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Updated: May 24, 2025
With regard to that found in quartz lodes finely disseminated through the gangue, the change was brought about by the same agency which caused the silicic acid to solidify and take the form in which we now see it in the quartz veins.
The first prospecting is usually done on the hilltops or ridges, because, owing to denudation by ice or water which have bared the bedrock, the outcrops are there more exposed, and thence the lodes are followed down through the alluvial covered plains, partly by their "strike" or "trend," and sometimes by other indicating evidences, which the practical miner has learned to know.
They followed the courses of these streams, and gutted them, sending the gravel up in buckets to the upper world, and washing out of it its enormous deposits of gold. The next biggest of the two monster nuggets mentioned above came from an old river-channel 180 feet under ground. Finally the quartz lodes were attacked. That is not poor-man's mining.
Perak, I should mention, is the Malay word for silver, it having been supposed that vast lodes of that metal abounded in the river valley; but, as a matter of fact, there has been very little silver located anywhere near its vicinity.
Those lodes and pockets of earth, more precious than the precious ores, that yield inimitable fragrance and soft fire; those virtuous Bonanzas, where the soil has sublimated under sun and stars to something finer, and the wine is bottled poetry: these still lie undiscovered; chaparral conceals, thicket embowers them; the miner chips the rock and wanders farther, and the grizzly muses undisturbed.
The most profitable lodes are those which have a large supply of rock, easily to be obtained, and all of it yielding something above the cost of working. The common method of ascertaining whether rock will pay, is to pulverize a little of it and wash it in a horn spoon.
But the action was hydrothermal, just such as was seen in course of operation in New Zealand a few years ago when, in the Rotomahana district, one could actually see the growing of the marvellous White and Pink Terraces formed by the release of silica from the boiling water exuding from the hot springs, which water, so soon as the heat and pressure were removed, began to deposit its silica very rapidly; while at the Thames Gold-field, in the same country hot, silicated water continuously boiled out of the walls of some of the lodes after the quartz had been removed and re-deposited a siliceous sinter thereon.
Some were running day and night crushing quartz that was apparently rich in gold; some were running a part of the time, experimenting on a variety of quartz taken out of different lodes and prospect holes, and generally not paying, and some were idle, the owners discouraged, "bust," and trying to sell, or else gone home for the winter to get more money to work with.
If we should adopt the theory that veins of ore extend through the entire length of Mexico, then I should say that they "crop out" in Sonora, or, rather, that the silver lodes which are here above the surface dip toward the city of Mexico, and also northward toward California.
Assuming that they did exist, the task of accounting for the mode of occurrence of our auriferous quartz lodes is comparatively simple. Chloride of gold is at present day contained in sea water and in some mineral waters, and would have been likely to be more abundant during the Azoic and early Paleozoic period.
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