91

about 40 feet long and 20 feet high. No remaining ore was noted.
A lamprophyre dyke, from 2 to 10 feet wide, partly follows the vein-lode
on this level and extends down along the vein-lode to the Compressor and
Mill levels. At the southwest face (65 level) a lamprophyre dyke, 2 feet
wide, dips 70 degrees northwest and is in contact along its hanging-wall
with 12 inches of sheared rhyolite. The rhyolite is traversed by numerous
small calcite stringers, which carry a little pyrite and sphalerite. At the
northeast face of the same level is a lamprophyre dyke 7 feet wide. It is
cut by several vertical fissures, but no veins occur along them. Southeast
of the dyke the rhyolite is fissured over a width of 1 foot and contains
numerous small veinlets of sphalerite with a little galena and tetrahedrite.
This vein zone dips to the south at 60 degrees. On the Compressor level
the Ashman lode was stoped to a height of 15 feet for a distance of 20 feet.
Where the crosscut from the Henderson lode ineets the Ashman lode on
this level there is an 8-inch vein consisting of brecciated angular fragments
of rhyolite cemented by grey quartz, sphalerite, and arsenopyrite. At the
southwest face there is a sheared zone 20 inches wide along the contact of
lamprophyre dyke and rhyolite. The dyke is bleached and replaced by
carbonate and the sheared rock contains about 1 per cent each of sphalerite,
pyrite, and arsenopyrite. At the northeast face there are two fault fissures
6 feet apart dipping 50 degrees southeast, but neither carries any vein
matter. From the 500 level a stoped zone 240 feet long extends from 50
to 100 feet upwards along the Ashman vein-lode. Mine assay plans disclose
that this part of the vein-lode held high values in silver. Some of the ore
remains in the roof of the adit between the ore chutes. Eighty-five feet
southwest of the crosscut there are seven parallel fissures within a width
of 5 feet. A lamprophyre dyke 34 feet wide follows along the back with
rhyolite to the southeast. Both dyke and rhyolite are sliced, and for 8 to
12 inches along the contact the two rocks are highly fractured and
brecciated. The rock fragments are cemented by sphalerite, galena, and
tetrahedrite, which constitute up to 75 per cent of the lode matter. They
are accompanied by a little quartz, carbonate, and pyrite. The parallel
fissures in the lamprophyre contain small stringers and veins of these
sulphides ranging from ¢ inch to 2 inches in width. At the southwest
face of the drift (500 level) the fissuring is confined to a lamprophyre
dyke 4 feet wide. Calcite stringers occur along three of the fissures, but
no sulphides were seen. There is a sheared zone 1 foot wide in rhyolite
at the northeast face, but it contains only barren calcite stringers. The
Ashman vein on the 600 level was not examined as these workings were
flooded.

On the surface, at the northeast end of the combined Henderson-
Ashman vein-lodes, are two shallow shafts (See Figure 9) 140 feet apart.
The No. 1 shaft exposes 2 to 8 feet of fissured and altered dacite flow
breccia largely replaced by sphalerite and arsenopyrite with a little galena
and tetrahedrite. The lode is not well exposed at the No. 2 shaft, which
is full of water, but appears to be about 5 feet wide. On the dump there
is a large pile of ore, consisting of altered flow breccia replaced by the
same ore minerals as at the No. 1 shaft. Mine assay plans indicate that
the ore from these shafts averages about 0-3 ounce of gold a ton, with