Home >  Term: hard bottom
hard bottom

A condition encountered in some open-cut mines wherein the rock occasionally will not be broken down to grade because of an extra-hard streak of ground or because not enough explosive is used. This is called a "hard bottom"; it interferes with work and puts 1455 undue strain on a shovel. Such unbroken ores usually are drilled with a jackhammer and blasted.

0 0

ผู้สร้าง

  • ed.young
  • (Milwaukee, United States)

  •  (V.I.P) 21084 points
  • 100% positive feedback
© 2024 CSOFT International, Ltd.