FIELD: mining industry, particularly to open and prepare underground part of kimberlite deposit.
SUBSTANCE: method involves cutting open mine by excavation ledges; driving inclined bores outside sliding wedge and ore body; driving paired and horizontal workings connected one to another along lower ledge; driving paired inclined workings to be connected one to another towards lower designed venting and haulage horizons and beginning preparation of ore body for further development along above horizons before horizon opening by driving main opening vertical or inclined workings; driving counter-workings from opened venting and hauling horizons towards main opening workings.
EFFECT: reduced time of underground deposit part preparation, increased simplicity and venting reliability.
1 dwg
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