development rock

development rock

[də′vel·əp·mənt ‚räk]
(mining engineering)
Rock containing both barren and valuable rock, broken during development work.
References in periodicals archive ?
The crushed product will improve the gradation of the development rock used.
When that is achieved, Kiruna expects to be operating just 10-12 large LHDs dedicated to production, with about four smaller units for clearing development rock.
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