RU2187643C2 - Method of combined mining of mineral deposits in opencast contour zone - Google Patents

Abstract

FIELD: mining. SUBSTANCE: method includes opencast and underground mining operations, extraction of separating pillar, construction in opencast of internal dump of overburden rocks at opencast flank, solidifying of filling zone with solidifying mixtures. Internal dump is constructed by layers with leaving pockets between dump and opencast flank, and zone of filing which forms artificial ceiling is solidified by filling of said pockets with solidifying mixture, for instance, rubble concrete. After that, separating pillar is extracted by underground method under protection of formed artificial ceiling. EFFECT: reduced capital outlays for extraction of mineral with preserved opencast flank, reduced mineral losses and impoverishment. 1 dwg

Description

 The invention relates to mining and can be used in a combined method of mining.

 There is a method of mining minerals from the sides of quarries, including the development of minerals with the movement of the fronts of underground and open pits with the laying of the mined-out space of the chambers and loading the side of the quarry, put in the limit position [1].

 The disadvantage of this method is the limited scope, conservation of ore reserves prepared for excavation in temporary pillars, which leads to a decrease in the productivity of the quarry.

 There is also known a method of combined development of minerals in the marginal area of the quarry, including loading the bottom of the side of the quarry with overburden, followed by strengthening them by drilling wells from underground workings and supplying a hardening solution to the strengthened zone [2]. Prototype.

 The disadvantage of this method is the high material costs.

 The present invention allows to obtain a technical result, expressed in reducing the cost of mining the mineral while maintaining the stability of the side without increasing losses and dilution.

 The technical result is achieved by the fact that in the method of combined development of minerals in the contour zone of the quarry, including open pit and underground mining, the development of a separation pillar, the construction of an internal dump of overburden, loading the side of the quarry, the strengthening of the bulk zone with hardening mixtures, the construction of the internal dump layer by layer with the sinuses between the dump and the side of the quarry, the strengthening of the zone of the pile, forming an artificial ceiling, is done by filling the mentioned sinuses settable mixture, such as rubble concrete, whereupon protected artificial potolochiny lead refinement separating pillar underground method.

The invention:
Minerals are mined by open pit and underground operations by working out overburden and mining ledges to the limiting contour of the quarry and working out the dividing pillar underground. In the quarry, the mine exit section is loaded with an internal dump in layers, leaving sinuses between the slope of the internal dump and the side of the quarry, followed by filling the sinuses with a hardening mixture (for example, concrete), which creates an artificial ceiling between open and underground mining, and a separation ore the pillar is worked out under an artificial ceiling underground.

 In the proposed method, new features in comparison with the prototype are: the formation of an artificial ceiling is made without grouting wells.

 The drawing shows a schematic diagram of the construction of the internal blade and the creation of an artificial ceiling.

 The method is as follows.

 When conducting open pit mining in the quarry, the mine exit section 4 is loaded with an internal dump 1, which is erected in layers with the sinuses 2 between the slope of the internal dump 1 and the side of the quarry 3, followed by filling of these sinuses 2 with a hardening mixture, for example, concrete, due to which creates a fortified zone in the form of an artificial separation pillar (artificial ceiling) between open and underground mining, and the separation ore pillar 4 is worked out under the protection of art vennogo pillar underground mining.

 Using the proposed method for the combined development of minerals in the contour zone of the quarry will reduce the capital cost of mining the mineral while maintaining the stability of the side and reduce losses and dilution.

Sources of information
1. USSR author's certificate 1176078, "The method of combined development of minerals in the marginal zone of the quarry", IPC E 21 C 41/00, publ. 1985, bull. 32.

 2. USSR author's certificate 1176077, "Method for the combined development of minerals in the marginal zone of a quarry", IPC E 21 C 41/00, publ. 1985, bull. 32.

Claims (1)

 A method for the combined development of mineral deposits in the marginal zone of a quarry, including open pit and underground work, development of a separation pillar, construction of an overburden internal dump in the quarry, loading the quarry side, strengthening of the pile zone with hardening mixtures, characterized in that the construction of the inner dump is carried out in layers with leaving sinuses between the dump and the side of the quarry, and the strengthening of the zone of the pile, forming an artificial ceiling, is done by filling the mentioned sinuses tv rdeyuschey mixture, e.g., rubble concrete, after which the formed artificial protected potolochiny lead refinement separating pillar underground method.