234

the occurrence as shown in the idealized cross-section, almost the entire
surface of the two claims becomes good prospecting ground. It is not
likely that any of the ledges will attain a great depth because of the prob-
able occurrence of diorite in the core of the ridge, but this comparative
shallowness may be compensated by a number of parallel ledges.

Analyses

The following analyses are taken from published descriptions of the
deposits:

— A B Cc
lie) Peay hota bpHBSHEOCNeh open donanintion wnbarseosndpososnben 66-42 66-17 56-8
Phosphorus... 0-016} Trace
Sulphur....... 0-017 0-1
[1b Coen eae een A REE ormoa nd lorsentueddonl budcedonesdallacddooosuaes 1:6
Insolublew.escessoosene aoe eee GEaosoNdoGoONGOO.UOONNAllsGouncDb0000 fo: lle deooodesouc

A. Carmichael, H.: Ann. Rept., Min. of Mines, B.C., 1906, p. 85. ‘‘Analyses of average
sample.”

B. Lindeman, F.: Bibliography, No, 16, ‘‘Average sample taken along the cut.’’

C, Brewer, W. M.: Bibliography, No. 21, ‘‘A general sample representing about an average of
the deposits.”

Development

The deposits suffer from lack of development and nature has done
far more than man to demonstrate their size. There are a large number
of old strippings that are now overgrown with moss or otherwise obscured;
many old open-cuts of small size now partly caved; and one short tunnel
driven into the hanging-wall of the bluff magnetite body, for a total dis-
tance of 10 feet.

Consequently not enough development has been done to permit an
engineer to use a figure greater than 5 feet for the average depth of proved
ore.

Tonnage Estimate

With an average assured depth of exposure of 5 feet, and an area of
exposure of 138,600 square feet, one might estimate about 8,500 tons as
proved ore. As the basis for an estimate of probable ore it is reasonable
to suppose that these tabular bodies of magnetite will continue down the
dip a distance equal to half of their exposed length: The magnetite con-
tained within such dimensions (less the above figure for proved ore) would
amount to approximately 51,500 tons (at 8 cubic feet per ton).

It is likewise possible that these deposits will either continue to vertical
depths of at least 100 feet as an average, or, if one ledge lenses out another
may come in so as to maintain the average; and the tonnage comprised
within the volume represented by 100 feet of depth and present exposures,
exclusive of probable ore above listed, would be 110,000 tons. Every
additional 100 feet of deptli would give 170,000 tons. No data are at
hand to indicate the maximum depth of mineralization, but it would not
be safe to extend the limits of possible ore below 100 feet of depth, unless
further explorations should reveal new facts of occurrence.