Valuing ore in course of breaking, [102].

Ventilation, [72], [73].

Vertical deposits, entry, [62].

interval between levels, [88].

shafts, [62-70], [72], [85], [86].

capacity, [78].

Volume, specific, of ores, [14].

Waste-filled stope, [109].

Water-power, [126].

Weight per cubic foot of ore, [14], [15].