196 ANNUAL REPORT 
dinary capacity of the kilns would be 5co barrels, but owning to the 
troublesome material, it is only about 200 barrels. Sometimes large 
blocks of clinker must be chiseled out from the kiln, and of course re- 
jected. 
Aside from this difficulty, the quality of the cement is good, it having 
been used successfully in a great many building operations. A peculiar 
and interesting fact observed is the tendency of the burnt pieces of the 
stone to split up into small cubes on weathering, affording a striking ex- 
ample of the influence of the crystallization of the pyrites upon the bed 
structure of the whole deposit. 
The maximum thickness of the hydraulic rock is said to be 27 feet 
the greatest thickness at which it is mined is eight feet, but as a rule 
about four to five feet are quarried. There are two layers of the stone, 
which shows a most decided shale structure, and is easily mined. One is 
a black, the other a gray shale; the first contains the greater amount of 
bitumen. At this mill, 200 barrels of cement can be produced per day 
with 11 men, distributed as follows: 
I engineer, 
kiln men, 
general help, 
mill men, 
quarry men, 
driver with team. 
By using a rotary kiln in which a distinct roasting stage is main- 
tained it is quite probable that this stone could be burnt much more sat- 
isfactorily. It is the intention of the proprietor, Mr. Frank Wilhelm, to 
restime operations on a larger scale. 
a Oe OS 
