Buoys in the parish of Endellyon. All these working are now given up.[1]
Manganese has only lately been worked in Cornwall, and it appears to afford considerable profit to the proprietors of those mines. The ore is shipped direct for Lancashire, where for some years it has been employed in the bleaching of cotton. I was informed of two mines of this metal, the one near the Indian Queen, on the road from Bodmin to Truro, the other at St. Mary Magdalene, a mile to the south of Launceston; both are consequently situated in the grauwacke formation. It is the pink siliciferous oxide of manganese, which is worked at St. Mary Magdalene, the same variety that is found in the mines of Nagyag in Transilvania. I have already given a detailed account of the mine of brown oxide of manganese at Upton Pyne in Devonshire, accompanied with ferriferous carbonate of lime, &c. Dr. Maton, at the time of his last visit to Exeter, was informed that the working of this last mine was abandoned, and that others had been opened at Newton St. Cyres, four miles N.W. of Exeter.[2]
Manganese usually accompanies iron stone mines.[3] The soil at Upton Pyne evidently contains a considerable quantity of iron in the state of red oxide; but whether it is found in the situations just
- ↑ There exists a small deposit of grey antinony accompanied with quarts, in the circle of Freyberg ; it is considered as subordinate to an older deposit of antimoniated sulphuret of silver. Nouvelle Théorie de la formation des filons, p. 303.
According to Bergman, antimony is found in kidney-shaped masses, and in threads, in veins of galena and hematites. It is also found native at Carlsen, and in the mines of Sala. Journal des Mines, No. xvi. p. 34.
- ↑ Observations on the Western Counties, vol. II. p. 74.
- ↑ Penzilly in Breage parish affords hematite of a liver brown colour, mined will Manganese. This fossil is found in a vein of yellow friable iron ore, through which it runs in veins of different thickness and position. Klaproth's Miner. Obser. p. 31.
