51

thorough. Where sheared rocks are replaced the ore minerals occur dis-
seminated in well-defined shear zones and as narrow veinlets within the
mineralized zone. The copper deposits occur in four areas separated from
one another by stretches holding other types of deposits.

One small group of copper-bearing deposits exists in the vicinity oi
the Red Cliff mine and a second group occurs in the vicinity of the Dal-
housie mineral claims. The second group may. extend south to include the
holdings of the Prince John Mining Company. Both of these groups lie
west of Bear river. A third group of copper deposits is on upper Bear river.
It occurs on both sides of the valley and includes the George copper
deposits. A fourth group lies on upper Bitter creek and includes the Hill
60, Sunshine, LL and H, Black Bear, and other mineral claims. Some
deposits within the area occupied by the fourth group contain lead and zinc,
but nearly all contain copper minerals. The deposits of the other three
eroups are almost exclusively chalcopyrite deposits.

The significance of this segregation of the copper deposits is not under-
stood. The deposits may have been derived from intrusives of the Hazel-
ton group or they may have come from underlying granitic rocks of the
Coast Range intrusives. If the source is the Coast Range intrusives it is
strange that gradations from copper deposits to those of other types are
not of common occurrence.

The copper deposits have been mined in a small way. The gold con-
tent of some may make mining profitable.