v(> 



country for copper, great quantities of which 

 they exported, and extracted the gold from it. 

 It.e proportions of these metals are very various^ 

 there are some copper ores which contain a tenths 

 and others a third part of 2:okl : but in these 

 cases both substances are found in a metallic 

 state^ without having been mineralized. 



The copper ores, containing but little or rg 

 gold, are usually mineralized with arsenic or 

 suiphur, sometimes with both, and mixed with 

 iron and silver. Thev are found under the 

 forms of vitreous and hepatic ore, of ultra- 

 marine stone, and of malachite and white copper 

 ore. These several ores are rich in metal, but, 

 from the expense of refining them, they are 

 considered as of no value. The ores that are 

 wrought are but two kinds, the grey or bell 

 metal, and the malleable copper. The grey ore, 

 or bell metal, is usually mineralized with arsenic 

 and sulphur ; it contains no c;old or other metal, 

 except a small porfion of tin.--- From this mix- 

 ture and its grey colour, whicli it retains even 

 after having hi^zn incited and refined, it may be 

 considered us a species of native bronze; it 

 has another characteristic of that factitious 

 metal in its britllcnes-, altliough its specific gra- 



If the author has ivcn an arcuro.te description of this 

 metal, it ii of a very sir^rular spcdrs, and notJang similar to 

 it has Ice'i discovered in Oie viina of Enrobe. ^,X\> 'VxaW'^. 



