54

over 100 feet eastward from the portal of No. 3 adit, but has not been
prospected in that direction.

No. 4 adit is at an elevation of 5,050 feet, 100 feet from the junction
of the inclined surface tram and the narrow gauge railway, and about
900 feet north-northwest from No. 3 adit. Most of the ore from the
uppermost fissure zone was taken out by way of this adit. From the
portal the adit runs as a crosscut about 675 feet northwest to the vein,
and there is about 1,200 feet of drifting along the vein on this level. A
winze was driven down 200 feet on a 60-degree slope and considerable
drifting and stoping were done from that level. The adit is blocked 400
feet from the portal and, therefore, workings could not be examined
during the 1987 season.

The portal of No. 5 adit is 900 feet northeast of No. 4 adit at an
elevation of 5,160 feet. The uppermost main fissure outcrops a few feet
above the portal and a smaller parallel vein lies 25 feet farther north.
The adit was driven as a crosscut for 35 feet to the main fissure zone,
with 700 feet of drifting along it to the southwest. In the drift the zone
has an average strike of south 75 degrees west and dips from 60 to 65
degrees north. It is stoped out below this level for a length of 40 feet
at the east end of the drift and for a length of 120 feet starting at a point
425 feet farther west. Above the latter opening, the roof of the drift is
stoped for 80 feet along the strike of the zone. Another stope, which
measures 50 feet along the strike of the zone, extends upwards at the west
end of the drift and a little more high-grade ore was taken from a small
stope 340 feet from the portal. At 140 feet west along the main drift, a
crosscut, which runs 95 feet northwest, cuts a 6-inch fissure zone 30 feet
northwest of the main zone. At 250 feet west along the drift, this second
zone is intersected again by a 15-foot crosscut and considerable ore has
been removed here in a 25-foot drift and stope. The northern zone at
either end of the drift ranges from 8 to 4 feet in width and is well mineral-
ized with chalcopyrite. On the south side of the main zone opposite the
15-foot crosscut a winze goes down and connects with the No. 4 adit
workings.

For most of its length the remaining parts of the main zone where
exposed in the roof of the adit average about 15 inches in width and
carry from 1 to 3 per cent of chalcopyrite, but in some places the zone
consists only of rusty, softened, altered granodiorite very barren in appear-
ance. A 15-inch channel sample of this material taken from the roof of
the adit 130 feet west along the drift assayed: gold, 0-05 ounce a ton;
silver, 7-39 ounces a ton; copper, 7°17 per cent.

Neither the main zone nor the one lying 25 feet north of it has been
prospected more than a short distance easterly from the portal of No. 5
adit. According to O’Neill’s plan of the underground workings (Memoir
110, page 8), the east drift of No. 4 adit extends roughly 150 feet farther
east to a large quartz diorite dyke. Presumably, drifting was stopped
when the zone was found to pinch on striking the dyke, but judging from
experience in other parts of the mine, the zone will be normal widths on
the east side of this dyke. The main zone is exposed at intervals along
the surface for over 1,500 feet in an easterly direction from No. 5 adit.
Immediately east of the adit it is concealed by talus, but from a point