SiLVEK Ores. 443 



or amalgam, occurs chiefly in the oolitic and porpliyritic 

 series near intrusive diorite. 



The following picked specimens from Ancachs show the 

 maximum yield of a variety of ores : native silver with ar- 

 senuret of silver, panabasite pyrites and blende, 4284 marks 

 to the cajon ; argentiferous tetrahedrite with pyrargyrite, 

 free from gaugue, 1966 mai-ks; argentiferous tetrahedrite, 

 malachite, and azurite, 300 marks; sulphide of antimony, 

 silver, lead, copper, iron, and manganese, 606 marks ; an- 

 timonial lead, copper, and silver, with chrysocolla, 524 

 marks; cerusite witk antimonial silver, lead, copper, and 

 iron, 756 marks; antimonial silver, lead, and iron, with 

 sulphide of silver and antimony, 680 marks ; argentifer- 

 ous tetrahedrite with galena and blende, 676 marks ; mali- 

 nowskite — crude, 572 marks; pure, 1191 ; argentiferous 

 antimonial silver, 312 marks ; sulphide of silver in decom- 

 position with galena and anglesite, 712 marks ; anglesite, 

 chloride of silver, and antimonial lead and silver, 560 

 marks ; argentiferous galena and tetrahedrite, 532 marks ; 

 argentiferous jamesonite, 340 marks; antimonial silver, 

 lead, copper, and iron, with cerusite and malachite, 408 

 marks. 



