94 B, Silliman on a peculiar mode of occurrence 
offer the best solution which has suggested itself of the origin 
of the placer gold which is found in situations so far removed 
from the gold belt of the upper Sierras, and away from sour- 
ces usually recognized as those to which placer gold may be 
referred 
Experiments made by myself and by others on a considera- 
ble scale, the details of which will appear elsewhere, show that 
the amount of the precious metals disseminated in the average 
mass of vein stuff and decomposed materials of every name 
at Quail Hill, is considerably in excess of the general average 
tenor of gold veins in California. The mean of my own trials 
gave to the ton of 2,000 Ibs. by assay : 
Es BRIE RE ag ie eR Re arp 8G $35.14 
2, SAPS ee egy ar oe 15.08 
$50.22 
While from the working of carefully prepared averages in 
considerable quantity by milling process, the tenor of the 
precious metals was: : 
2 AS 2.9 C2. 0 2 C6 22h CO 0X6, Ob -6-6.5 0 DEO © 2 Oe 
fest $35.09 
The extreme friable condition of the entire yield of these 
auriferous materials renders their extraction and treatment 
eee 
Cy ae mes 
