90

range from 4 inch to 6 inches wide, and average about 1 or 2 inches.
This condition is characteristic of small ore shoots seen elsewhere along
the Henderson and Fault Plane vein-lodes and probably also applies to
much of the ore mined from these lodes.

As the diorite dyke is approached on the McPherson level, the
Henderson vein-lode narrows. Individual fissures unite to form two or
three tight fractures; there is no cross fracturing and no sulphide-bearing
veins. On the northeast side of the dyke the vein is offset for possibly
10 feet to the southeast by a cross fault that lies close to the dyke. From
the dyke northeast to the face of the drift, a distance of 600 feet, the
vein-lode is well defined. For 200 feet northeast of the dyke there is a
single strong fracture along which the rhyolite is replaced over widths of
from 2 to 6 inches by quartz, arsenopyrite, sphalerite, and pyrite. A
shattered zone 25 feet long, ranging from 1 to 2 feet wide, occurs 240 feet
northeast of the dyke. Brecciated rock fragments from 1 to 6 inches in
diameter are cemented by sphalerite, arsenopyrite, and vein quartz, with
a little galena and tetrahedrite. Four hundred feet northeast of the dyke
a strong fissured zone, evidently the Ashman vein-lode, joins the Henderson
vein-lode from the northwest. At the junction of these two fissured zones,
the rhyolite is highly fractured and silicified over a length of 20 feet and
a width of from 2 to 10 feet. The silicified rock is traversed by a network
of sphalerite and arsenopyrite stringers, so that the mineralized zone
contains about 10 per cent of these sulphides. A representative sample of
this rock assayed: gold, 0-045 ounce a ton; silver, 0-53 ounce a ton;
(zinc not tested). From 50 to 130 feet northeast of the junction of the
two vein-lodes, vein matter consisting of sphalerite, arsenopyrite, and
vein quartz, with a little galena, tetrahedrite, and pyrite, forms the matrix
of a shattered zone of rhyolite, from 1 to 3 feet wide, composed of small,
angular fragments. From 25 to 50 per cent of the lode consists of
sulphides, sphalerite being the predominant mineral. The ore is traversed
by a few chalcedony veinlets up to 1 inch in width. A grab sample taken
from the back, 125 feet from the face, assayed: gold, 0-145 ounce a ton;
silver, 0-97 ounce a ton; zinc, abundant but not tested. At the face of
the drift are four parallel fissures within a width of 4 feet. Small cross
fractures connect them. The fissures contain quartz veins less than an
inch wide and the cross fractures are filled with 4-inch veinlets of pyrite,
sphalerite, and arsenopyrite. A 50-inch channel sample taken across the
vein-lode at the face assayed: gold, 0-03 ounce a ton; silver, 0-42 ounce
a ton.

On the 500 level, the northeast drift along the Henderson vein-lode
ends 20 feet within the diorite dyke. For 400 feet along the drift to the
dyke the vein-lode consists of two or more parallel fissures, which here
and there contain veins under 4 inches wide. A fault, striking southeast,
crosses the drift at the rhyolite and diorite dyke contact and appears to
have’ offset the vein-lode to the southeast. The lode probably continues
through and beyond the dyke, as it did on the McPherson level.

The Ashman vein-lode is developed by 210 feet of drifting on the
McPherson (65) level, 247 feet of drifting on the Compressor (245) level,
425 feet of drifting on the Mill (500) level, and a 100-foot drift on the
600 level. On the 65 level there are two small stopes in the roof, each