I was now at the capital of the mines, and in a position most favourable for obtaining true information of their character and value. Three months devoted to this object left scarcely a nook of the country which I had not either personally explored, or obtained authentic information of. I found forty-five principal mines, or mineral _diggings_ as some of them are called, within a circumference of less than forty miles. Potosi, and its vicinity yielded annually about three millions of pounds of lead, and furnished employment to the estimated number, of eleven to twelve hundred hands. The business was however depressed, like almost every other branch of domestic arts or industry, after the peace of 1814, owing to the great influx and low prices of foreign products, and the general derangement of currency and credit. Prepared ore, delivered at the furnaces, was worth two dollars per cwt., paid chiefly in merchandize. Pig lead sold at four dollars, at the mines; and but half a dollar higher on the banks of the Mississippi, and was quoted at seven dollars in the Atlantic cities. Judged from these data, there appeared no adequate cause for the alleged depression; for in addition to the ordinary merchant's profit, in the disposition of his stock to the operative miner or digger of ore, a profit of one cent and a half per pound was left, over and above the cost of transportation to an eastern market; besides, the difference in exchange, between the south western and eastern cities. And it was evident, from a view of the whole subject, that the business could not only be profitably pursued, with economical arrangements, but that the public domain, upon which most of the mines are seated, might be made to yield a revenue to the treasury, at least equal to the amount of this article required for the national consumption, over the expenses, the superintendence and management. Besides which, there was great room for improved and economical modes of mining; and there was hardly one of the manipulations, from the making of a common drill or pick, to the erection of a smelting furnace, which did not admit of salutary changes for the better. The recovery of the mere waste lead, in its sublimated form, around the open log furnaces of the country, promised to add a valuable item to the profit of the business. The most wasteful, hurried, and slovenly of all systems is pursued in exploring and raising the ore, by which the surface of the country is riddled with pit holes, in the most random manner; the loose and scattered deposits in the soil hastily gathered up, and the real lead and veins of metal left, in very many cases, untouched. Thousands of square acres of land were thus partially rifled of their riches, and spoiled, and condemned, without being exhausted. By having no scientific knowledge of mineral veins and geological structure, as practically adopted in Europe, all rule in the process of mining and raising the ore