B. Silliman on the Mining Districts of Arizona. 308 
U. S, Assay Orrice, New York, Feb., 1866. 
Sample of ore from Arizona Territory. 
Weight of sample 34 lbs. 144 oz. Bullion obtained $59°04. 
By assay the bullion contained in 1000 parts, 
Gold, - 5 682 
Silver, - < . . é «> $08 
Copper, - - : . . 010 
1000 
The value per ton by assay is $3,572.00 
w. After treating the ore by panning to remove the coarser portions of 
the free gold, the remainder was subjected to a series of experiments to 
test the comparative value of amalgamation by ordinary mercury and 
the Wurtz process with sodium amalgam. 
First the tailings of @ were assayed and gave, 
Gold per ton, - - $1072.00 
Silver “ . Fs 60.00 
$1132.00 
5. 8 Ibs. of the ore (tailings) were amalgamated with ordinary mer- 
Fare and the bullion obtained weighed 2 dwt. 14 grs, which assayed as 
olloWs : 
Gold, - - - - - 706°5 
Silver, - - . - - 291 ‘0 
Copper, - - - - - 25 
1000 
Value of Gold obtained from 5: $1.88=245 pr. ct. of fire assay. 
ilver $ x 04 
$1.92 
¢. 8 lbs. ore (tailings) were treated with sodium amalgam, (Wurtz 
Process) and the button obtained weighed 4 dwt. 114 grs., which gave 
by assay 
Gold, - - - + - 705 
Silver, - . + * - - 146 
Copper, : . . : : __ A 
1000 
Value of Gold obtained from ¢: $3.26=78 pr. ct. of fire assay. 
“Silver alia aad 04 
The total quantity of gold in 8 Ibs, of ore by fire assay is $4-19. 
Jxo. Torrey & Soy, 
The assays of samples of the ore of this vein collected by 
myself and others, show a value of from $70 or $80 to several 
thousand dollars to the ton of 2000 lbs. But all such results 
