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CHAPTER VIII.

BORE-HOLE RECORDS.

In this chapter are given records of several of the bore-holes

which have been put down on Graham island in search of coal
or lignite.

Graham Island Collieries.

Bore-hole No. 1. Put down on left bank Yakoun river
in the N.W. i, S.E. 4 sec. 30, tp. 7.. Depth of hole, 1,100 feet (2):
Diamond drill used.

The core of this hole, which was started in slaty argillites
of the Maude formation whose attitude is north 65 degrees
east, dip 15 degrees northwest, consisted of black dense slaty
argillites, much intersected by dacite and andesite dykes of
the Etheline formation. No other rocks were observed, and
the core was not measured in detail.

Bore-hole No. 2. Put down 35 feet in a north 75 degrees
east direction from southwest corner post of sec. 18, tp.4.

Depth of hole, 1,500 feet. Diamond drill used. Size of core,
3 inches,

Description of Core. Thickness Depth
feet. feet.
(A pproximate).

Light greenish-grey, fine, hard, even-grained, tuface-

ous sandstone with some coarser and softer tuff

layers pees es fae RR SS eee 157 157
Green, uneven-grained, angular agglomerate, irregu-

lar fragments up to 14 inches in a large percent-

age of matrix, much replaced by calcite. Beds

are up to 10 feet thick, and vary slightly in

texture. Several intrusions of andesite up to

SESE thick doce TO SS ea 500 657
Light greenish-grey, very massive, and homogeneous

tuff and feldspathic sandstone, with a few coarser

layers, up to 2 feet thick, and dacite or andesite

RN i ee heey oar Set ee 250 907
Grey, massive, feldspathic sandstone, or tuff, rather

coarse, seamed with calcite veins............. 50 957

Se Oe

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