==

albite and carbonates. Not all of the common sulphides are present
in each deposit. Though in places some gold is free it is probably
mainly in the pyrite. Gold assays commonly range from 0.5 to 1.25
ounces to the ton, though in many deposits they fall below this

and may be absent altogether. The veins are in the main less than
3 feet wide, their length rarely exceeds 1,000 feet, and their
extent down the dip is usually only a few hundred feet. Some are
considerably larger and in most localities there are a number of
veins.

In areas of bedded rocks most of the important veins
either occur along the bedding mainly near anticlines, crumples,
and faults, or they lie in and along large dykes, laccoliths, and
stocks, and very rarely in sills. The veins in bedded rocks are
generally the largest. Those occurring in anticlines are commonly
thicker along the crest of the anticline and pinch out in both
directions dowm the dip. In areas of volcanic rocks the deposits
are in places in the form of many, small, irregular lenses and
stringers, elsewhere they occur in joints or parallel shear zones.
The deposits, however, are lenticular. They start near the edges
of bodies of the albite-rich intrusives either within or outside
of the intrusive body, and as they extend away from the intrusives
they widen rather abruptly to their maximum thickness, and then
tend to taper off, all in a range of one to several hundred feet.

Bornite-chalcopyrite-pyrite deposits with low gold and
silver values occur in the rhyolite dykes on the Canyon, Grotto,
Algoma, and other properties. Similar copper deposits, possibly
related, oceur throughout a wide area from Kitsalas and Bornite
mountain northeastward to Sand and Legate creeks. As a rule,
however, the grade of the ore is mainly low.

The younger andesine grenodiorite shows evidence of

associated mineralization by the presence at some contacts of quartz