re than very partially, in matral science; but of the common tory, they were as capable of we fail to see any reason for leaving them to fall into error in that quarter, very weighty considerations suggest the imen as we are now, and while portance of their being secured against it. From the London Quarterly. GOLD IN ITS NATURAL SOURCES.* not about to treat of gold as | vailed on some of these points. These auri sacra fames, or after the opinions, however, are scarcely known to a prize-essay against covetous- the general public, nor should we be able our aim will be to bring be- to conceive of the wide and gross ignoreaders in one view what we ance of the mass of people on such matenabled to learn from many ters, if we did not see how extensively specting the natural sources of certain companies just expired have been geological and mineralogical able to win golden opinions from all sorts which appear to govern its de- of men. Of these companies we shall d the mode of its occurrence, have a word to say at the end of our paith its geographical distribu- per. It is singular that, out of the nuous parts of the world. It is merous recent travelers' books on the the last few years that opin- Californian and Australian discoveries of of scientific name have pre- gold, scarcely one that we have seen has much scientific information of value. It will be as well, too, to indicate the probable limits of auriferous repositories, so that men may at least know in what kinds of places gold may be found, and where it will certainly not be found. To this we shall add some notices of the modes of extraction from the soil and the rock, and the most reliable statistics of the actual produce of gold in our day, especially from Australia and California. In the present paper, we shall confine our observations to gold, only referring to silver in some statistical statements of the returns of the precious metals collectively. Incidentally, we shall glance at some topics of special interest. on the Production of the Precious the Depreciation of Gold. By M. ALIER, Translated by D. FORBES 1. London. 1853. and Gold; or, Two Years in Vic WILLIAM HOWITT. Two Volumes. been living at the time, he might for Dr. Conquest's prize, since, in compter on gold, he speaks thus: "Oh! gold was clean gone! Would God bly be quite abolished among men, s it doth, into such a cursed and exafter it-if I may use the words of I writers-a thing that the best men proached and railed at, and the only it for the ruin and overthrow of man blessed world was that, and much is wherein we live, when, in all the en men, there was no coin handled, e traffic was managed by bartering gware for ware, and one commodity the practice was in the time of the Homer, a writer of good credit, doth And first, it will be interesting to learn how far gold was known to the ancients, and whence they gathered it. Gold, being always found in its native or metallic state, and being remarkable for its beau would attract the eye | all his drinking-vessels were of gold, and , borne as they have Ninus, the founder of Nineveh, and 3. ustan period was subject. The those of the Uralian chain, afforded a ounts are as follows: Amount. £358,000,000 322,200,000 259,182,000 209,937,420 163,749,304 107,435,924 e had reached, in the year 806, of £33,674,256. gular that no Grecian or Roin fact, any ancient writer, e left us a treatise on the mines of the precious metals to the The absence of such a treatise nore when we attempt to realaccumulations just mentioned. we have a Columella De Re id a Vitruvius on Architecture, re no author De Re Metallica, read of any such author. Some Pliny's Natural History, and a ed sentences in Herodotus and all we have appertaining to . Would that some idle man nan Empire had devoted himinteresting a topic; and that stead of sipping his Chian or wines, or Martial, instead of lly epigrams, had given to all viceable treatise upon it! As nly writer on the Grecian meh is a modern German, Boeckh, 8 Public Economy of Athens, a learned dissertation on the es of Laurion, in which he has d the subject with great cri ere gold mines in Thrace and of Thasus. Thessaly produced h were rich in gold. The Solomon were derived from ought to be the modern Sofala Pallas describes the remains cient mines, (perhaps of the and Lepechin and Gmelin viremains of very early mining he eastern borders of the Ural That gold region still yields nt of the metal. It is evident gold was procured from the ubia and Ethiopia. These, like Ophir was, has puzzled many geoay. Huet and Bruce have placed it at Africa. Some seek it in the land of e capital is Sophar, or Taphar. Calmet menia, at the head of the Euphrates. copper which yielded gold, and which the Africans knew how to separate. Belzoni proves that a very extensive tract had been worked in the Sahara mountains. The Pharaohs derived their wealth from these sources at the expense of much human suffering and loss of life. Mr. Jacob infers that not less than £6,000,000 sterling of the precious metals were derived from these mines, and that a large proportion of this must have been gold. Croesus may have derived gold from the auriferous sands of the river Pactolus in Lydia. The Romans obtained their supplies of precious metals from various sources; and in fact monopolized as much of the mining produce of the world as they could. Some of their sources were Upper Italy, the province of Aosta, the Noric Alps, and Illyria. Anciently Spain yielded an abundant supply of the precious metals, which her quicksilver served to refine. According to Pliny, the Asturias, Galicia, and Lusitania yielded £20,000 of gold annually. Silver of the best quality was found in still greater quantities in that country. Both the Carthagenians and the Romans appear to have derived immense supplies from Spain. It is said that the single mine of Belbel yielded to Hannibal £300 aday; and we learn from Strabo, that after Spain had been reduced to complete subjection by the Romans, these proud conquerors drew from it upwards of £110,000 of silver in the space of nine years, or at the rate of about £12,400 annually. Polybius speaks of the silver mines in Spain in the neighborhood of Carthago Nova, which yielded every day 25,000 drachmas to the Roman ærarium; and Pliny mentions, as amongst the most productive mines belonging to the Roman Republic, rich gold mines near Aquileia, a town of Ictimuli, near Vercelli, in which 25,000 men were constantly employed.* When a new world was opened to us by the discovery of America, in 1492, new sources of the precious metals were also presented. From the year 1492 to 1500, America furnished to Europe gold and silver to the value of £52,000. In 1502, Orlando dispatched about £70,000; but *Pliny's "Natural History," 33: 4. The number of men employed must be overstated; at least, if they were employed in mining. GOLD IN ITS NATURAL SOURCES. ched Spain. Up to produce of American greater than £52,000. From Mexican mines... Add for contraband. [July, £364,847,739 273,293,356 Total from Spanish America.. £706,464,434 ere wrecked, and little | stated, the gross amount from Peru, Co- Grand total from the Americas £786,464,434 ig. The gold-dust of Africa, with the gold and silver of Europe, may be estimated at the annual value of £900,000. The annual value of the precious metals from Spanish and Portuguese America being about £7,000,000, (according to the above view,) the annual increase of the wealth of Europe, during the last century, was at the rate of £8,000,000, as nearly as we can arrive at it. teenth century, the silver was still mainly Americas; the great Valenciana producing per annum for forty t of Zaccatecas adding t: these sources were, iling toward the end detailed list of these Humboldt, in periods 1700 to 1809. The he whole time of 110 183. Such is the sum m the several mints. added the gold and ich did not pay duty, er channels, equal to total amount would £364,847,739. This 1 average product of rmore, we must add from Mexico, as just It is not an easy thing to estimate the produce of the precious metals since 1810; but, from the calculations of M'Culloch, who relies on the authority of Humboldt, we may estimate the annual produce of the American mines as equaling £8,700,000. In 1840, the American mines were estimated to yield a produce equal to £5,600,000 per annum. As we have thus arrived at our own days, let us turn aside for a time from mere statistical statements, and, before we return to figures, look at the geological occurrence and geographical distribution of gold. Gold is found, as to geological position, in the primary groups of rocks, including the "transition strata " of earlier writers; which, as they contain the oldest organic remains, have been recently denominated "palæozoic." This series constitutes the dorsal spine of the great mountain chains of both the Old and New World. There are, however, vast regions, amounting, perhaps, to three fourths of all known lands, where no such rocks appear. Experience has shown that it is only in the palæozoic group of rocks, as above defined, (including certain associated igneous t gold has been found in quanient to pay for working. All cones, or rock masses, from ich gold has been derived, by natural catastrophes or by eavor,) belong to the primary ion groups, and especially to ions of them which have been y the eruption of matter in a sion, or at a very elevated temIt is now thought that the ig rocks are not confined to geographical zones, as formerly but they are found protruding ess as meridional bands in all here the primary series of rocks nd prominent. primæval breakers, waves, and cted on the rocks containing er it were disseminated through of the rock, or confined to the is traversing it, fragments of the rock would be detached equally pieces. Such fragments, either orn, or altogether broken and ›wn, would afterward be found t-clays, sands, and gravels, and all probability be much richer in the actual gold-bearing rocks 3. A current of water having force to bear down sand, or quartz, or any other rock of specific gravity, might not be ove along associated fragments nich metal has a specific gravity . Moving water has, therefore, effected upon the auriferous I which the miner would now hely, has broken them up into swept away the lighter parleft the gold behind. are great natural cradles, (to er's term,) sweeping off all the d finer particles at once, the nes remaining lodged against al impediments, or being left current slackened in force or These are the reasons why the drift may become richer in the mass of the rock from s derived; and there are other so, why the auriferous drift of first deposited after the formaold, should be richer than any one. dering the action of currents , we discover the causes of the of gold in alluvium. Very large of gold, or even of quartz, or other rock containing much gold, would not be carried far by any imaginable stream of water. The discovery therefore, of the larger pieces of gold, named nuggets, is equivalent to the discovery of the neighboring parent site; when we find the one, we can not be far from the other, even though we cannot penetrate to its depths. On the contrary, gold dust, in scales or spangles of the metal, may be transported to considerable distances. From such differences may arise a fairly equable distribution of gold over large spaces of drift; for the waters, which had power enough to move the large fragments a few hundred yards, would carry the smaller ones some miles away. In the former case, rich lumps would be deposited sparingly here and there; in the other, scales and spangles would be scattered like broadcast seed from the sower, and cast equally over the wide spaces where the currents began to lose their force and speed. When we find gold in the sands of rivers, we must not conclude that it was detached from the rock by the actual water of those rivers. It may have been thus detached to a small extent, but rivers would scarcely be able to abrade many auriferous spots in these beds of rock. On the contrary, we must look still further back to the older drifts, which would be naturally accumulated in the lowest hollows and depressions of the surface of rocks, or in the preexisting valleys; and as the rivers of a country naturally follow the same course, it is from these loose and incoherent materials that a river derives its store of gold. We may presume that a river which traverses a country of auriferous drift by its action resifts and reässorts the materials that have once been sifted by the waters in which the drift was formed, carrying forward all the matters that fall into it, but soon depositing the heavier matters, and sweeping off all the lighter particles into distant and lower regions. If we stand upon a hill in our own country, and glance at the windings of some subjacent river, we observe that, as it winds through the valley, it attacks first one bank and then another, eating into the base of a cliff where the full force of the current rolls against it, and causing the continual fall of small portions of it into the water, and then depositing them below, in places where the current is checked by some impediment. It is thus |