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APPENDIX 487
The sand consisted of colourless transparent quartz, not
unfrequently presenting the bright glassy lustre of broken
quartz crystal; the surfaces were, however, for the most part,
more or less dulled by abrasion. It contained a few flakes of
silvery mica, and, as Mr. Adams— to whom I handed a small
quantity for microscopical examination— informs me, an occasional
fragment of felspar. It is on the whole exceedingly
fine, 52 per cent, of the same passing a sieve of ninety meshes
to the linear inch; 16 per cent, one of seventy- five meshes;
15 per cent., one of sixty- six meshes, and 9 per cent, one of
fifty meshes, leaving a balance of 8 per cent, as rejected by
the latter.
Subsequent to the foregoing examination, Mr. A. S.
Cochrane, of this Survey, handed me a specimen which he
collected, and which differs from the above in that it does not
appear to contain so much water, and the bituminous matter
partakes more of the nature of asphalt. At the temperature
of 65° F. it is quite hard, fragments may be chipped off with
a hammer, and it is reducible in a mortar to a non- coherent
pulverulent condition; at 100° F. it barely yields to pressure,
and is only slightly adhesive; at 150° F. it gives to the touch
and is somewhat sticky; at 200° F. it is quite soft, and may
be readily moulded.
MALTHA OE MINERAL- TAR.
From the right bank of the Athabasca, about twelve miles
below its confluence with the Little Red River; collected by
Mr. A. S. Cochrane.
This material also occurs at several other points farther
down the river, and is identical with that referred to in the
prefatory remarks.
The sample in question had a pitchy- black colour in thin
layers, and by transmitted light, rich, dark reddish- brown. The
specific gravity at 60° F. was found to be 1.023; at this temperature
it has the consistence of a soft extract, and will barely
flow; at 70° F. flows, but sluggishly, whilst at 100° F. it has
the consistence of treacle.
As regards the utilization of these substances, the most
appropriate application of the former, and that for which it
would appear to be admirably adapted, would be for asphalting
purposes. It has one of the most important qualifications of
a good bituminous concrete, viz., intimate combination of the
mineral and organic constituents, and this in a degree which
Object Description
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| Title | Page 511 |
| OCR | APPENDIX 487 The sand consisted of colourless transparent quartz, not unfrequently presenting the bright glassy lustre of broken quartz crystal; the surfaces were, however, for the most part, more or less dulled by abrasion. It contained a few flakes of silvery mica, and, as Mr. Adams— to whom I handed a small quantity for microscopical examination— informs me, an occasional fragment of felspar. It is on the whole exceedingly fine, 52 per cent, of the same passing a sieve of ninety meshes to the linear inch; 16 per cent, one of seventy- five meshes; 15 per cent., one of sixty- six meshes, and 9 per cent, one of fifty meshes, leaving a balance of 8 per cent, as rejected by the latter. Subsequent to the foregoing examination, Mr. A. S. Cochrane, of this Survey, handed me a specimen which he collected, and which differs from the above in that it does not appear to contain so much water, and the bituminous matter partakes more of the nature of asphalt. At the temperature of 65° F. it is quite hard, fragments may be chipped off with a hammer, and it is reducible in a mortar to a non- coherent pulverulent condition; at 100° F. it barely yields to pressure, and is only slightly adhesive; at 150° F. it gives to the touch and is somewhat sticky; at 200° F. it is quite soft, and may be readily moulded. MALTHA OE MINERAL- TAR. From the right bank of the Athabasca, about twelve miles below its confluence with the Little Red River; collected by Mr. A. S. Cochrane. This material also occurs at several other points farther down the river, and is identical with that referred to in the prefatory remarks. The sample in question had a pitchy- black colour in thin layers, and by transmitted light, rich, dark reddish- brown. The specific gravity at 60° F. was found to be 1.023; at this temperature it has the consistence of a soft extract, and will barely flow; at 70° F. flows, but sluggishly, whilst at 100° F. it has the consistence of treacle. As regards the utilization of these substances, the most appropriate application of the former, and that for which it would appear to be admirably adapted, would be for asphalting purposes. It has one of the most important qualifications of a good bituminous concrete, viz., intimate combination of the mineral and organic constituents, and this in a degree which |
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