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FEATURES OF OPTIMIZING THE CALENDAR SCHEDULE OF OPEN-PIT MINING BY STEEPLY INCLINED LAYERS
Abstract
The transition to mining benches with transverse panels from top to bottom within the boundaries of steeply inclined layers does not allow transforming the results of mininggeometric analysis sequentially for each individual stage of mining into a calendar schedule of mining operations. Therefore, a model is offered for converting the results of mining-geometric analysis into a calendar schedule of mining operations with sequential mining of benches from top to bottom using phased volumes of overburden rocks and ore reserves of adjacent steeply inclined layers. Each next stage of mining includes ore reserves of the previous steeply inclined layer and volumes of overburden rocks of the adjacent steeply inclined layer. In this case, the time of simultaneous mining of ore reserves and overburden in adjacent steeply inclined layers is assumed to be equal and should ensure the fulfillment of the annual design volumes of ore extraction. A reduction of overburden excavation, due to a significant increase in the slope angle of the pit walls of the steeply inclined layers, is achieved with the provision of independent high-rhythmic overburden and mining operations even on round shaped open pit fields. The studied technology of mining benches transverse panels in steeply inclined layers below the thickness of loose overburden rocks could improve technological development of deep and ultra-deep open pit mines, especially with combined motor-conveyor transport. Optimization of the calendar schedule of mining operations when mining rock overburden and ore with transverse panels in steeply inclined layers was performed at the ultra-deep Kacharsky open pit mine.
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