THE EFFICIENCY OF BLASTING VERSES CRUSHING AND GRINDING. Run of mine rock size is measured as it enters the primary crusher through the use of a video camera and a pc-based, digital image analyzer.(Grannes,1994) A size of 80% passing .5 m(19 in.) is used. Crushing is done in three stages, reducing to 80% passing 2 cm (3/4 inch).
Blasting is necessary to break rock from the ground, prior to it being taken for processing. In the early days of aggregate quarrying, explosives were not used particularly scientifically although some attempts were made to optimise use to minimise cost and maximise output.
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2002-2-7 karst rocks may host ore deposits contain-ing lead, zinc, iron, and gold. Much of the resource extraction conducted in areas of karst is for the rock itself. Unweathered carbonate rocks pro-vide crushed stone and dimension stone resources. The term “ crushed stone ” refers to the product resulting from the crushing of rocks such that substan-
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Bender (1999) defined production blasting as the type of blasting that is designed to fragment a predetermined volume of rock; widely spaced holes are drilled and fired in a controlled delay sequence.
With the exception of those who work in the building trades, the closest most of us ever come to “virgin” aggregate (that is, aggregate that comes straight from an aggregate mine and has not been reclaimed from rubble or other debris) is at home building stores.
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