44

From Huston inlet to the junction of the two trails is about 13 miles. At
a farther distance of 550 yards along the trail to Jedway, a branch trail
leads eastward up the mountain side and in a distance of 500 yards and at
an elevation of 1,100 feet ends at the workings on the Hercules claim.
These consist of two tunnels, one 23 feet long and the other 12 feet long,
and several trenches and strippings on a steep slope facing south and
broken by several narrow gullies. ;

The prospecting work has been done within a mineralized area which
extends for 150 feet east and west along the slope, has a breadth of 80 feet,
and is visible through a vertical height of 70 feet. This general area is
only partly exposed and its extent may be somewhat greater than the
above figures indicate. It is traversed by a few, dense, unaltered dykes
and has been at least partly developed in diorite or granodiorite. It is
formed mainly of greenish garnetite with a varying quantity of magnetite,
and, locally, considerable coarse calcite, some quartz, and a little pyrite
and chalcopyrite. In places magnetite is scarce, in other parts it occurs
in streaks and patches, and in several places is fairly evenly disseminated
and forms about one-half of the mineralized matter. The material richer in
magnetite forms two areas the larger of which measures 20 feet by 60 feet,
but for the most part contains too much gangue to be considered iron ore.
Even if the larger of the two areas were pure magnetite, the probable amount
of ore present would not exceed 10,000 or 15,000 tons.

(10 k) Thunder Mineral Claim Group, Collison Bay,
Moresby Island

(See Figure 6)

The Thunder group consists of the Thunder, Spade Flush, and Sadie
mineral claims, owned jointly by J.S. MeMillin of Seattle and I. Thomp-
son of Jedway. They lie on the northwest slopes of the valley which
extends southwest from Collison bay. <A trail from the bay leads to the
entrance of a tunnel on the Thunder claim at an elevation of 600 feet,
the Sadie and Spade Flush claims lie northwest at a higher elevation.
The Thunder claim has been developed as a copper prospect and no mass
of iron ore more than a few feet square has been found on it. Magnetite
in considerable amounts occurs on both the Spade Flush and Sadie, but
beyond a small amount of stripping and a few shallow trenches no pros-
pecting work has been done on the magnetite bodies.

In the general neighbourhood of the claims, the country rocks are
poorly exposed. The few outcrops indicate that the strata consist mainly
of dark, fine-grained intrusive rocks with associated masses of limestone.
Fine-grained rock types of various kinds are numerous and there are dykes or
relatively small bodies of intrusive granodiorite and diorite. The outcrops
of magnetite are confined to two areas, each of which lies at an elevation
of 1,000 feet on low, spur-like projections on the mountain side. The two
areas are separated by a shallow, drift-covered depression 800 feet broad.

The magnetite outcrops on the Sadie claim occur in four groups (See
Figure 6) on the opposite slopes of a gully 1,300 feet west-southwest of the
tunnel entrance on the Thunder claim. At locality 1 (See Figure 6)
magnetite is exposed over an area 45 feet by 15 feet. At one end of the
outcrop considerable sulphide is present. The rest of the showing consists