The wonders of the world

by John Loraine Abbott

The subterraneous passages of the great mine are so extensive, that it would require several hours to pass through them. The greatest perpendicular depth, computing from the entrance of the shaft, is eight hundred and forty feet; but as these passages advance horizontally, under a high mountain, the depth would be much greater if the measure were taken from the surface. One mode of descending the shaft is by a bucket, but as the entrance is narrow, the bucket is liable to strike against the sides, or to be stopped by some obstacle, so that it may be readily overset. A second mode of descending, which is safer, is by means of a great number of ladders, placed obliquely, in a kind of zigzag: as the ladders, however, are wet and narrow, a person must be very cautious how he steps, to prevent his falling. In the course of the descent, there are several resting-places, which are extremely welcome to the wearied traveler. In some of the subterraneous passages, the heat is so intense as to occasion a profuse sweat; and in several of the shafts the air was formerly so confined, that several miners were suffocated by an igneous vapor, or gaseous exhalation, called the fire-damp. This has been prevented by sinking the main shaft deeper. Near to it is a large wheel, and a hydraulic machine, by which the mine is cleared of water.

To these pernicious and deadly caverns, criminals are occasionally banished by the Austrian government; and it has sometimes happened that this punishment has been allotted to persons of considerable rank and family. The case of Count Alberti is an interesting instance of this kind.

The count, having fought a duel with an Austrian general, against the emperor’s command, and having left him for dead, was obliged to seek refuge in one of the forests of Istria, where he was apprehended, and afterward rescued by a band of robbers who had long infested that quarter. With these banditti he spent nine months, until, by a close investment of the place in which they were concealed, and after a very obstinate resistance, in which the greater part of them were killed, he was taken and carried to Vienna, to be broken alive on the wheel. This punishment was, by the intercession of his friends, changed into that of perpetual confinement and labor in the mines of Idria; a sentence which, to a noble mind, was worse than death. To these mines he was accompanied by the countess, his lady, who belonged to one of the first families in Germany, and who, having tried every means to procure her husband’s pardon without effect, resolved at length to share his miseries, as she could not relieve them. They were terminated, however, through the mediation of the general with whom the duel had been fought, who as soon as he recovered from his wounds, obtained a pardon for his unfortunate opponent; and Alberti, on his return to Vienna, was again taken into favor, and restored to his fortune and rank.

IRON MINES.

The metal which is called iron, is familiar to all, both for its value and its various uses. It is capable of being cast in molds of any form; of being drawn in wires, extended in plates or sheets, of being bent in every direction, and of being sharpened, hardened, or softened at pleasure. It accommodates itself to all our wants, desires, and even caprices; it is equally serviceable to the arts, the sciences, to agriculture, and to war; and the same ore furnishes the sword, the plowshare, the scythe, the pruning-hook, the needle, the graver, the spring of the watch or that of the carriage, the chisel, the chain, the anchor, the compass, the cannon, the bomb, the edge of the finest knife or razor, and the ponderous trip-hammer of enormous weight. It is a medicine of much virtue, and the only metal which is always useful, and tends to no injury to mankind.

The ores of iron are scattered over the entire crust of the globe in beneficent profusion, and in proportion to the utility of the metal itself: they are found in every latitude and zone, in every mineral formation, and in every soil and clime. These ores are nineteen in number, ten of which are worked to profit by the miner, either for the sake of the iron they contain, for use in their native state, or for extracting from them some principle or material, useful in manufactures or the arts.

Native iron, the existence of which was formerly questioned, has been found in several places: it is, however, far from being common, though it occurs in several mines. A mass of this description of iron was discovered in the district of Santiago del Estero, in South America, by a party of Indians, in the midst of a widely extended plain. It projected about a foot above the ground, nearly the whole of its upper surface being visible; and the news of its having been found in a country where there are not any mountains, nor even the smallest stone, within the circumference of a hundred leagues, was considered as truly surprising. Although the journey was attended with great danger, on account of the want of water, and abundance of wild beasts in these deserts, several individuals, in the hope of gain, undertook to visit this mass; and, having accomplished their journey, sent a specimen of the metal to Lima and Madrid, where it was found to be very pure soft iron.

As it was reported that this mass was the extremity of an immense vein of the metal, a metallurgist was sent to examine the spot, and by him it was found buried in pure clay and ashes. Externally it had the appearance of very compact iron, but was internally full of cavities, as if the whole had been formerly in a liquid state. This idea was confirmed by its having, on its surface, the impression of human feet and hands of a large size, as well as that of the feet of a description of large birds, very common in South America. Although these impressions seemed very perfect, it was concluded either that they were lusus naturæ, or that impressions of this kind were previously on the ground, and that the liquid mass of iron, in falling on it, received them. It had the greatest resemblance to a mass of dough; which, having been stamped with impressions of hands and feet, and marked with a finger, had afterward been converted into iron.

On digging round the mass, the under surface was found covered with a coat of scoriæ from four to six inches thick, undoubtedly occasioned by the moisture of the earth, the upper surface being clean. No appearance of the formation of iron was observed in the earth, below or round it, for a great distance. About two leagues to the eastward was a brackish mineral spring, and a very gentle ascent of from four to six feet in hight, running from north to south: with this exception, the adjacent territory was a perfect level. About the spring, as well as near the mass, the earth was very light, loose, and greatly resembling ashes, even in color. The grass in the vicinity was very short, small, and extremely unpalatable to the cattle; but that at a distance was long, and extremely grateful to them. From these concurrent circumstances it was concluded, that this mass of native iron, which was estimated to weigh about three hundred quintals, was produced by a volcanic explosion. It is stated as an undoubted fact, that in one of the forests of the above district of Santiago del Estero, there exists a mass of pure native iron, in the shape of a tree with its branches. At a little depth in the earth are found stones of quartz, of a beautiful red color, which the honey-gatherers, the only persons who frequent this rude territory, employ as flints to light their fires. Several of these were selected on account of their peculiar beauty, they being spotted and studded, as it were, with gold: one of them, weighing about an ounce, was ground by the governor of the district, who extracted from it a dram of gold.

A fibrous kind of native iron has been found at Ebenstock, in Saxony, and also in Siberia, where one particular mass weighed sixteen hundred pounds. It resembled forged iron in its composition, and was malleable when cold, but brittle when red-hot. In Senegal, where it is most common, it is of a cubical form, and is employed by the natives in the manufacture of different kinds of vessels. Native meteoric iron, called also nickeliferous, from its containing nickel, and native steel iron, which has many of the characters of cast steel, have also been found.