Churn-drills, [92].

Chutes, loading, in vertical shaft, [86].

Classification of ore in sight, [13], [16].

Combined shaft, [58], [67], [68], [69], [70], [72].

stopes, [96], [101].

Commercial value of projects, determination, [188].

Compartments for shaft, [76].

Compressed-air locomotives, [135].

-air pumps, [141].

vs. electricity for drills, [145].