23d. At the place you quit the road of Glan to enter into 

 the mountain, and near the lake, there are traces of diflferent 

 trials, but all now abandoned. Some are on veins of lead, 

 others on pyrites, their fituation being altogether in the plain. 

 The impoflibility of bringing up levels to them, has, no doubt, 

 occafioned them to be abandoned. We mention them here only 

 to fhew how abundant in mines this territory is. 



24th. The firft trial we propofe to examine is that called 

 Ambrofe's Shaft. It is fituate about two hundred feet above the 

 lake in a very fteep place. The vein at this work is almoft 

 perpendicular to the horizon. The diredion is oblique to the 

 mountain, fo that fuppofing it regular and continued, it would 

 extend in a diagonal line from the top of the mountain to the 

 lake. It is about two inches thick. Near Ambrofe's Shaft it 

 forms a folid bed of quartz, fo detached from the mountain as 

 to make one prefume it is fo throughout the entire of its courfe. 

 The copper ore is found to be contained in the quartz, and mixed 

 with a great quantity of fulphur. The trial in that place has 

 been abandoned on account of the fcarcity of the ore, and the 

 hardnefs of the vein. 



25th. We confider that the only way to work to advantage on 

 this vein would be to open a gallery at the lowermoft part of 

 the mountain in the very vein itfelf, which according to its 



apparent 



