-121-

places granitic intrusives cut volcanics and that certain areas

are favourable for prospecting.

Bob Creek and Buck River

The Bob Creek and Buck River section has attracted much .
attention because of hopes to develop a large low-grade gold mine.
A great number of attempts culminated in 1934 with the starting of
& small mill, which after some short, unsatisfactory runs was
closed. Placer gold deposits, already described, which have
afforded a small yield, have also contributed to the interest
aroused by this section. Unlike most other mineralized sections
it is not mountainous but is located in the main on,a small hill.

The nature of the main deposit and the conclusions
reached by the writer may be briefly summarized as follows: Bob
Creek canyon affords a section 1,500 feet long and as much as
150 feet deep across a very large, very low-grade mineral ‘
deposit. Other exposures indicate a length in excess of 1 mile
and widths at least comparable with the canyon section.
Mineralization occurs around and in a core of porphyry which is
so badly altered as to be largely unidentifiable in the midst of
similarly altered volcanics. All this altered rock is impregnated
with pyrite and carries very low or no values. Scattered
irregularly throughout are stringers carrying gold, in part free,
up to 1.4 ounces a ton (average for four assays 0.6 ounce a ton),
silver to 24 ounces a ton(average 10 ounces a ton), considerable
zine (one assay returned 18 per cent), and a little lead. These
represent even in the best ground less than 5 per cent of the
total rock. The grade of ore, therefore, as reported to be
confirmed by extensive assaying is vory low, probably averaging
less than 0.05 ounce a ton in gold. The deposit as a whole or in
sections is not yet indicated to have prospective economic value.

Since in the canyon section the mineralized zone occurs in and