186

Tonnage Estimate

Proved Ore: The only part of the deposit that can in any sense be
classified as proved ore (developed on three sides) is the double pyramid of
magnetite, whose common base is the triangular section shown in the
section on line A-B (Figure 30), and whose heights are represented by the
lengths of the lines from this section to the two opposite ends of the exposure.
2,800 (square feet, area of triangular section) X 320 (feet, height of double
pyramid) + 3 (for volume of pyramid) + 8 (for cubic feet per ton) =
37,300 tons.

Probable Ore: Included within a volume outlined by the present
slope area of exposure, and a depth along the dip of 60 feet (to the breasts
of the two tunnels), less the tonnage of proved ore. 13,200 (square feet,
slope area of exposure) X 60 (feet, depth) + 8 (cubic feet per ton) —37,300
(tons, proved ore) = 61,700 tons.

Possible Ore: No estimate can be made, but it might be stated ap-
proximately, that for every 100 fect of additional depth along the dip,
below the limit of probable ore, with the same cross-sectional area as is
exposed, there would be included 165,000 tons. This tonnage is not
as speculative as the corresponding figures for the Sirdar deposit.

Value of Deposit

As far as can be judged from present exposure and development, the
Little Bobs-Baden Powell deposit is not of sufficient magnitude to become
by itself a commercial iron mine. Its economic possibilities, however,
should be considered in its relation to the other Bugaboo Creek deposits
(See below).

Bibliography
See page 158 for further details

6. Carmichael, H., p. 219.
16. Lindeman, E., p. 10.
17. Clapp, C. H., pp. 189-193.
20. Lindeman, E., and Bolton, L. L., p. 5.
21. Brewer, W.M., p. 14.
22. Whittier, W. H.

(46 f) General French and General Warren Claims

Magnetite occurs on these claims (See Figure 27), more particularly
on the General French, about 1,200 feet east of the Baden Powell-Little
Bobs deposit and 200 feet lower in elevation. No published or previously
reported description of this occurrence is available. Present exposures
reveal only a small deposit. Magnetite is exposed in a stripping showing
a bluff of ore 20 feet high and 15 feet wide. The deposit is bounded on
one side by crystalline limestone, and on the other by a mass of fine-
grained diorite or andesite, which is in dyke form, having limestone on its
other side. Considerable stripping had been done years ago around this
occurrence, and a tunnel, now caved, had been driven into it. No magnetite
float was visible above this exposure. The magnetite is of fairly good
quality with only small amounts of intermixed pyrite.