112 Chronicles of Science. [Jan., 



continues its value, above 200/. per fathom ; and the 174 West has 

 very much improved, being now worth about 50/. per fathom. The 

 184 (bottom level) is worth nearly 200/. per fathom. The 147 East 

 of Ivey's, and the 147 West of Metal Shaft, are both very productive ; 

 and as these ends are within a few fathoms of each other, the im- 

 portant fact may be considered as established — that there is one 

 continuous and rich body of ore from Ivey to Metal Shaft."* Such is 

 the technical report of the managing agent. The known reserves in 

 this mine have been estimated by a competent authority to be worth at 

 least 200,000/. 



The Copper Mines of Cornwall are regularly falling off in their 

 production of ores. Indeed, nearly all the existing mines are giving 

 indications of exhaustion. There are a few exceptional cases, for 

 example, the production of the following mines which yielded yellow 

 copper ore, as recorded in 1863, will be equally good in 1864 : — 



Tons, £ 



Devon Great Consols 26,694 value 128,576 



Clifford Amalgamated .... 14,382 „ 69,157 



West Huel Seton 6,362 „ 33,456 



East Caradon 6,030 „ 34,155 



South Caradon 5,837 „ 52,087 



West Basset 5,387 „ 31,204 



Amongst the most remarkable of mining speculations which are 

 at present engaging attention, notwithstanding the depression referred 

 to, is the reopening of a very old and once celebrated Copper Mine, 

 not far from Camborne, known as Crenver Huel Abraham. It is 

 stated — and the statement may be relied on — that a contract has been 

 taken to place this abandoned mine in working condition ; that is, to 

 clean up and open all shafts and levels, to erect machinery for 

 pumping and winding, and to drain the mine, for 80,000/. In a 

 district known as the Chiverton district, not far from Truro, upon the 

 promise of one fortunate discovery, West Chiverton, which mine pro- 

 duced in 1863, 1,182 tons of lead ore, which gave also 27,269 ounces 

 of silver, no less than fifteen mines have been started, each one in- 

 volving an outlay of many thousands of pounds. Everyone who 

 looks dispassionately at the present state of Metalliferous Mining, 

 cannot fail to observe a most unhealthy action, which, it is to be 

 feared, will only be remedied by the ruin of many of the ill-advised 

 adventurers. 



Twenty years since, Mr. Arthur Dean made known the existence 

 of gold in the Quartz Eocks of Merionethshire. This gentleman has 

 lately been appointed Consulting Engineer of the Vigra and Clogau 

 and Welsh Mining Companies, and he has published a statement of 

 some interest as to the production of Gold in North Wales. He 

 writes — 



" The mining territory belonging to the company is large, and the 

 collective lengths of the principal lodes exceed 4^ miles. 



" Some of these have, in former times, been extensively wrought 



* ' Mining Journal.' 



