Method of making steep trench
SUBSTANCE: method comprises making a steep trench using a wheel loader and motor transport, capable to climb steep slopes. Making the trench is carried out in several stages, dividing the steep trench to steeply inclined-horizontal layers with height calculated by taking into account the motion trajectory of the loader bucket, which are mined successively downward. When mining each successive layer the rock mass is preliminary loosened, the loader carries out its withdrawal, delivery and unloading to the motor transport placed at horizontal areas as close as possible to the forehead.
EFFECT: improving efficiency of mining.
The invention relates to mining and can be used at the opening of the deep horizons career.
There is a method of forming an inclined transport of the trench on the blasted rock mass mechanical shovel with bottom loading into dump trucks (B. C. Khokhryakov. Open development of mineral deposits. - M.: Nedra, 1991, S. 37).
The disadvantage of this method is the inability to use excavators with sinking steep trenches as technical characteristics for shovel crawler excavators made during excavation of the slope of the working platform should not exceed 3°, and the longitudinal slope steeply congresses ranges from 12° to 15° .
There is also known a method of conducting a steep trench exposing the horizon with limited space for trucks, can overcome the steep slope (Patent 2376471 of the Russian Federation, IPC E21C 41/26 Way for steep trench // Appl. 30.04.2008, publ. 20.12.2009, bull. No. 35).
The method includes holding a temporary trench at an angle of 5-6° to reveal horizon overlying horizon on the loosened rock mass. At the end of this trench to form a horizontal platform, which extend, actuating the rock mass initially under part of the Foundation of the temporary trench, and forming part of the Foundation trenches on steep width. This mountain mA is su transported through the remainder of the Foundation of the temporary trench. Then fire the rock mass under the remaining part of the Foundation of the temporary trench and forming another part of the base of the steep trench along its width, transporting the rock mass already formed part of the base of the steep trench.
However, this method cannot be used when conducting a steep trench exposing the horizon with limited space for trucks, capable of overcoming the bias of 12-15°, as required when performing steep trenches complete large volumes of work and open spaces associated with pre-construction and placement of the temporary trench with a slope of 3°, and the increased distance transportation of rock mass in the course of time and then a steep trench. The application of this method is limited by the width of the bottom of the quarry, at least 100-120 m
The known method of forming a steeply Congress (Patent 2425220 of the Russian Federation, IPC E21C 41/26 Method of forming a steeply Congress / Appl. 10.02.2010, publ. 27.07.2011, bull. No. 21).
The method involves the blasting of the rock, the driving time of the inclined trench width with a horizontal platform at its base, the testing of blasted rock wedge-shaped benches, starting from the bottom, with the use of an excavator, in one half of the inclined trench from worked-out areas is. In the second half of the trench perform transportation of rock mass on the surface of the upper section work with a bulldozer, transported the rock mass at the bottom of the lower zagadki, form the plot of a steeply Congress. Work similarly to the second half of the inclined trench, transporting the rock mass on an already formed stretch of steeply Congress, reduce the width of the sections of the Congress to project and form the lower part of the slope steeply Congress on project marks.
The disadvantage of this method is that it is in widespread height of the ledge 15 m may only be used when the length of the horizon of not less than 200-250 m
The aim of the invention is to increase the efficiency of field development due to a steep trench exposing the horizon with limited space, with a minimum amount of work for dump trucks, can overcome the steep slope, with a full excavation of minerals in the career without additional spacing flanges and haulage from the trench to the surface.
The objective is achieved in that the holding steep trenches for vehicles that are able to overcome steep gradients, carried out using a wheel loader in several stages, dividing the steep trench on crotonylene-horizon is further layers, height is determined based on the trajectory of the bucket loader, which work sequentially from top to bottom, when developing each layer of the rock mass pre loosen, the truck makes its recess, delivery and unloading in road transport, set to as close as possible to the bottom horizontal platforms.
This set of essential features of the proposed method will reduce the amount of work and time to conduct steep trenches, to reduce the number of employed equipment, to reduce the distance of transportation of rock excavated when conducting a steep trench, to reduce the size of the bottom and to increase the depth of the quarry without additional spacing of the boards.
The method is illustrated graphically, where Fig.1 depicts the launch of the steep trench, which consists in working out the loosened rock mass steeply inclined part of the upper crotonylene-horizontal layer with the use of wheel loader with overload in automobile transport means located on the nearest horizontal surface formed outside the trench. In Fig.2 shows the position when the truck was shipped volumes steeply inclined part of the upper layer and moved along the horizontal part at a distance, providing the possibility is of aesd road transport for loading directly on the horizontal area of the upper horizontal layer.
The method is as follows.
Conducting a steep trench is performed using a wheel loader 1 and road transport 2 (Fig.1). For this steep trench 3 is divided into crotonylene-horizontal layers 4, at the entrance having a steeply inclined sections 5, which are the surface formed by the steep trench. The height of the layer is taken with regard to the trajectory of the bucket loader. Development of the layers is made from the top down with the preliminary loosening of the next working layer. In early testing of each layer, when the loader runs on the slope road transport have on the nearest horizontal surface 6 outside formed a steep trench. After working steeply inclined portion of the layer when the loader to work its horizontal part, created a horizontal platform 7, sufficient to accommodate road transport (Fig.2), the last one to put the history of this site. Similarly, work out all other layers. When developing a steeply plots crotonylene-horizontal layers of road transport pose a loading outside formed a steep trench, when in the next working layer of the horizontal section of sufficient length road transport cast on is Rusko closer to the truck. The rock mass from the trench is removed to the surface.
The use of the proposed method to form a steep trench exposing the horizon with limited space for trucks, can overcome the steep slope, for example, with articulated, full excavation of minerals in the career without additional spacing flanges and haulage from the trench to the surface.
Sources of information
1. RF patent №2376471.
2. RF patent №2425220.
3. Khokhryakov B. C. Open development of mineral deposits. - M.: Nedra, 1991, S. 37 (prototype).
Way cool trench for motor vehicles, is able to overcome steep gradients, characterized in that the trench is performed using a wheel loader in several stages, dividing the steep trench on crotonylene-horizontal layers with a height that is determined based on the trajectory of the bucket loader, which work sequentially from top to bottom, when developing each layer of the rock mass pre loosen, the truck makes its recess, delivery and unloading in road transport, set to as close as possible to the bottom horizontal platforms.
SUBSTANCE: method comprises formation of the working area, the technology of mining of overburden benches and ensuring of load-transport communication of working horizons with the surface, mining of the overburden benches of the working area is carried out with excavators with elongated work equipment, taking the height of the benches equal to a sesquialteral height of digging of the excavators. At that, to prevent the collapse of deflectors and hangers on the bench slope above the height of the excavator digging the pre-splitting of its upper part is made by a) contour blasting or b) preliminary slit-formation, formation of the working area is carried out with the use of a cascade scheme of mining of overburden benches, at that the scope of work of each bench is divided to the passive with minimal working areas with a width that provides two-way movement of technology vehicles and its manoeuvring, and an active, working platforms of which include minimum working platforms, and volumes of overburden rocks ready for extraction, the relative length of active edge of each overburden bench is determined by the mathematical formula. Blasting of volumes of overburden rocks ready for extraction of the bench is carried out from the calculation for the entire blasted amount can not be completely placed on the working platform of this bench and on the minimal working platform of the underlying bench adjacent to it, opening the working benches is carried out by steep sliding ramps with longitudinal slope to 12-15° with the condition of use of vehicles that can overcome such slope, and the width providing location of collapse of blasted rock mass during their expansion and simultaneously through pass of process of technology vehicles, the expansion of steep ramps is carried out using track and wheel loaders by dividing the collapse of the blasted rock mass to the horizontal and inclined layers with height determined by taking into account the path of movement of the loader bucket.
EFFECT: reduction of current stripping ratio in the initial period of development of the deposit.
SUBSTANCE: method comprises the identification of operational field, mineral objects of extraction, inside them - operational blocks with standard, temporarily sub-standard and substandard and sub-standard mineral resources and separation of rocky ones, outstripping, current and realtime automated obtaining of express information, digging of uncovering "wells" or short trenches. The roboting automated extraction of a mineral from formations during their extraction using a mechanical method of separation of minerals and rocks of thin rocky interlayers, automated lifting of a mineral to the daylight area or its bypass to the receiving device arranged in an adit. At excavation of fields of upland type, a rock mass is left in a goaf after excavation of interlayers, the face area is temporarily kept using the automated and roboting ready-made fastening.
EFFECT: improvement of performance of development of non-rocky sheet deposits with medium and steep pitch.
SUBSTANCE: method includes the automated and real-time obtaining and processing of the express information on the structure of array of consistently worked-out parts of ledges, their differentiated separation on the basis of the obtained complex system information into multi-scale structural elements of rocks with natural and technogenic fracturing. Separation of the obtained complex system information into multi-scale structural elements of rocks includes strength, elasto-rheological, thermophysical, structural and mechanical characteristics. The automated combined destruction down of structural members comprises the blasting under a mobile engine driven shelter and subsequent disintegration using an electrophysical method in view of the obtained characteristics. Direct accommodation in temporary storage stockpiles and delivery of the obtained products to consumers is performed after the automated feeding of mined rock into a receiving device of the mobile sorting unit with the subsequent separation of mined rock into respective fractions by coarseness.
EFFECT: improvement of performance of development of fields of building rocks of rocky and semi-rocky types.
SUBSTANCE: invention relates to the mining industry and can be used in development of large deposits of commercial minerals of hollow and tilting occurrence with use of the technique of continuous action with the open-pit mining. The method comprises permanent and initial trenching, mounting of transportation lines, excavation of commercial minerals by mining with wedged stopes. The mining with wedged stopes is carried out from the maximum width of excavation stope to the stope width BTi, which enables movement of transportation lines to the next wedged stope in accordance with the condition:
EFFECT: increase in productivity of excavation and loading complex in mining of deposits of commercial minerals by fan-mining method.
SUBSTANCE: invention relates to the mining industry and can be used mainly for loading the rock mass in the dump trucks in the implementation of continuous operation of miners. The method comprises implementation of independent processes of positioning hoppers, which occurs simultaneously with the working process of the miner in the automation of the process of orientation of the complex for loading relative to the miner, and the dump truck - relative to the complex. Implementation of independent processes of location of the hoppers is carried out by moving the frames of the hoppers in a vertical plane and the hopper carriages - in the horizontal plane and is controlled by the vertical movement mechanism and horizontal movement mechanism. At that the hoppers by means of articulated linkages with carriages are pivotable in a vertical plane by means of telescopic mechanisms of rotation. The hopper frames when moving interact by sliding bearings with vertical guides. The complex is equipped with vertical guides of the frame of the modules, which interact with the sliding bearings of the frames of the hoppers, the mechanisms of vertical movement connected with sliding bearings, the mechanisms of horizontal movement, mounted on the frames of the hoppers and connected to the hopper carriages for positioning the hoppers in the horizontal plane, and telescopic mechanisms of rotation of the hoppers in a vertical plane relative to the hinge connections, the system of automatic control of mechanisms of the complex functioning. The complex also is equipped with positioning sensors mounted on the frame of the complex and connected to the automatic control system, and to control loading the hoppers with rock mass on the bottoms of the hoppers the control sensors are placed. At that the automatic control system comprises a microprocessor with a control unit, a control panel of hydraulic system and electric generator.
EFFECT: improvement of the process efficiency of the complex operation for loading of the rock mass in the dump trucks.
2 cl, 2 dwg
SUBSTANCE: method in which the quarry along the length is divided by the lines, of which the first is worked out to a target depth with an external spoil disposal and working out of the subsequent ones is carried out using an internal spoil disposal, placing the overburden in the mined-out space of the adjacent line with the common formation of the dump tiers with the development of mining work. And simultaneously with the start of mining operations in the quarry of the first stage within the quarry of the second stage along the deposits the front quarry is built with angles of the slopes of sides close to the angles of reclamation, the cross-overs are located in it for providing cargo communication of the upper working horizons of the quarry of the first stage with the surface, with the reduction of mining operations in the quarry of the first stage on its longitudinal side the loop cross-overs are made adjacent to the bottom of the quarry in the area of the end side, which is formed with a slope towards the temporary side, marking the limit of the quarries of first and second stage, when achievement in the mining operations in the quarry of the first stage of the current depth. The separation of the sides of the front quarry is carried out, turning them into working, and after complete working out the reserves of the quarry of the first stage the working out the reserves of the quarry of the second stage is carried out, while linking its main openings to the main openings of quarry of the first stage in the locations of the loops, the inner dump in the worked-out area of quarry of the first stage is formed as inclined and horizontal tiers, at first directly with the surface from the side not occupied with main openings, the inclined tier is made with bulldozers with width of the platform on top equal to zero, and then using a draglines it is extended by the amount of boom extension, after this the horizontal tiers are dumped in series from the bottom up from the loop cross-overs with the high ensuring their sustainability, to complete formation of the inner dump.
EFFECT: decrease in the distance of inner transportation of overburden from the working area to the inner dump.
SUBSTANCE: method comprises formation of the working area, technology of mining overburden benches and providing cargo communication of the working horizons to the surface, the overburden benches of the working area are taken of the increased height (25-30 m), based on the condition of their mining using excavators with extended working equipment, the benches are combined into groups of three in each. At that for the upper and lower benches in the groups the minimum working areas are provided with dimensions equal to the width of the transport platforms, providing two-way traffic of technology vehicles and its manoeuvring, for the middle benches the width of the platforms is taken equal to the sum of the width of minimum working area and the width of the recess stope with ready-to-dig volumes of overburden, providing the necessary speed of reduction of mining operations in each group of overburden benches of the working area during the formation of the breakdown of the blasted rock mass based on conditions of placing it on the middle and lower benches. And the breakdown of the rock remaining on the middle benches, is divided into two layers, the upper of which are worked out with excavators with top loading into vehicles that are on the platforms of upper benches, the volumes of the lower layers and volumes of the overburden dumped with explosion on the lower benches are worked out with individual excavators with loading to vehicles at the same level with them. After working out the ready for excavation volumes of overburden in all groups of benches and formation of the corresponding volumes on the adjacent underlying benches and displacement of the boundary of the groups occurring at that down by one bench, their working out is repeated in the above procedure, opening the overburden benches of the working area of is carried out using steep sliding cross-overs with the longitudinal slope of 12-15° and width, providing placement of the breakdown of the blasted rock mass during their extension and at the same time the through passage of the technological transport, the extension of steep cross-overs is carried out using track and wheel loaders by dividing the breakdown of the blasted rock mass to the horizontal and inclined layers with the height defined taking into account the trajectory of motion of the loader bucket.
EFFECT: reduction of current stripping ratio in the initial period of working out of the field.
SUBSTANCE: control method comprises control of the intensity of the high temperature thermodynamic laser irradiation to the area of the laser radiation, regulation of change of the wavefront of the laser radiation, control of milling cutting force P, the parameters of the rock material rigidity f through the registration sensor of the rock material rigidity, mounted on the frame of fibre optic laser emitter, the speed control of movement of the surface miner Vki, introduction to program of algorithm of calculation of the wavefront of laser radiation power W, depending on the parameters of rock material rigidity f and the approach increment of fibre optic emitters li based on the equation.
EFFECT: invention enables to improve the efficiency of management of technological preparation for excavation of rock material and provides remote control of destruction of rock material.
2 cl, 10 dwg
SUBSTANCE: invention relates to the mining industry and can be used in open development of mineral deposits. The method comprises opening the deposit and recovery of mineral deposits with ledges with formation of the inclined surfaces of slopes and pit edges, drilling wells, loading of wells with explosives, breaking of the rock mass with blasting of explosives in units, distributed on the pit ledges, loading and transportation of the rock mass to the sites of its storage or further processing. The location sites and size of rock blocks are determined, hovering on the slopes of the ledges. From the earth's surface or upstream sites of ledges the workers and drilling equipment is descended on the lifelines to the upper surface of the hovering rock block. In the hovering rock block the wells are drilled with the distance between the wells not exceeding the maximum distance equal to the twice depth of distribution in the rock mass in the vicinity of the well of area of the rock destruction that occurs when blasting explosives in the well. The wells are drilled parallel to the surface of the slope of the ledge, and the distance between the wells and the surface of the slope of the ledge is taken as equal to the depth of distribution in the rock mass in the vicinity of the well of area of the rock destruction that occurs when blasting explosives in the well.
EFFECT: improving the safety of open mining operations.
SUBSTANCE: method is performed using the automated system which comprises a laser device with the possibility of longitudinal displacement and is provided with a damper platform placed on the surface miner frame and pivotally connected to the frame of the laser device. The laser device is placed on the frame guides with the ability to move longitudinally along the guides on the rolling bearings using the drive connected with the automatic control unit, and is made in the form of a cassette with fibre-optic emitters placed along the moving direction of the surface miner.
EFFECT: improved technological efficiency due to forming in the surface layer of the processed areas of zones with overlapping of laser slots, providing high concentration of stresses, alternating loads and deformation during laser processing of significant surface; performance improvement of process of destruction, disintegration and decrease in the volume of fraction requiring additional subsequent crushing due to combining the process of cutting slits and layers-strip cutting of rock materials by surface miners, and providing environmental safety.
2 cl, 5 dwg
FIELD: mining art, in particular, open-pit mining of mineral resources by high benches.
SUBSTANCE: large-diameter single holes are replaced by a pair of divergent holes of a smaller diameter, in which one hole is always vertical, and the other one is inclined towards the bench; the single holes of the larger diameter are replaced with a pair of divergent bundles of parallel converged holes, in which one bundle is vertical, and the other is inclined towards the bench; the single holes of the larger diameter are replaced with a pair of divergent holes of a smaller diameter, in which one hole is vertical, and the other is inclined towards the bench and positioned in the vertical plane parallel with the first one and distant from it by 1-2 hole diameters; the single holes of the larger diameter are replaced by a pair of divergent bundles of parallel converging holes, in which one bundle is vertical, and the other is inclined towards the bench and positioned in the vertical plane parallel with the first one and distant from it by 1-2 hole diameters.
EFFECT: enhanced efficiency of blasting of the benches.
7 cl, 6 dwg
FIELD: mining industry.
SUBSTANCE: method includes dividing quarry on rows, of which first one is extracted to planned depth with external dump-forming, and extraction of following rows is performed with use of internal dump-forming, placing dug rocks to extracted space of adjacent row with common displacement of dump front with development of mining operations. Second and following rows of quarry are divided on basis of height on extraction levels, extraction of uppermost level is performed with placement of dug rocks in upper dump level of extracted space of adjacent row, using surface transporting communication lines, and during extraction of second extractive level dumping of dump level of inner dump is primarily performed by forming pioneer dump at longitudinal processed edge of quarry, on upper area of which transporting lines are placed and dumping of dump level is performed from there, with descent of mining operations in working area of extractive level profile of upper dump area is altered to provided necessary cargo communications of working horizons of extractive level to dump level, after extraction of extractive level remaining pioneer dump is dug to upper mark of following extractive level, and extraction of following extractive levels is performed analogically, using reformed upper area of pioneer dump.
EFFECT: higher efficiency.
FIELD: mining industry.
SUBSTANCE: method includes cutting steps with varying angles. Angles of double step slopes, different on basis of quarry depth, are formed with consideration of decrease of irregularity parameters with deposit depth, with natural block level of upper horizons and influence from mass explosions and wind erosion of rocks with gradual increase of their steepness until forming of vertical slopes of double steps during additional operations in quarry, while angles of slopes and edge portions on upper horizons in highly fractured rocks may be 50-55°, in rocks of average and non-specific fracture levels - 70-60° and in low-fractured rocks may be 80-85°, and edge portions 60-90 m high in deep portion of quarry with vertical double steps and preventive berms 10 m have slant angle 80-85°.
EFFECT: higher efficiency.
6 dwg, 1 tbl, 1 ex
FIELD: mining industry.
SUBSTANCE: method includes extraction of quarry to planned depth with use of quarry ore chutes with accumulating bunkers, cutting ore chutes with deepening of mining in quarry, crushing ore blocks and pieces from face from bunker walls by explosives, loading ore to railway vehicles, cutting and shutting upper portion of ore chutes at each level when mining approaches there is performed by division on beds and semi-shelves with charges in wells, providing for crushing of rock to needed dimensions and safety of mine walls, and further decrease of pieces size and increasing efficiency of ore chute operation by excluding ore suspension is achieved by use of crushing assembly in form of bowl with plate at base, working as anvil under layer of rock, from where ore mass is self-propelled to bunker, and from there by feeder is sent to crusher and further through intermediate conveyer to main conveyer.
EFFECT: higher efficiency.
4 dwg, 1 ex
FIELD: mining industry.
SUBSTANCE: method includes extracting quarry to planned depth by ore and rocks extraction by displacement of shelves along horizons with transferring to crushing plants, crushing rocks and then delivering them by lifting device to the surface, during extraction of quarry to planned depth at first stage during construction of board at the end of quarry in zone of decrease of power of deposit in stable rocks conveyer rope system is constructed, connected to hoisting machine, to bed with recesses, allowing to raise crushed material to large height at steep angle and with deepening of mining and displacement of crushers to lower horizons conveyer system is extended to provide for optimal transport shoulder for gathering vehicles.
EFFECT: higher efficiency, higher productiveness.
2 cl, 6 dwg, 1 ex
FIELD: mining industry.
SUBSTANCE: method includes opening deposit of mineral resource along its length, extraction of opened rocks in shelves, forming on one of the portions of deposit of forward extracted space reaching planned bottom, moving rocks to external dumps and into extracted space, processing and transporting of mineral resource. Deposit extraction is performed in two directions - perpendicularly to length of deposit with deepening and along length to quarry bottom, while volume of extraction of mineral resource along length is increased and volume of extraction of resources perpendicularly to length is proportionally decreased.
EFFECT: higher efficiency.
2 cl, 3 dwg
FIELD: mining industry.
SUBSTANCE: method includes serial extraction of drifts with placement of opened rocks of drifts in extracted space of previous drifts, continuous combined processes of softening, extraction and movement of rock to dump. Drifts are positioned along cut trench, extraction is performed by adjacent horizontal shavings of face area, rock of each drift is moved by throwing directly to extracted space and compacted in range by realization of kinetic energy of rock.
EFFECT: higher efficiency.
FIELD: mining industry, applicable for slanting of high benches at development of magmatic deposits of mineral resources by open pit.
SUBSTANCE: the method includes drilling of contour holes for formation of a screening peephole, buffer and breaking holes to a depth corresponding to the height of one working subbench with a redrill, the middle row of breaking holes is made with an incomplete drill, charging of the openings and their blasting, dispatch of the rock, after blasting first of outline openings, for formation of the screening peephole, and then of breaking holes and mucking of the rock, similar operations are performed on the underlying subbench of the lower high bench, at the development of the lower high bench, the development of the upper and lower benches is conducted by doubling of the working subbenches, at the development of the lower subbench of the upper high bench the outline openings are drilled to the whole height of the doubled bench, the buffer openings are drilled at a distance of 12 to 13 diameters of the charge from the outline openings and to a depth at least corresponding to the height of one working subbench with a redrill equal to 6-8 diameters of the charge, the first and last rows of the breaking holes are drilled with a redrill, equal to 4-5 diameters of the charge, and the incomplete drill of the middle row of the breaking holes makes up 7-8 diameters of the charge, after blasting of the buffer and breaking opening and mucking of the rock a crest is formed, from whose surface on the side of the slope outline and buffer openings are drilled, the first ones - to the height of doubled subbenches, and the second ones - to the height at least of one lower working subbench, then the breaking openings to the same height as in the above - and underlying subbenches and for production of a natural protective bank on the upper section of the lower high bench in the section of the berm the formed ridge is liquidated by drilling, charging and blasting of the openings of small diameter and depth.
EFFECT: enhanced stability of high benches on the outline of the open pit.
2 cl, 3 dwg, 1 ex
FIELD: mining industry.
SUBSTANCE: method includes opening deposit at distance 150 meters from river and forming of natural filtering wall between river and trench, pumping of water from trench into river, extraction of mineral resource, revegetation of dumps, filling of trench with water, accomplishment of formed water body. Mineral resource is extracted from two serially opened trenches - auxiliary, revegetated as water body, and main, positioned at opposite side of river, and soil from opening of which is used for revegetation of auxiliary trench, while in main trench along whole board on the side of river right beyond mining operations inner dump is formed with width not less than 250 meters and with height at same level with earth surface, water from trenches is fed into river, and then into water body through intermediate collectors, while after forming of water body currents of soil waters between trenches and river are made balanced, balance level is estimated on basis of water levels in auxiliary trench and river.
EFFECT: higher efficiency.
1 dwg, 1 ex
FIELD: mining industry.
SUBSTANCE: method includes extraction of quarry to planned depth in stages with construction f boards with parameters, allowed from stability condition, shutting boards, finishing mineral resource massif. Building and shutting of temporary boards during extraction of steep layers of next level after change of order of extraction of opening and ore zones is started after construction and spacing in center of cut of well-like mine with vertical shelves, with parameters, which are provided for by minimal radiuses of rounded edges enough for movement of rock via spiral chutes to surface to outer dumps, with narrowing space towards bottom at level of opened level of deep portion of deposit with lesser total coefficient of opening of stage and finally board is constructed by steep vertical shelves in deep zone.
EFFECT: higher efficiency.
1 ex, 10 dwg