A. W. Chase—Gravel Deposit of Gold Bluffs. 383 
eury is applied. Sodium is also used to free the quicksilver 
rom impurities. A ton of the tailings, analyzed in San Fran- 
cisco after this improvement had been effected, did not afford a 
trace of gold. The copper-plates in use, especially in the old 
process, become quite valuable after continuous service, the 
copper being replaced by an almost pure amalgam of gold and 
er. 
quicksily 
black sand has been said to have been brought up from the 
by €Xamination of the specimens, this gold 
acter that when dry it will float on the surface of water. | 
n endeavoring to account for the presence ot these remark- 
able gravel banks, unique I believe on the Pacifie coast, one 
