CEE Mme enc ee 
a 
arrangement of superficial earthy material. 355 
these veins are shown in fig. 19, which represents a common 
em in section, in the mines previously alluded to, 
in which the veins themselves and the including 
mass of decomposed rock are sluiced down and 
washed just like a placer. In fig. 20 a vertical 
section of 20 feet of a single vein of this descrip- 
tion which is a thin sheet of quartz, of an inch 
and less in thickness, yet rich enough to have 
been followed to a depth of 20 and 80 feet 
for many rods. Fig. 21 represents the floor of 
another mine at the same locality, in which 
several such thin sheet-veins are wrought in one 
cut, the vein-matter being reduced to nothing at 
se points, leaving a mere joint or fissure 
ane, 
In fig. 22 the relation of the placers to the 
topography, and of both to the governing geo- 
logical conditions, are exhibited. This diagram represents an 
ideal section southeast and northwest, transversely to the strike, 
across two of the richest and most noted gold valleys, separated 
by the Pilot, already familiar to us; these are the valleys of 
Silver Creek and Muddy Creek, 
nown as Brindletown and Bracket- 
town. The Pilot and the ridge of _ jwiilfiiAlllithh 
the South Mountains (the left in WWW (ae 
AN 
SSS 
Slopes are the long ones, while those opposite are steep and 
Short; and much the larger part of the abraded vein-bearing 
