SCIENTIFIC ASPECTS OF CHOOSING THE GEOTECHNICAL STRATEGY FOR MINING OF TRANSITION AREAS WHILE COMBINED MINING OF ORE DEPOSITS

Abstract

The paper shows the framework of the geotechnical strategy for mining transition areas by use of consequent
scheme when working ore deposits. On the basis of analysis and experience generalization of the mining some ore
deposits by the combined method is established that transition process is always accompanied by abrupt transformation of structure and parameters of the mining enterprise expressed in sharp change of character and technical and economic indicators of its activity. Two main
characteristics of the transition process are: a sharp
change in the value of the productive capacity of the enterprise and a surge in the value of capital investments.
The transition process at the combined mining is defined
as the mining of part of the field for the purpose to transfer
the mining enterprise from one stable state to another;
and the transition area is defined as part of the field,
within which organizational, technical and technological
measures are implemented, aimed at creating optimal
conditions for the underground mining of basic reserves
in a stable period, whit taking in account special factors
and conditions of the preceding open-pit mining. The
types of transition areas are systematized, the options of
underground geotechnology are developed, taking in account specific factors and conditions formed during the
open-pit mining and providing optimal conditions for the
development of underground mining at a new stable state.
The best option of geotechnological strategy according to
the criterion of capital and opening costs is determined by
the method of economic and mathematical modeling. The contribution was made to the development of scientific
foundations of the choice of geotechnological strategy for
the mining of transition areas at the combined mining of
ore deposits