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Updated: May 24, 2025
I have been a quartz miner in the silver regions a pretty hard life; I know all the palaver of that business: I know all about discovery claims and the subordinate claims; I know all about lodes, ledges, outcroppings, dips, spurs, angles, shafts, drifts, inclines, levels, tunnels, air-shafts, "horses," clay casings, granite casings; quartz mills and their batteries; arastras, and how to charge them with quicksilver and sulphate of copper; and how to clean them up, and how to reduce the resulting amalgam in the retorts, and how to cast the bullion into pigs; and finally I know how to screen tailings, and also how to hunt for something less robust to do, and find it.
In the improved arastra the paving fits so closely together, that the quicksilver and amalgam do not get down between them, but remain on the surface, and can readily be brushed up into a little pan, and therefore cleaning up is much less troublesome and is more frequently repeated than in the rude arastras; besides there is a greater need of frequent cleaning up in the improved arastras, because the amount of work done within a given time is usually greater.
I have been a quartz miner in the silver regions a pretty hard life; I know all the palaver of that business: I know all about discovery claims and the subordinate claims; I know all about lodes, ledges, outcroppings, dips, spurs, angles, shafts, drifts, inclines, levels, tunnels, air-shafts, "horses," clay casings, granite casings; quartz mills and their batteries; arastras, and how to charge them with quicksilver and sulphate of copper; and how to clean them up, and how to reduce the resulting amalgam in the retorts, and how to cast the bullion into pigs; and finally I know how to screen tailings, and also how to hunt for something less robust to do, and find it.
On each arm of this bar is attached by a chain a large flat stone or muller, weighing from three hundred to five hundred pounds. It is so hung that the forward end is about an inch above the bed, and the hind end drags on the bed. A mule hitched to one arm will drag two such mullers. In some arastras there are four mullers and two mules.
The arastra is the simplest instrument for grinding auriferous quartz. It is a circular bed of stone, from eight to twenty feet in diameter, on which the quartz is ground by a large stone dragged round and round by horse or mule-power. There are two kinds of arastras, the rude or improved. The rude arastra is made with a pavement of unhewn flat stones, which are usually laid down in clay.
In many mills quicksilver is placed in the battery, two ounces of quicksilver for one of gold; and about two-thirds of the gold is caught thus. The copper plate in quartz-mills is made in the same manner as in placer-sluices, under which head a description of the plate may be found. Some amalgamating bowls or basins are little Chilean mills and arastras, made of cast iron.
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