220с
COMPRISING
DESCRIPTIONS OF METHODS OF SUPPORT IN EXTRAC TION OF ORE, DETAILED DESCRIPTIONS OF METHODS OF STOPINGf AND MINING IN NARROW AND WIDE VEINS AND BEDDED AND MASSIVE DEPOSITS INCLUDING STULL AND SQUARE-SET MINING, FILLING AND CAVING METHODS, OPEN-CUT WORK AND A DISCUSSION OF * COSTS OF STOPING
BY
WALTER R. CRANE, Ph.D.
i^y^ jean of the school of mines and metallurgy, and professor of mining, the ...(Información más detallada)pennsylvania state college
It
FIRST EDITION FIRST THOUSAND
NEW YORK
JOHN WILEY & SONS London: CHAPMAN & HALL, Limited iqio
