of the -placer-gold and in its redeposition at progressively
lower elevations as the creek deepened its channel. Rock
benches might be left by any swinging of the creek from side
to side and placer-gold might be deposited on them. The rock
bench to, the east of Barrington's camp and 25 to 30 feet above
it may be one of these. The early glaciation apparently did
not disperse its gold.

Qn the Peacock lease a bed-rock channel, separate from
the late Tertiary one, was cut during the interglacial stage
(see Fig. 5). In it, gold is on top of flat-lying, thinly-
bedded clay in the bottom of the channel. The gold is be-
lieved to be reconcentrated from a higher, Tertiary gold con-
centration left on the rock bench lying to the east. An un-
sorted clayey gravel was deposited above the clay prior to
the readvance of the ice. Although gold is disseminated
through the gravel, most of it is close to the clay at the
bottom. Because there was little or no stream sorting, the
gold is not in a well-defined pay-streak, its only confining
limits being the sides of the channel. A further irregular-
ity may have been introduced by the erratic distribution of
earlier gold accumulations left more or less untouched by the
early ice advance. The gold being mined in the channel on
the Peacock lease was deposited in the interglacial stage and
is a reconcentration of pre-glacial gold accumulations. The
last ice advance was again not sufficiently erosive in the
bottom of the valley to disperse the interglacial gold con-
centrations. :

Wheaton Creek re-occupied its valley after the disap-
pearance of the ice and re-excavated its channel almost down
to the late Tertiary and interglacial levels. In so doine,
it cut a post-glacial canyon on the upper part of the Elvira
lease (No. 402) and concentrated, on bed-rock, gold that for-
merly had been in any glacial debris and in the bottom of the
deepest of the late Tertiary channels. Gold on lease No
302 was reconcentrated by the present creek and rests on bed-
rock. below. creek-level.

On the Peacock lease, post-glacial down-cutting of the
creek reconcentrated, in surface gravel the gold dispersed
through glacial debris and gold that may have been left on or
along the edge of the rock bench to the east of Barrington's
camp.

Two factors may account for the gold values on lease
No. 402 being much lower than those on the Peacock lease.
First, the auriferous interglacial channel mined on the Pea-
cock lease is believed to exist as a buried channel lying to

7