Page:Transactions of the Geological Society, 1st series, vol. 2.djvu/165

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Mr. William Phillips on the Veins of Cornwall.

that in some part of Dunkin's vein, granite was found on one side of it and schist on the other, and that detached masses of each substance were found both in it and in the South vein; and frequently, that where granite formed the country on each side of the vein, the masses were of schist, and vice versa.

Description of some of the Veins in the Mines called Tol Carn, Huel Jewel, and Huel Damsel, near St. Die.

Transactions of the Geological Society, 1st series, vol. 2 fig. page 0587 fig. 1.png

The veins of these mines are remarkable in several respects. A small brook was the boundary between Huel Jewel, which had been worked about fifty years at an immense profit, and that of an untried mine called Tol Carn, near St. Die. The veins of Huel Jewel were very rich in those parts which adjoined Tol Carn mine. This, of course, raised the expectation of the adventurers in the latter to an extraordinary pitch, and they set to work in the full belief that they should be at little trouble and expense in realizing on their side the brook, a continuation of the riches on the other side, as the veins of Huel Jewel made immediately for Tol Carn mine. On sinking a shaft in order to cut one of them at a certain depth, they were surprised at not doing so, since from knowing the precise run of the vein, the miner is generally able to make nice calculations in point of depth and distance in the sinking a shaft. After this had been done, as far as it was deemed proper, they drove through the country, at right angles with the shaft, from north to south, several fathoms without finding the vein. It was then attempted, by sinking shafts, to cut the other two veins which formed a part of the workings of Huel Jewel, but without