A limestone mine has the following equipment at its primary production face: Excavator: a 15 yd3 (11.5 m3) front-end loader with 40 sec cycle time Trucks: five 100 ton (90 tonne) trucks Material: average blasted rock with medium-hard digging conditions Working conditions: average Haulage cycle time: 20.0 min (a) What is the sustained production rate of the sys

Principles of Foundation Engineering (MindTap Course List)

9th Edition

ISBN:9781337705028

Author:Braja M. Das, Nagaratnam Sivakugan

Publisher:Braja M. Das, Nagaratnam Sivakugan

Chapter5: Soil Improvement And Ground Modification

Section: Chapter Questions

Problem 5.5P

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Question

A limestone mine has the following equipment at its primary production face: Excavator: a 15 yd3 (11.5 m3) front-end loader with 40 sec cycle time Trucks: five 100 ton (90 tonne) trucks Material: average blasted rock with medium-hard digging conditions Working conditions: average Haulage cycle time: 20.0 min (a) What is the sustained production rate of the system in tons/hr, assuming 60 min of production per hour'? (b) Which equipment (loader or trucks) governs? (c) What improvements would you recommend to increase mine production without changing equipment?

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