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Careful dissolving of the pyrites and gangue so as to leave the gold intact failed to find it in any larger diameter. As this was a very unusual experience in investigations on many other kinds of pyrites, I was led further into the matter. "Ultimately, after a number of experiments, there was nothing left but to test for gold existing as a natural sulphide.
The pyrites of sulphur and motes of iron, that formerly gleamed in the rills that trickled down its slopes, were now big as cascades, filled with carbuncles and rocks of amethyst.
This reaction then must be in progress at the present time, and doubtless under certain conditions pyrites would eventually take the place of the timber, as is the case with some of the long buried driftwood found in Victorian deep leads.
Towards night, as we approached to the foot of Mount Vesuvius, our galleys were covered with ashes, the showers of which grew continually hotter and hotter; then pumice stones and burnt and broken pyrites began to fall on our heads, and we were stopped by the obstacles which the ruins of the volcano had suddenly formed, by falling into the sea and almost filling it up, on that part of the coast.
After a night of feverish tossing on his bed he arose and went to the cellar to gloat upon his wealth. The light of dawn fell on a heap of gray dust, a few brassy looking particles showing here and there. The curse of the ghost had been of power and the silver was silver no more. Mineralogists say that the nodules are iron pyrites. Perhaps so; but old residents know that they used to be silver.
Wilkinson found that when the solution of gold chloride was as strong as, say, four grains to the ounce of water, that the pyrites or other base began to decompose, and the iron sulphide changed to yellow oxide, the "gossan" of our lodes, and that though the gold was deposited, this occurred in an irregular way, and it was coated with a dark brown powdery film something like the "black gold," often found in drifts containing much ferruginous matter.
Although the metal miner is subjected to fewer accidents than are his brethren working in coal mines, the atmosphere in the former is far more destructive to human life. In lead mines, the duration of life averages scarcely more than thirty-two years, and in those containing arsenical pyrites or quicksilver ores, the average is still lower.
In coal, bands of bright shining iron pyrites are constantly seen, even in the homely scuttle, and when coal is washed, as it is in some places, the removal of the pyrites increases the value of the coal, whilst it has a value of its own.
"Pitcairn's opinion is thought a lot of. The Geologic Survey men listen to Pitcairn. He helped them one year. He's one of those extraordinary old miners who can tell from the look of things, without even panning. When he saw that pyrites on Idaho Bar he stopped dead. 'This looks good to me! he said, and, Jee-rusalem! it was good!"
The water was full of iron pyrites, and had first lined the tube with iron crystals and then filled up the whole hollow with a frosted network of the same. There is a striking contrast between the presence and realism of these once living things still preserving the outer forms of life and the vast and inconceivable distances of "geological time."
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