Commerce of the Prairies

1806 – 1850

Commerce of the Prairies: or, The journal of a Santa Fé trader, 1831–1839 was written by Josiah Gregg (1806–1850), a merchant, explorer, naturalist, and author who described his travels and adventures throughout the American Southwest and Northern Mexico. He is most famous for this book, a classic description of his early travels along the Santa Fe Trail to Santa Fe, then along El Camino Real to Chihuahua, Mexico and further south.

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"After fording the Rio Cármen, which, though usually without a drop of water in its channel, we now found a very turbulent stream, we did not meet with any object particularly worthy of remark, until we reached the Laguna de Encinillas [Lake of Live-Oaks, the size varies greatly with the season of drouth or rain.—Book Editor]. This lake is ten or twelve miles long by two or three in width, and seems to have no outlet even during the greatest freshets, though fed by several small constantly flowing streams from the surrounding mountains. The water of this lake during the dry season is so strongly impregnated with nauseous and bitter salts, as to render it wholly unpalatable to man and beast. The most predominant of these noxious substances is a species of alkali, known there by the title of tequesquite. It is often seen oozing out from the surface of marshy grounds, about the table plains of all Northern Mexico, forming a grayish crust, and is extensively used in the manufacture of soap, and sometimes by the bakers even for raising bread. Here we had another evidence of the alarming effects of the recent flood, the road for several miles along the margin of the lake being completely inundated. It was, however, in the city of Chihuahua itself that the disastrous consequences of the freshet were most severely felt. Some inferior houses of adobe were so much soaked by the rains, that they tumbled to the ground, occasioning the loss of several lives."

- Commerce of the Prairies

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"The moliendas, or crushing-mills (arrastres, as called at some mines), employed for the purpose of grinding the ores, are somewhat singular machines. A circular (or rather annular) cistern of some twenty or thirty feet in diameter is dug in the earth, and the sides as well as the bottom are lined with hewn stone of the hardest quality. Transversely through an upright post which turns upon its axis in the center of the plan, passes a shaft of wood, at each end of which are attached by cords one or two grinding stones with smooth fiat surfaces, which are dragged (by mules fastened to the extremities of the shaft) slowly around upon the bottom of the cistern, into which the ore is thrown after being pounded into small pieces. It is here ground, with the addition of water, into an impalpable mortar, by the constant friction of the dragging stones against the sides and bottom of the cistern. A suitable quantity of quicksilver is perfectly mixed with the mortar; to which are added some muriates, sulphates, and other chemical substances, to facilitate the amalgamation. The compound is then piled up in small heaps, and not disturbed again until this process is supposed to be complete, when it is transferred to the washing machine. Those I have observed are very simple, consisting of a kind of stone tub, into which a stream of water is made to flow constantly, so as to carry off all the lighter matter, which is kept stirred up by an upright studded with pegs, that revolves in the center, while the amalgamated metals sink to the bottom. Most of the quicksilver is then pressed out, and the silver submitted to a burning process, by which the remaining portion of mercury is expelled."

- Commerce of the Prairies

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