This process entailed
much expense. The stuff had first to be broken on the surface,
then sent below, trucked along the drives, and finally
shoveled into place. Ventilation was impaired and the drives
were filled with dust. The men worked in discomfort, and were
not in a condition to perform a full measure of labor. Under
the system as adopted in the Proprietary mine, these
disadvantages disappear. The cost is one-third less,
ventilation is perfect, and every portion of the faces are
accessible at all times. Sawn timber is used throughout; the
upright and cross pieces are 10 inches by 10 inches, and stand
4 feet 6 inches apart; along the course of the drive, the
cross pieces are five feet in length, and the height of the
main drives and sill floor sets are 7 feet 2 inches in the
clear. In blocking out the stopes, the uprights are 6 feet 2
inches, just one foot shorter than those in the main drives.
The caps and struts are of the same dimensions and timber as
the sill floor. The planks used as staging are 9 inches by 21/2
inches; they are moved from place to place as required, and
upon them the men stand when working in the stopes and in the
faces.
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