17

inches of the latter gave 20 per cent of copper; and in the main cut a sample
across 6 feet gave 6 per cent of copper (assays furnished by Mr. Clement).

From this place towards the east, open-cuts show a strong vein with
distinct walls, which varies in width from 3 to 15 feet and averages about
5 feet. Only in a few places has the oxidized portion been completely cut
through, notably near the east end.

At the Munro cut, 350 feet from the east end tunnel, the vein is 53
feet in width and shows 18 inches of solid chaleopyrite in the middle; the
rest of the vein is highly oxidized and leached. At No. 2 cut, 150 feet west
of the tunnel, the vein is 4 feet in width; there are 18 inches of high grade
ore on the hanging-wall and the remainder is of low grade ore.

The tunnel at the east end of the Delta property (Figure 4) on this
vein enters the vein at an elevation of 6,250 feet and runs for over 200 feet,
thus bringing it well under No. 2 cut, giving 115 feet of backs at this place,
for a shoot 27 feet long and 18 inches wide of high grade ore. The tunnel
develops no ore for the first 65 feet from the portal, then 7 inches of solid
sulphide appears in the vein which at this place is 3 feet in width, and is
continuous for the next 27 feet, varying from 7 to 18 inches in width and
following the hanging-wall; besides the high grade there is generally 18
inches to 2 feet of low grade ore along the foot-wall. This ore ceases
abruptly where the vein cuts through a dyke at this place for 33 feet. A
few feet from this dyke the ore was again encountered, varying from 3 to
24 inches in width in a distance of 35 feet, but of lower grade than before.
For the next 27 feet there is a band of solid ore on the hanging-wall from 12
inches to 24 inches in width, which is probably the downward extension
of the ore exposed in No. 2 cut.

At 85 feet from the portal a raise was put up in the ore, but at 15 feet
above the drift the ore stopped when the dyke was encountered. A winze
was sunk a few feet west of the raise to a depth of 30 feet, in 12 inches of
ore throughout this depth; at the bottom of the winze the ore was 12 inches
wide at the east side and 26 inches wide at the west side, all of high grade.-

Paragenesis of the Ores.
Table of Paragenesis of the Ores from the Highland Boy Veins, Delta Property.

Granodiorite.
Fissuring, with development of sericite and some chlorite, with some silicification of the
adjacent country rock.
Actinolite replacing altered country rock in places along the fissures.
Silicification and partial replacement of altered country rock and of the actinolite by
quartz,
Crushing along the same lines as before, showing especially in the more siliceous portions.
Vein replacement by metallics in the following order:
Magnetite.
Hematite. ;
Molybdenite (in small amount and position approximate).
Pyrite.
Gold (a few grains replacing magnetite and quartz came with pyrite and chalcopyrite).
Chalcopyrite, with a little tetrahedrite and bornite.
Tin mineral tHDs O) trace, paragenesis not known.
Veining and replacement by calcite.
It should be noted that none of the lead-zine minerals is present in the veins on this property,

Discussion. In general the history of the veins on the Delta property
has been similar to that of the Rocher De Boule veins; the main points of
difference are in the relative proportions of the metallic minerals present,
and in the fact that the lead-zine mineralization is not present in the Delta
veins.