554 W. L. UGLOW AND Ww. A. JOHNSTON.

Free gold may be recovered by panning oT rocking the upper
disintegrated and oxidized parts of many of these veins. The
veins in most cases are shattered and the sulphides are oxidized
to various depths up to at least 50 feet. Free gold has been found
only in this belt of weathering. In the zone of unaltered sul-
phides below, the gold content is contained almost entirely in
arsenopyrite and pyrite.

Selective sampling of the sulphides in the veins showed that (1)
as a general rule the galena is not auriferous but carries from one
third to one half ounce of silver to the unit of lead; (2) the pyrite
carries as high as $10.00 per ton in gold; and (3) the arsenopyrite
carries gold in amounts varying up to 135 Ounces per ton of pure
mineral. The arsenopyrite in particular, therefore, is sufficiently
auriferous to provide a possible source of gold for the placer de-
posits.

Character of the Vein Gold.—The vein or “ quartz ” gold,
found in the oxidized parts of the sulphide-bearing veins, occurs in
various sizes from very minute specks to pieces worth from $10.00
to $30.00. The latter size is not necessarily the maximum, but
represents the largest recorded piece of gold derived from the
veins during the course of their limited development. A mass of
gold worth 90 dollars is reported by mining men in the district to
have been obtained from the Perkins ledge in the early dayss ot
is possible that much larger pieces may occur. Most of the gold,
however, is in small grains.

The gold exhibits, to a more or less perfect degree, a crystalline
structure somewhat resembling a mosaic. Some specimens show
a distinct granular structure due to the presence of a large number
of minute gold crystals. The very fine gold is also crystalline.

Individual crystals and crystal groups are common. Some
of the crystals are nearly perfect, the common forms being the
dodecahedron, the cube, the cubo-octahedron, the octahedron, the
cubo-dodecahedron and the tetrahexahedron. A small tetrahexa-
hedron twinned on an octahedral face (spinel law) was found

2” Macpherson, J. A., “Cariboo Placers and Lodes,” Mining and Engineering
Record, vol. XXIV., 1919, P. 128,