128 The Hart z. 



Result of an extremely rich essay made in 1829. The great 



richness of the ores worked at Andreasberg, had long since given rise 



to a like idea, which was as often rejected. The richness of the 



mixture might occasion a loss of precious metal by volatilization, as 



also by the scoria, and the mattes. The essay was performed, the 



schlich was smelted without die formation of mattes and without 



much loss. The mixture contained about 80 marks of silver per 



quintal. The ores employed in this melting were the red silver, and 



antimonial silver; the argentiferous galena was considered too poor for 

 treatment. 



The fusion was made in any ordinary high furnace and the mixture 

 composed as follows. 



Marks. Loths of silver. 



14 quintals 78 lbs. of schlich containing 1181 1 J 



7 " 26 " " another schlich, " 366 12 



24 " of mattes of a common operation, " 4 2| 



220 " " litharge, containing 1 I If 



48 " " scoria of a 2d matte, 3 



100 " " scoria of a 2d matte (diff. opera.) 6| 



12 ■ "Iron, 



Quantity of silver contained in the bed, 1554 5 



The products of this fusion were 

 180 quintals of rich lead, 



9 



2 " mattes, (a small quantity comparatively speaking.) 



262 « 



scoria, 



[ 



50 " Ofenback, (or bricks containing metal from the fur- 



A small quantity of an alloy resembling cast iron, probably a mixture 

 of antimony and arseniuret of iron, weighing twenty seven pounds, 

 containing from two to three loths of silver. 



The consumption of this fusion was [tnaars. 



100 maars of charcoal, costing 3 tlialers 8 bons groshen the 10 



10 postes of 12 hours at 11 bons groshens the poste. 



10 postes at 7 bons groshens, 



30 hands at 4 to 5^ 

 The 1 80 quintals of lead were cupelled at two difFerent operations 

 producing 1284 marks 10 J loths of refined silver. 



90 quintals of litharge, 

 7 6" " cupel bottoms, 



41 " abstrichs, 



20 " rich litharge. 



