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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