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Updated: May 9, 2025
This is also practised in Africa to-day, and we have seen that the Koreans, with Mongolian acuteness, have gone a step farther, and pulverise the quartz by rocking one stone on another. In South America the arrastra is still used, which is simply the application of horse or mule power to the stone-grinding process, with use of mercury.
Then Indian women winnowed out the chaff and dirt by tossing the grain up in the wind, or from basket to basket, till in this slow way the yellow kernels were made clean and ready to grind. A curious mill, called an arrastra, ground the grain between two heavy stones. A wooden beam was fastened to the upper stone, and oxen or a mule hitched to this beam turned the stone as they walked round.
Thus it will probably be found practicable to crush dry and amalgamate semi-dry by passing the material in the form of a thin pasty mass to a settler, as in the old South American arrastra, and, by slowly stirring, recover the mercury, and with it the bulk of the gold.
Below the Town of the Grape Vines, which shortens to Las Uvas for common use, the land dips away to the river pastures and the tulares. It shrouds under a twilight thicket of vines, under a dome of cottonwood-trees, drowsy and murmurous as a hive. Hereabouts are some strips of tillage and the headgates that dam up the creek for the village weirs; upstream you catch the growl of the arrastra.
Below the Town of the Grape Vines, which shortens to Las Uvas for common use, the land dips away to the river pastures and the tulares. It shrouds under a twilight thicket of vines, under a dome of cottonwood-trees, drowsy and murmurous as a hive. Hereabouts are some strips of tillage and the headgates that dam up the creek for the village weirs; upstream you catch the growl of the arrastra.
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