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Updated: August 24, 2024
Several lodes, said to be rich in gold, had recently been discovered, and a nice stream of water ran down the gulch. Only three mills were in operation there, and a number of miners who were developing their own claims strongly encouraged us to come, promising us plenty of quartz to crush.
B. D. Plummer, who has had ten years' experience of mines at Kolar, and worked the Mysore and Nundydroog mines, that the old native workings went down to a depth of about 260 feet. These, which were all choked up, were followed down to the bottom, and valuable lodes were found at about 150 to 260 feet.
But in Cornwall, some lodes occur where the vertical plates, or COMBS, as they are there called, exhibit crystals so dovetailed as to prove that the same fissure has been often enlarged. The breadth of each represents the whole width of the fissure at six successive periods, and the outer walls of the vein, where the first narrow rent was formed, consisted of the granitic surfaces 1 and 7.
There can be no doubt that there are many rich lodes in existence worked by Indians, who, knowing that they will be compelled to labour for the benefit of their masters, carefully conceal them.
From this we may fairly reason that at these points the slow stream filling the lode cavity met with a reagent percolating from this particular band of rock, which caused the deposition of its metals; and, indeed, I am strongly disposed to believe that the deposition of metals, particularly in some loose lodes, may even now be proceeding.
The divining-rod has long been in repute among Cornish miners, and Pryce, in his "Mineralogia Cornubiensis," says that many mines have been discovered by this means; but, after giving a minute account of cutting, tying, and using it, he rejects it, because, "Cornwall is so plentifully stored with tin and copper lodes, that some accident every week discovers to us a fresh vein."
On its way down, it struck a brown rock and broke a portion of it off exposing a vein of white quartz which proved to be auriferous, induced the disappointed miners to remain some months longer in the state, and paid them well for remaining. Science and experience do not appear to give much assistance in prospecting for quartz lodes.
A few fragments also of tin found in Wicklow in the drift are supposed to have been derived from veins of the same age. Next, if we turn to Cornwall, we find there also the monuments of a very analogous sequence of events. Here, then, the tin lodes are newer than the elvans.
Rich as are the lodes which lie beneath the water, the mining engineer is compelled to confess that the metal value which they contain would not leave, after extraction, a sufficient margin to pay for the enormous cost of draining the shafts.
Since the lodes were first filled they have been subjected to every variety of hydro-thermal and aqueous influence; for the cooling of the heated rocks must have been a slow process, and undoubtedly the veins have often been the channels both for the passage of hot water and steam from the interior, and of cold water charged with carbonic acid and carbonate of lime from the surface, and many changes must have taken place.
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