SU1661421A1 - Method for working ore deposits - Google Patents

Abstract

The invention relates to the mining industry and m. used in the development of powerful ore deposits systems with the collapse of overlying rocks. The goal is to reduce the dilution of ore by collapsed rocks. In the ore deposit, a haulage drift 1, ventilation openings 2, races 3 and a cutting slot 4 located at the border of the excavation section (WU) pass. The WU is divided vertically into the lower part 5 and the upper part 7, which are processed sequentially. The height of portion 5 VU is determined from the expression H = ^L. TGβ, where H is the height of part 5 of the control unit

L - WU length along strike, m

β is the angle of repose of collapsed rocks (OP), hail, and they begin to mine it from the ore massif towards OP 6. The mining is conducted by layer-by-side blasting of well fans and release of ore after blasting each fan. After blasting the last fan adjacent to the OP 6, the latter fills the developed space of part 5 of the TDU at an angle of repose. After that, they start working on part 7 of the substation unit by layer-by-side blasting of the fan wells from the cutting slit 4 towards OP 6. After testing part 7 of the substation, the developed space is filled with OP 6 at an angle of repose. The remaining emptiness under the roof is supplemented by the collapse of the roof rocks, for which wells 9 are blown.

Description

The invention relates to the mining industry and can be used in mining of powerful ore deposits with systems with overburden collapse.

The purpose of the invention is to reduce the destruction of ore by crushed rocks.

Figure 1 shows a section of the excavation area along the strike during the preparation period for working out the lower part of the excavation area; figure 2 - the same, during the period of working the upper part of the excavation area.

The method is carried out as follows.

Along the strike of the ore deposit, a haulage drift 1, ventilation openings 2, races 3 and a cutting slot 4, located at the border of the excavation section, pass. The excavation section is vertically divided into two parts: the lower and the upper, which are worked out sequentially. The height of the lower part 5 of the excavation site is determined from the expression hI tg / 3,

where h is the height of the lower part of the excavation area, m;

I - length of the excavation area along the strike of the deposit, m;

/ 3 - the angle of repose of the collapsed rocks, hail, and begin to conduct its mining from the ore massif in the direction of the collapsed rocks 6. The mining is conducted by successive layer-by-layer breaking off of the fans of the wells and the release of ore after the blasting of each fan. After blasting the last fan adjacent to the collapsed rocks 6, the latter fills the worked-out space of the lower part of the excavation section at an angle of repose, the lower end of the wedge of the collapsed rocks being at point A, corresponding to the projection of the vertical wall of the ore massif on the horizontal plane. After that, proceed to the development of the upper part 7 of the excavation site by layer-by-layer blasting of fan wells from the cutting gap 4 in the direction of the collapsed rocks 6.

When working out the bottom 5 and top 1

the parts of the excavation site, broken ore 8 is delivered by explosion force to the loading point, from where they are then delivered by self-propelled equipment to the nearest ore-landing on the haul horizon.

After working out the upper part 7 of the excavation site, the developed space is filled with collapsed rocks 6 at an angle of repose, and the remaining

Claims (1)

emptiness under the roof - by breaking the rocks of the bloodstream, for which wells 9 are blown up. Claims of the invention A method of developing powerful ore deposits, including preparatory-rifled workings, dividing the excavation section in height into lower and upper parts, end production of broken ore layers from the lower and upper parts of the site, the collapse of overlying rocks, about the fact that, in order to reduce the dilution of the ore by the collapsed rocks, first work out the entire lower part of the excavation area, while the width and height of the lower hour tee excavation area taken from the ratio  / 3, where h is the height of the lower part of the excavation area, m; I - width of the excavation area, m; / is the angle of repose of the collapsed rocks, hail, and after filling up the lower part of the excavation with the collapsed rocks plot at an angle of repose work out the upper part of the excavation site, and the testing of the lower and upper parts are from the ore mass in the direction of the collapsed rocks.