1852.] Second Notice on the Argentiferous Ores of Deoghur. 75 



Our zealous contributor Capt. Sherwill having sent me a box of the 

 ores from which I obtained 14 ibs. weight of them, I have worked 

 the whole quantity at once ; and as all these new operations and results 

 are of interest, I describe the ores and the variation of the process 

 which was not exactly the same as before. 



A. 9 ibs. Adv. weight of a dark dull liver-coloured and earthy 

 green ore, a mixture of carbonates and sulphurets of copper and 

 oxide of iron, with a few specks of yellow sulphuret like a very dull 

 peacock ore. Its external coat is of a bright Colorados red. 



B. 5 ibs. Adv. weight of the same ore, clouded and mottled with 

 red and green earthy masses, as if in process of being converted into a 

 Colorado ; the external coat also the same as A. 



Both kinds of the ore contain a little Bismuth. 



These 14 ibs. weight of ore were very gently roasted to form the 

 magistral from the sulphuret of copper of the ore, which is one varie- 

 ty of the Mexican modes of treating this class of them ; and the 

 colour of the pulverised ore changed in this operation from a greenish 

 to a reddish brown. The salt and mercury were added as before, so 

 as to insure the extraction of the whole of the silver ; and both kinds 

 when washed off were found to give so nearly the same proportional 

 produce that the whole may be taken as one lot. The separation of 

 the whole of the silver was found to be complete, as none could be 

 detected in the residuum from the washings. 



The 14 ifcs. of ore produced 154 grains of pure silver (165 grains, 

 or the produce of 15 lbs of the ore would be required for the weight 

 of pure silver in a rupee), and this I have had manufactured into a 

 medal with the following inscription on each side of it. 



JAMES ANDREW, 1852 - 



Marquis of Dalhousie 



BENGAL SILVER 



Governor-General of India From deoghur 



1852 180' N. W. of Calcutta. 

 Amalgamated 



H. P. CUEATOR. Fr ° m 0re ° f 15 i MarCS - 



or 



Fstf' 



154 grains of silver from 14 lbs Avoirdupois weight of ore is 11 

 grains to a pound weight ; this would be called by a Mexican Miner, 



L 2 



