GOLD MINEi IN FRANC*. £88 



antimony are said tp contain 950 of silver, and. 4^)3 of 

 -old. 



4. Gold in the yellow copper pyrites of la Cochette. 



This mine is in the narrow passage of la Cochette, which m copper py- 

 forms a communication between Vaujimi in' Oisans' aricf r 

 Saint ^oilin in Mavrienne. The height of the mine, and 

 its difficulty of access, will never allow it to be worked with 

 advantage. It Appears, that it was attempted formerly, 

 arid a tradition of the fact is preserved ; but,*as is* too com- 

 mon! j the base, the narrative has a great deal of the mar- 

 vellous mixed with it. 



The pre of la Cochette yields 35 parts of refined copper, 

 and *0023fj or' gold, from 100 of black copper. 



5. Gold of Theys in a pyritous copper. 



. This mine, is in la Combe-de-Merle, below the. lake of another: 

 Seche-Dent, ou the western slope of the mountain of Theys, 

 below some mines of iron spar, and iti a forest of pines. It 

 consists of nodules of auriferous copper pyrites disseminated 

 irregularly in a vein of iron spar. 



The ore has never been accurately analysed. Yves Mi- 

 chael du Serre, in a remonstrance to the Duke of Orleans 

 published in l6ol, says, " it is so pure and clean, that four 

 parts yield three of the finest gold, and it is as plentiful as 



6. Gold of Alley ard in an argentiferous gray copper ore. 



This ore is frequently in a state of decomposition, and in trgentifer- 

 eoloured by green and blue carbonate of copper. It is ous gray C0 V~ 

 found in nodules in a vein of iron spar, at Buisson near Al- 

 leyard. 



A hundred parts of the ore furnish 60 of black copper, 

 which yield 38 of refined copper, 4 of silver, and '003159 of 

 gold. 



There is reason to suppose, that this is the mine of which 

 Hellat speaks in his Etat des mines du Royaume, when he 

 says, that Mr. de JBaral, proprietor of the iron mines of 

 Aflevard, had found a fine gold mine in that district. 



7. jGM 



