286 A TOUR ROUND NORTH WALES. 



iron becomes diflblved by the acid, and is 

 fufpended in the water whilft the copper is 

 precipitated j care is taken to turn the iron 

 every day in order to fhake off the incruf- 

 tation of copper formed upon it, and this is 

 continued till the iron is perfectly dhTolved. 

 The workmen then drain off the water, 

 and rake together the ore in the form of 

 mud, which, when it is become, by dry- 

 ing, of the confiflency of a foftifh pafte, 

 they bake in ovens conftrudted for the pur- 

 pofe, and export it, with the other ore, to 

 Liverpool or Swanfea. One ton of iron 

 immerfed in this manner, produces near 



two tons of copper mud, each of which, 



i 



when melted, will produce fixteen hundred 



A 

 weight of copper -, this fells at a confide- 



rably higher price than the copper which 

 is fluxed from the ore. 



This method of obtaining copper by 

 means of iron, has been long pra&ifed in 

 Germany, but has only been known amongft 



us 



