CRANE. | Economy of Mining Operations. 361 
ways and various forms of rope and cable haulage in many 
mining districts it would seem practicable to employ the same 
here: 
The Brown Conveyor Company, of Cleveland, Ohio, has 
on the market an excellent form of conveyor, used largely in 
handling ores. Plate XLVII. Thesimpler and cheaper forms 
of such conveyors might be used to advantage here. The Tren- 
ton Iron Works, of Trenton, N. J., also deal in all forms of 
rope haulage, and have supplied many mining districts with 
systems of ore transference. A form of rope haulage, known 
as the Bleichert system, was employed at the Ozark Mining 
Company’s plant, and, as far as it was possible to ascertain, 
proved perfectly satisfactory in all respects. 
HOISTING. 
Hoisting from the comparatively shallow workings of this 
district is carried on about as economically and to as good 
advantage as possible, except possibly there might be an ad- 
vantage in the use of balanced hoisting, but when the mining 
operations reach the lower levels it would be unwise to con- 
tinue the present practice, but balanced hoisting with cages 
should be employed. Ina few instances cages are employed, 
and by their use the capacity of the hoisting plant and the 
ease of handling the ore are much increased. 
FEEDING. 
The feeding of ore to the crusher, from which it is in turn 
fed to the other concentrating apparatus, is a phase of treat- 
ment which demands close study and careful adjustment. 
This has not, however, until within the last year, received 
any attention other than to simply crowd everything that 
comes to the crusher room through the crusher, regardless of 
its quality, quantity, and size. The sizing of the material 
from the mine was the first step taken toward improving the 
method of feeding, and this was done mostly to separate the 
boulders and all that could not be passed through the crusher 
from the smaller sizes, so that it could be reduced by hand 
and hand picked to a limited exteat. Few mills, however, 
have introduced sizing apparatus, such as grizzlies, in the 
crusher room. 
