184 United States’ Gold Mine. 
Other metals.—The sulphuret of iron and of copper, (pyrites,) 
the sulphuret of zinc, (blende,) the argentiferous sulphuret of lead, 
(galena)—disseminated, more or less, in the quartz. Probably these 
sulpburets may be auriferous, as that of iron has been found to be, 
* Quartz vein.—In clay, opened lately :—the vein is about one foot 
wide and stands up in the clay like a wall; the decay of the slaty 
rock has probably formed the clay, while ne — being a firmer 
material, has better withstood the action of tim 
Crushing or stamping.—The quartz, with i contained gold, is 
broken down by vertical stampers moved by steam ; or it is crushed 
by huge iron—shod wheels of wood (Chilian mills) moved by water 
power. 
The amalgamation.—The mercury and the crushed quartz are 
agitated together ia Tyrolese or Hungarian bowls, and the amalgam 
being decomposed by distillation, the gold is thus obtained and the 
mercury recovered. 
Yield of gold.—In general about one pennyweight of gold to one 
bushel (100 pounds) of the quartz; the quartz that is in place in the 
rock may not contain quite so much, while that in the quartz 
standing in the clay affords fully that amount, or more; that is to say, 
one dollar to the one hundred pounds of quartz. , 
Product for time.—The greatest yield of this mine is about six 
hundred dollars per week—the general yield is less. 
Pits, tunnels, and adits.—Several. One adit at the depth of forty 
feet is carried into the side of a hill—one tunnel at the depth of 
eighty feet—the adit being under the tunnel. Extent of ground 
four hundred and fifty acres—cost, $150,000, or $333 33 per acre. 
Expenditures.—In all $18,000—with an income of $12,000, in- 
cluding land and all: the cost of working is $40 per day. 
Number of hands.—Forty to fifty, including ten Cornish miners. 
Time of beginning operations.—In 1835 
A communication direct from the President of the United States’ 
Gold Mining Company through Mr. F. Shepherd, informs us, that 
contemplated operations at this mine are soon to be on a much larger 
scale ; and that already the working force has been trebled for the 
year 1837. ‘ 
* Too Jate for the present No. we have received a description of the auriferous 
quartz veins of this mine ; it will appear in the next number. 
