The celebrated Clay Works in the parish of St. Stephen’s are also well deserving of attention; as they are now conducted upon a very extensive scale. In a commercial point of view, the discovery of this clay, or china stone, has been attended with the greatest advantages, besides being the means of affording employment to many men, women, and children. The value of this clay, or china stone, as it is generally called, was accidentally discovered about 60 years ago; since which time, immense quantities have been exported for the porcelain manufactories in Staffordshire and Wales. It is a decomposed granite, the felspar of which has lost its properties of fusibility; but, in the manufacture of china and earthenware, it is of the greatest value. In the manufacture of crucibles at Truro, it has been found of much value. Notwithstanding, however, the great success which has attended the progress of the china stone works, it is to be lamented, the wages allowed to the several persons employed in them, are so trifling. Little occurs to interest the traveller in regard to mines, after leaving St. Austell, until his arrival at Truro.

The Carnon Stream Works, on the left of the road leading to Falmouth, are the most considerable in the county, and merit particular observation. It is now nearly 40 years since they were first discovered; and the quantity of tin which they have yielded, has proved a golden harvest to the proprietors of them. The works occupy a considerable extent of ground, and appear to have been gained from the sea; the mud and other matter washed down by the stream, having raised a sort of embankment, which, by its continual extension, and some assistance from art, has gradually contracted the boundaries of the tide.[[50]] The bed of pebbles from which the tin is extracted, is about 30 feet below the surface of the ground, and from four to six feet thick. As a proof that these works must have been known in very early times, a wooden shovel, and picks made of deers’ horns, together with some human bones and skulls, have been found at different periods. Great improvements have been lately made in the works for drawing off the water, and which has also, from the lowness of their situation, been attended with considerable benefit to several other mines in the neighbourhood.

When at Helston, the traveller will derive much gratification from visiting the celebrated Tin Mine, called Huel Vor, which is situated about three miles west of that town. This mine is allowed to be one of the most valuable in the county; and its proprietors are said to have gained a clear profit of upwards of £10,000, in the short space of three months, notwithstanding the monthly charges amount to £5,000. Here are no less than five large steam engines for drawing off the water, besides several others of less magnitude for raising the ore, &c. There are also four large stamping mills worked by steam. The operations of this mine extend more than a mile and a quarter below the surface of the earth, and about 1300 persons are employed in conducting the different works. The ore is smelted and roasted on the spot; and when properly cleansed, is ladled from the furnaces into moulds of 370lbs. each. The principal lode in this mine is said to be of the enormous width of 30 feet, and extremely rich. The expenses incident to carrying on the working of this mine are very great; especially in the consumption of candles and gunpowder, which far exceeds any estimate a stranger to mining concerns could form. In this mine, no less than 3,000lbs. of candles, and about 3,500lbs. of gunpowder are consumed every month.

The Botallack Tin and Copper Mine, in the parish of St. Just, near the Land’s End, is one of the most surprising undertakings in the county, as the operations of the miners extend for nearly 70 fathoms under the bed of the sea; and the entrance to the works is at least 200 feet below the cliffs.

——“How fearful

And dizzy ’tis to cast one’s eyes so low,

The crows and choughs that wing the midway air

Show scarce so gross as beetles:——

——I’ll look no more,

Lest my brain turn, and the deficient sight