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Updated: May 14, 2025
Miners frequently show visitors the fineness of their gold by putting some of the dust in a vial with water, and upon shaking, the particles of metal can be seen floating about in the clear water. Riffles, and all the devices to get the benefit of specific gravity, are of little use to arrest this "float-gold," so amalgamation is employed.
These strata were apparently deposited in a lagoon of more modern date. The gold is sometimes visible in the gneiss; and I have seen pieces whose surface is dotted with yellow spots resembling pyrites. It is often in the form of spangles called float-gold and flour-gold. Select specimens have yielded upwards of eight ounces to the ton.
A handful, taken from a few inches below the surface, shows glittering specks of 'float-gold, scales so fine that it was difficult to wash them by machinery. Mem. This is what women do every day on the Gold Coast. The Colonist says that a San Francisco company has at length hit upon the contrivance.
The slowness of the current and the shallowness of the water are important, for with a swift current or deep water many of the particles of float-gold may escape without touching the quicksilver. Wherever a speck of gold has fixed itself on the plate, there others will collect about, evidently preferring to fix themselves in a neighborhood rather than in a waste place.
Washing will be easier during the Rains, when the dirt is looser; in the Dries hard and compact stuff must be loosened by the pick and spade or by blasting. There will not be much loss by float-gold, flour-gold, or paint-gold, the latter thus called because it is so fine as to resemble gilding.
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