536 PHILOSOPHICAL TRAKSACTIONS. [ANNO IGQS. 



Abstracts of two Letters from Mr. David Davies, concerning several Copper ' 

 Mines ; in answer to some Queriet proposed by Dr. Lister, S. R. S. N° 200, 

 p. 737. 



The thickness of the vein of copper-ore at Gouldscope, in Newlands, was 6 

 feet. 



The 1st work, that was found and wrought in by the Dutchmen in Coniston- 

 fells, is called low-work. It has a stulin or shaft, to draw water from the 

 mine. When they ceased working, it was left good, and had been wrought 

 from the day to the evening-end of the said work 40 fathoms, or thereabouts ; 

 the seam or vein of copper-ore then was left above three quarters of a yard 

 thick of good ore, which seam or vein went from the evening-end to the morn- 

 ing-end of the said work, and was esteemed an extent of 200 fathoms wrought 

 as the vein went ; and was, when left, all near of a breadth or thickness. The 

 copper ore in this work was mixed with some silver, or lead-ore. The 2d work 

 is called white-work or new-work, about 40 fathoms from the first ; which was 

 found a little before the works were given over, being wrought about 10 

 fathoms deep ; the seam then left was about 22 inches of good copper ore. 

 The 3d work is called Toung Brow, a little distant from the last, being wrought 

 about 30 fathoms, and the seam about 2 feet thick of like ore. The 4th work 

 is called God's Blessing, or Thurdle-Head, being wrought about 20 fathoms, 

 and is about a mile from the last mine ; the thickness of the seam of ore above 

 a yard, when left off; and thought by the workmen much of it to be gold-ore 

 it having been highly prized by their masters at Keswick. The 5th work is 

 called Hen-Cragg, a mile from the last, wrought about 2 fathoms ; a small 

 seam, but excellent ore, and expected to prove a large seam. The 6th work is 

 called Sumy-work at Lever's Water, at the water-side; a little above that, 

 Hanch Clocker's-work ; a little above that George Towers and William Dixon's 

 work, Bartle Clocker's work ; near the last Richard Towers's work, then John 

 Sackloc's work and Hanch Mire's work, being all 7 works, and lie all together, 

 and about a mile from the 6th work abovesaid, and wrought about 10 or 12 

 fathoms, the seam of ore about 16 inches thick, the stone very soft, the ore 

 very rich, and much of the said ore green, and was very much prized by the 

 head masters at Keswick. The 7th work is called Gray-Cragg-beck, found by 

 William Dixon ; wrought but a little, the seam about 18 inches thick, of as 

 good ore as any of the other works, and very hopeful to have a good seam. 

 The 8th work is called John Dixon's work, in Brumfell, then newly found, and 

 wrought about 2 fathoms, the seam about 24 inches thick, and esteemed the 



