. Bulletin . t differenttimes, whereas a duplication of machinery is necessary for simulta-neous stripping and quarrying. It is also quite possible that some ofthe more efficient stripping equipment, such as overhead cablewayhoists or drag-line scrapers, could not be used in many instances ifrock quarrying were conducted at the same time as stripping, as thestripping equipment would be too much in the way of rock-quarryingoperations. Furthermore, the power plant may be overloaded to thepoint of doubtful economy. Where blasting is done in quarrying or stripping it is often neces-sar3% when shot
. Bulletin . t differenttimes, whereas a duplication of machinery is necessary for simulta-neous stripping and quarrying. It is also quite possible that some ofthe more efficient stripping equipment, such as overhead cablewayhoists or drag-line scrapers, could not be used in many instances ifrock quarrying were conducted at the same time as stripping, as thestripping equipment would be too much in the way of rock-quarryingoperations. Furthermore, the power plant may be overloaded to thepoint of doubtful economy. Where blasting is done in quarrying or stripping it is often neces-sar3% when shots are fired, that both gangs suspend work while seek-ing places of safety, perhaps at great loss of time. Where the floor is stripped ready for a whole seasons work, a clearfield is provided for quarry operations. The quarryman can placehis derricks more advantageously and plan his work better when awide area is stripped and when there is no conflict with otheroperations. BUREAU OF MINES BULLETIN 124 PLATE II. ,1. QUARRY WORKING FACE FOULED BY STRIPPINGS DEPOSITED IN THE PIT.
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