284 A TOUR ROUND NORTH WALES. 



five wide, and two feet deep, to be wafhed, 

 and made merchantable. The poorer! of 

 this, that is, fuch as contains from i f to 

 2 per cent, of metal, is then conveyed to 

 the fmelting houfes at Amlwchr-Port ; the 

 reft is fent to the company's furnaces at 

 Swanfea and Stanley, near Liverpool. By 

 the proceffes of roafting and warning, though 

 the ore is much reduced in quantity, it is 

 confiderably improved in quality; and the 

 water is fo richly impregnated with cop- 

 per, which is djflblved by the acid quality 

 of the fulphur, that by means of old iron 

 immerfed in it, according to the German 

 method, it produces fuch great quantities 

 of fine copper, that the proprietors have 

 obtained in one year upwards of a hundred 

 tons of the copper precipitated from the 

 water. Were tru's water afterwards eva- 

 porated, it would yield green vitriol at 

 nearly the rate of two hundred tons of vi- 

 triol for each hundred tons of iron, which, 



at 



