Page:Transactions of the Geological Society, 1st series, vol. 4.djvu/163

 commencement of the work at the north end, should be one of that description. It is called Wheal Crebor lode, and has already been worked about 60 fathoms deep under the level of the tunnel, and has produced between 8 and 9000 tons of copper ore; its direction is as usual from north-east to south-west, and it has been traced to be the same vein that is worked at Wheal Crowndale mine to the east, in killas; and at Gunnis Lake mine to the west in granite; at both of which concerns very large quantities of ore have been raised. The lode at Wheal Crebor is in some places fourteen feet wide, though in others not as many inches. It is traversed by cross veins which heave the lode, as the miners call it, a few feet.

The mine is now producing near 4000 tons of ore in the year: a specimen will be found with the others.

The next lode found in following the course of the tunnel southwards contained tin, but not in any great quantity, and very little work has been done upon it in the way of trial in consequence.

Further south is a lode called Wheal Georgiana, which has produced some rich copper ore in the porphyry, where the tunnel discovered it. It has been pursued into the killas, but in this rock it appears to be less productive of metal.

At the present end of this part of the work which is approaching the centre of the hill, a vein has just been met with holding copper, but too little is yet known of it to afford any description.

In the space yet unopened between Bray's shaft and the end approaching it from the south, is a lode called Holming Bram, which was formerly worked for tin, and on which considerable expectation is grounded. Having simply stated the facts as far as my knowledge of them goes, I abstain from speculating on the