The ratio of ore area to total explored area, measured in the plane of the footwall, was 21-½ per cent.
The total area of ore measured on the footwall was 785 acres.
To these timbers are fixed small timbers along the footwall, to which are fastened the lagging and ladders.
But the hardest rock of the hanging or footwall, however, is seldom as hard as the harder class of ore.
Stringers are given the same characteristics as veins, but divided into hanging, footwall, and other varieties.