66

tion of clay deposit depends also on the amount of overburden that has to
be removed before excavating can commence; the facilities for washing;
whether the clay be residual; the size of the deposit—10,000 cubic yards is ©
probably a minimum—and above all on the cost of transportation to the
nearest market. Before expenses are incurred in developing a prospective
clay deposit it should be thoroughly sampled. The samples should be
forwarded to the Mines Branch, Department of Mines, Ottawa, for testing.
If two or more large portions of the deposit apparently vary in character
they should be sampled separately. Each sample should weigh from 5 to
10 pounds, and should be taken at equal intervals across the part of the
deposit that it is intended to represent. |
Table X.—Value of the Production! and Imports of Clay and Clay Products
in Canada.

1915. 1916. 1917. 1918.

}

Produc- | Imports. | Produc- | Imports. | Produc- Imports. Produc- | Imports.
tion. ; tion. tion. tion. \

| | | | |
ae —_____—.

Kaolin..... $ 13,000 |$ 124,658. |$ 17,500 |$ 114,110 |$ 9,594 |$ 97,856 |$ 19/299 |$ 116,699

Fire-clay : ed

and fire-clay BY ear
products?} 110,693 87,267 | 234,562 187,124 | 326,511 | 283,746 397,458 401, 357

Total for all :
clay pro- '
ducts...../3,914,488 |2,998,463 |4,120,805 |4,554, 167 |4,779,038 |6,610,837 |4,583,489 6, 734, 081

1 McLeish, John, ‘‘Mineral production of Canada in 1916,’ ‘‘ Preliminary report of the mineral
production of Canada for 1917 and 1918’’, respectively. se

2 The value of imports under this heading covers only fire-clay, ground or unground, and does
not include firebrick or other refractory brick such as magnesite or silica brick, the values of the
imports of which were: 1915—$813,071; 1916—$1, 657,792; 1917—$3, 156,591; 1918—$3, 712, 677.

The production figures do not include production from imported materials. Production from
this source in 1915 was $28,807; in 1916—$22,484; 1917—$61,317; 1918—$84, 018.

f a

Average Prices of Clays and Clay Products.

‘ 1915. 1916. 1917. 1918.

Kaolin, crude per ton: 22 ti et $ 10 00 |$ 10 00 |$ 18 00 |$ 22 00
Fire-clay pettonisc: aster ee 2 00 350} 6 00 4 00-10 00
Common brick, per thousand........... pat, tide isp seers rks GAC 7 48 CEL. 9 49 | 11 14 (Prel).
Pressed or front brick, per thousand........... Seok BR pea 989 | 1095} 14 07 | 16 35 (Prel.)

aS Lee