Dolcoath, the profoundest mine in Cornwall, which
had for some time been worked for copper, became
next rich in tin. What seems to have been the
case was this: when a vent offered, there was a
scramble between the two minerals which should
get through first and out of the confinement under
earth's crust, and now a little tin got ahead; then
came copper trampling on its heels, but was itself
tripped up by more tin.
Now, when the granite came to the surface, it did not have everything its own way, and hold its nose on high, and lord it over every other rock as being the most ancient of all, though not the earliest to put in an appearance. There was a considerable amount of water about. There is plenty and to spare in the west of England now, but we may feel grateful that we do not exist in such detestable weather, nor exposed to such sousing rains, nor have to stand against such deluges, as those which granite had to encounter. Hot, over-hot, it may have been below, but it was cold and horribly wet above.
The rains descended; the floods came, and beat on the granite, which, being perhaps at the time warm and soft, and being always very absorbent, began to dissolve.
As it dissolved, the water swept away all its component parts, and deposited the heaviest near at hand, and took the lightest far away. Now the heaviest of all were the ore from the veins or lodes, and the water swept this down into the valleys and left it there, but it carried off the dissolved
