick and remarkably uniform beds of good ore occur in such a position that water transportation to the market is possible. Where these conditions do not exist, iron-mining is feasible only on a small scale for the local market. Thus, in the Rocky Mountains there are almost inexhaustible supplies of iron, often of a high grade, which are at present of no value whatsoever. ”

“ A deep bed, or a narrow one, or the slightest difficulty in transportation, would preclude any profitable development. It is known that enormous areas in northern Labrador, for instance, are full of iron deposits, yet there seems no chance of their having the slightest economic value for a long time, if ever. Conditions of commerce very different to those now obtaining will have to exist before they can be utilized.
Iron ore is most favorably situated for profitable extraction when it is near coking coal and beds of limestone ”

“ Thus, in Minnesota, in that wonderful Lake Superior country, that is famous as the world's greatest known producer of iron ore, tremendous tonnages are handled every year by the modern steam shovel, which works in natural light by day and by electric lamps at night. In Utah and Nevada we find similar operations conducted in the excavation of copper ores. In Australia, the famous Mount Morgan mine is using open air methods in the mining of precious metal ore. ”

“ This ore is frequently almost as hard as iron itself, many of the pieces thus dislodged being too large for convenient handling, either by the steam shovel or in the chutes at the wharves, and must be still further broken up. This is sometimes done by the men with picks; but in mining on a large scale, where the deposit is all of a very hard nature, crushing machines are used. ”

“ If a ton of rich magnetic ore costs more than $4 at the furnace, good hematite more than $3, and poor ores more than $1.50 or $2, they are too expensive to pay, unless iron is unusually high. Deep mining for iron is not profitable. Generally speaking, a bed of good iron ore, a foot thick, will repay the cost of stripping it of soil, etc., twelve feet thick. ”

“ But we must remember that as the higher grade ores are exhausted it will become necessary to use the lower grades, and that prices will steadily advance as a result.
Iron is sometimes found almost directly under the ground, at other times deep in the earth. That which is found just below the surface is, of course, mined much more easily, more safely, more cheaply, and with far less loss than that which requires deep mining. ”

“ Persons unacquainted with minerals would be unable to discover the slightest affinity between the rough ironstone as brought up from the mine, and the iron or steel of commerce. To unpractised eyes they would seem to possess no properties in common, and it is only after subjecting the stone to severe processes of manufacture that usable metal can be obtained from it. The effectual reduction of the ore requires an intense heat, maintained by artificial methods, such as furnaces and blowing apparatus. ”

“ Within the past few years, immense bodies of iron ore have been discovered in northern Minnesota and the adoption of these immense, mechanically operated shovels has worked such economies in the mining of this kind of ore that entirely new cost figures have been established and tonnages are being produced which, a few years ago, would have seemed unbelievable. ”

“ Annal’s pits, on the eastern side of the Forest, constitute that exceedingly important range of mining operations, from which the Cinderford furnaces have long obtained their chief supply of iron ore. These are four in number, having a height of 43 feet, an extreme breadth of 14 feet, that of the hearth being 6 feet. They make 500 tons every week of the finest hot-blast iron. ”

“ Even miners’ tools are much wanted, the only ones in use being the iron bar and the hoe. The common miner’s pick would in many cases be serviceable, and bucking-irons [65] would reduce the matrix much more effectually than beating it with stones, which is the only mode now practised. It is a most unfortunate circumstance, and very detrimental to the interests of the miners, that whatever is made of iron is so dear as to be beyond the means of the inhabitants to procure, nor have they any substitute for it. ”

“ Though iron is universally distributed throughout creation, it must occur in large beds or deposits before it can be profitably mined. “The most favorable situation of an iron ore for profitable extraction is near good coking coal for smelting and limestone for a flux, as in the Birmingham district of Alabama; and in such a situation even low-grade ores can be worked profitably. ”

“ One naturally wonders how it is possible to mine and carry these ores to the shipping ports of Duluth, Superior, Two Harbors, Marquette, Ashland, Escanaba, etc., put them aboard ore carrying boats, transport them by steam power to Milwaukee, Chicago, Gary, Detroit, Cleveland, Pittsburg, Buffalo, and the many other iron centers and convert them into iron and steel at a profit. This, of course, is only possible because of the inventive genius of man. For every operation ingenious machinery has been constructed which has brought the cost of such operations to its lowest terms. ”

“ In the manufacture of Bessemer steel, which has now largely displaced wrought iron in the arts, it is necessary to use an iron ore of peculiar chemical composition. This ore is found most abundantly and of best quality in the mines of the Vermilion range, lying about one hundred miles north of Duluth, Minn., and in the mines of the Marquette Gogebic, and Menominee regions in the north Michigan peninsula. ”

“ The amount of metal which can be reworked is constantly increasing. Most of the iron factories remelt large quantities of old iron, to be used with the new, and this will lessen each year the demand on the ores. It is also possible that new deposits of iron ore will be found and these will greatly increase the supply. ”

“ Iron ores are widely distributed over the world, but are produced and smelted on a large scale only in a few places where there is a fortunate conjunction of high grades, large quantity, proximity of coal, cheap transportation to markets, and manufacturing enterprise. Over 90 per cent of the iron ore production of the world is in countries bordering the North Atlantic basin. The United States produces about 40 per cent, France about 12 per cent, England about 10 per cent, Germany before the war 15 to 20 per cent, and Spain, Russia, and Sweden each about 5 per cent. ”

“ The last two of these plants are now producing pig iron, which is being sent to Japan. In the future all three plants will probably build steel works. Iron-ore deposits are being mined in connection with all of them. Besides being used in the local blast furnaces, iron ore is being sent to Japan from these mines. In China, the most important iron and steel enterprise is that at Han-yang, in the Province of Hu-peh. This operation was started by the Han-Yeh-Ping Iron & Steel Co., as a Chinese enterprise in connection with the Tayeh mines in the same province. ”

“ Our mines have yielded more iron, in many places more coal, than is wanted; much less iron is now required for trades-tools, machinery, and railroading, than at that not far-distant period when a great deal was consumed in building new roads and erecting new machinery where there had been none before. Mines are bringing up more silver than can be usefully employed; hence it is being hoarded, and its price must sink.
The cotton and the iron are forced upon the converting trades, in which so many mill-hands and factory-operatives are employed. The raw material in excess becomes cheaper. ”

“ The roads are very bad, and so steep, and liable to be affected by the rains, that it would hardly be possible to render the mines very accessible; but still there is no doubt that, in a country where the demand for iron is so great, and where the Mining Districts of Guanajuato and Real del Monte are so near, the speculation might answer.
The English Companies will not commence their works at the Encarnacion, until their other Mines begin to pay. The depth to which the Iron-ore, so rich at the surface, extends, has not yet been ascertained ”

“ In mining, let us observe, the whole round of work consists in separations which bring masses from bigness to smallness, again and again. First of all the solid walls and floors are broken up by pick, or drill, or powder, or all together. Iron ores as hoisted to the surface of the earth are taken to breakers which crush them into pieces suitable for the blast furnace. When the ores carry gold, copper, lead, or tin, this crushing is followed by stamping to facilitate the final process by which metal is separated from worthless rock. ”

“ The increasing demand for iron gave an impetus to coal-mining, which in its turn stimulated inventors in their improvement of the power of the steam-engine; for the coal could not be worked quickly and advantageously unless the pits could be kept clear of water. Thus one invention stimulates another; and when the steam-engine had been perfected by Watt, and enabled powerful-blowing apparatus to be worked by its agency, we shall find that the production of iron by means of pit-coal being rendered cheap and expeditious, soon became enormously increased. ”

“ The forge-blast was also worked for the most part by water-power. Where the furnaces were small, the blast was produced by leather bellows worked by hand, or by a horse walking in a gin. The foot-blasts of the earlier iron-smelters were so imperfect that but a small proportion of the ore was reduced, so that the iron-makers of later times, more particularly in the Forest of Dean, instead of digging for ironstone, resorted to the beds of ancient scoriae for their principal supply of the mineral. ”

“ At the average annual rate of iron ore output in the years 1968 and 1969 the reported life span of the deposits indicates a reserve of only 133 million tons as of 1970. Whatever the actual reserves may be, domestic iron ore has had to be supplemented by imports of about 1 million tons per year from the Soviet Union and Algeria to meet the requirements of the metallurgical industry. ”