105

having a length of at least 700 feet and a maximum width of not less than
50, and perhaps as much as 100, feet, since only one edge of the zone or zones
is now visible, the southwestern edge being concealed under drift and the
nearest outcrops of unmineralized rock lying a little distance away.

At each of the three mineralized outcrops, the material is of the same
‘general character and has a streaked or imperfectly banded appearance.
The individual, ill-defined layers seem to strike along the course thought
to be followed by the mineralized zones and appear to be nearly vertical.
In several places the mineralized rock grades outwardly into unmineralized
country rock. The main mass in every case consists of micaceous hematite
intermixed with a fine-grained gangue presumably representing much-
altered country rock. The proportions of hematite and gangue material
vary from band to band. The individual bands or streaks fade laterally
into one another, are ill-defined, and are not continuous along the strike,
but after continuing a few feet die away and are replaced by others of
different characters. In places, individual streaks having widths of as
much as several feet, but more often of only a few inches, are composed
nearly wholly of hematite, but such streaks are exceptional and the rest
of the material of the zones carries too little hematite to be of value.

The country rock seen on the lower slopes of Tipella mountain and
up to the vicinity of the mineral claims is a normal granite, but on the
southeast slopes of Crazy Creek valley within the area of the mineral
locations, a band of schistose rocks is present and it may be that the
hematite occurrences lie near a contact of granite with a large mass of
older rocks, but there is no direct evidence of this being the case on the
northwest slopes of Crazy Creek valley where the main showings of hema-
tite are and where large exposures all of granite are visible. It is possible
that the hematite has developed in patches of older rocks included in
granite, but the material is now so much changed that it does not seem
possible to determine whether the hematite has formed in isolated patches
of foreign rock included in the granite, or whether, as seems probable,
it has merely developed locally within the granite. The mineralized
material has been produced by agents replacing and impregnating once
barren rock. There is no reason for supposing that the mineralized matter
materially changes in character at any moderate depth below the present
surface.

The few limited outcrops unmistakably indicate that the mineralized
zones as a whole do not consist of ore, but of rock impregnated in varying
degrees with hematite. In places the hematite is sufficiently concentrated
to constitute ore. This ore does not form continuous layers, but instead
forms discontinuous streaks of no great length and so far as seen never
wider than 3 or 4 feet. It is possible that in places these masses of ore
may be of considerable thickness. It is stated that at one place ore shows
through a thickness of 18 feet, but this particular occurrence could not
be rediscovered. But supposing that in places ore does occur with widths
of 18 feet or even more, there is every reason to suppose from what is
now visible that the individual masses of ore would be lens-like, of no
great length, and probably of no great depth. In all probability the ton-
nage content of any one lens-like mass would not be above 10,000 to 20,000
tons and it is probable that these larger bodies, if any exist, would be
distributed so erratically within the mineralized area that mining would
be unprofitable.