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Updated: July 21, 2025
One or two prospectors have passed through a portion of it, and they speak well of its pastoral and, possibly, auriferous value. Cut off, as it is, by the desert, the district has the disadvantage of none but sea communication with the rest of the Colony.
But in rocks with metalliferous veins the miner does not at once know all he has to work. He may chance to lengthen the labours, to go deep, and to cross other accompanying veins. Alluvial soils are generally of small depth where they are auriferous; they most frequently rest upon sterile rocks.
The slow sapping of the winter rains had loosened the soil from the auriferous rock, even while the swollen stream was carrying their impotent and shattered engines to the sea. What mattered that his single arm could not lift the treasure he had found! What mattered that to unfix those glittering stars would still tax both skill and patience!
I sprang to my feet in astonishment, and realised in a moment that this great mass of rock was auriferous to an enormous degree, and there was one gigantic nugget, spread out tentacle-wise in it, which if removed would, I am sure, be as much as a couple of men could carry. Week after week passed by, and still we continued our southward march.
The board-sluice is a long wooden trough, through which a constant stream of water runs, and into which the auriferous dirt is thrown. The water carries away the clay, sand, gravel and stones, and leaves the gold in the bottom of the sluice, where it is caught by its gravity and by quicksilver.
Foote in the same order, i.e., from south to north, and he tells us that the auriferous localities in this group occur all in small detached strips or patches of schistose rock scattered over the older gneissic series. Mr.
Sir Charles, I ought to say, had secured during that summer a very advantageous option in a part of Africa on the Transvaal frontier, rumoured to be auriferous.
What really happened was that the winter floods detached portions of auriferous drift from the banks, which, being disintegrated by the rush and flow of the water, would naturally deposit in the still reaches and eddies any gold that might be contained therein. The mode of washing was exactly that carried on by the natives in some districts of Africa to-day.
We were not to look for auriferous alluvium in the bed of any present existing stream, but in the "cement" or dried-up bed of the original prehistoric rivers that formerly ran parallel with the present bed, and which he demonstrated with the stem of Pickney's pipe in the red dust could be found by sinking shafts at right angles with the stream.
The reduction of silver ore costs on an average, from three to five times as much as the reduction of auriferous quartz. The silver ore of Esmeralda and Coso is a sulphuret of silver, nearly all the veins having the same material, though the amount of it scattered through the vein-stone differs greatly in different lodes.
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