68

representing limestone at its contact with the diorite. Similar material
outcrops at intervals to the southeast over a length of about 40 feet.
‘This zone crosses over the upper tunnel. Feast

The lower tunnel is 100 feet long and penetrates grey crystalline lime-
stone, until at 59 feet from its mouth a mineralized zone is encountered
which extends for 39 feet or almost to the end of the tunnel which ends
in a confused assemblage of granite and diorite. This mineralized zone
commences in the tunnel 10 feet farther from the tunnel mouth than the
outcrop of magnetite on the surface 60 feet vertically above it. The
major part of the mineralized zone lies in diorite. At 59 feet from the
tunnel mouth the limestone is abruptly succeeded by a mass of fairly
pure magnetite having a thickness of about 4 feet. This is succeeded
by a fine-grained, greenish dyke 6 fect thick. Beyond this for 21 feet
the tunnel penetrates a greenish dioritic rock heavily impregnated with
magnetite, much of the matter being first-class iron ore. This zone is
succeeded by a greenish dyke about 3 feet thick, beyond which is a zone
several feet wide of basic diorite heavily mineralized with sulphides, includ-
ing pyrrhotite and chalcopyrite. The remaining few feet of the tunnel
are cut in diorite. The dykes observed in the tunnel trend parallel to
the diorite-limestone contact and similar dykes are observable along the
surface with the same general trend and relative positions, thus rendering
it probable that they are a constant feature within the mineralized zone
both along the strike and in depth.

The entrance to the second tunnel is 60 feet southeast of the first
and 55 feet higher. The second tunnel is 73 feet long. It ends in diorite
penetrating, first, 45 feet of limestone, then a fine-grained, greenish dyke
for 6 feet, then 17 feet of garnetite, and finally 5 feet of dioritic rocks.
Near the face, an irregular body of magnetite carrying considerable pyrite
and having a thickness of 2 to 4 feet lies in the garnetite along the contact
of this rock with the diorite.

In the Iron Duke claim on the north slope of the valley, magnetite
outcrops on a broken hill-side rising with an average angle of 45 degrees.
A short distance down hill are exposures of granite; in the vicinity of the
ore outcrops, the rocks are dense, black, dark green and pale grey sedi-
ments and volcanics. The lowest ore outcrop occurs in a ledge close to
the west brink of a gully. At this point, in a 5-foot face, magnetite forms
two bodies, one 30 inches thick, the other 20 inches thick, and separated
from one another by 20 inches of barren rock. The ore is fairly pure
and sharply separated from the adjoining country rock. Both the ore
and country rock are much fractured and slickensided and thin films of
sulphide occur along some of these partings. At a point distant 35 feet
both horizontally and vertically from the first exposure, a rock face shows
a zone of ore 3 feet wide and traceable through a vertical distance of 15
feet. A third ore outcrop occurs 35 feet higher on the slope and 45 feet
distant, horizontally, from the second outcrop. At this place, on a ver-
tical rock wall, magnetite outcrops through a height of 15 feet with a
maximum width of 43 feet. This body is not in line with the other two
occurrences, does not seem to extend up or down hill beyond the area ex-
posed, and perhaps extends laterally into the hill, but with a true thickness
considerably less than its apparent width of 44 feet. The two lower
magnetite bodies may join one another, but whether this is so or not
can not be determined until some stripping has been done. The lowest