Method for high ledge cutting in confined environment
FIELD: mining, particularly excavation of hard rock in confined environment demanding prevention of blasted rock cuttings falling under high ledge slopes, namely during re-activation of temporarily unworked edges of deep pits, spacing sides of deep rock excavations in road building and so on.
SUBSTANCE: method involves separating high ledge into layers so that each layer has height not exceeding excavation equipment digging height; preparing the layers for following blasting by arranging light-weight woven mat with weight on side slope of high ledge below layer to be blasted; drilling blast-holes in each layer; filling blast-holes with charges, wherein blast-holes, which are outermost from side slope, are filled with decreased charge; arranging two-layer gas-permeable covering on all opened surfaces of area to be blasted, wherein lower end of the covering is made of metal mesh, upper one is created of mats formed of worn-out car tires; inserting lower covering part under mat for distance of not less than tire diameter; blasting rock; removing covering and excavating cut rock.
EFFECT: prevention of rock fragment dispersion under high ledge slopes during blasting works performing and rock excavation.
The invention relates to the field of mining industry, in particular to the development of strong rocks in cramped conditions, when it is necessary to exclude scatter the shattered rock mass downhill high ledges when assembled temporarily inoperative deep open pit walls, posting boards deep rock excavation in road construction, etc.
The most common way of working off high ledges in cramped conditions with the objective of reducing the scattering of broken pieces of rock at explosive crushing is set above the shattered surface of the special cover of various designs /1/. Their main disadvantages are preventing scattering of pieces only from the site of the ledge, while significant release of rock mass goes with the slope of the blasted rock ledge.
The closest essentially solved problem is a way of working off high ledges, whereby to make a separation of the high ledge on the layers, Buryats in each layer blastholes, exercise their loading, and far from the side of a slope blastholes charge reduced charge, produce blasting and subsequent seizure shattered rocks. The height of the layer when separating them do not exceed the height of the use of excavation equipment, with each layer being prepared explosive loosening the recess, why on the side slope of the high ledge at the level of the soles of exploding layer set anchors, connect them on top of the carrier link and fix it upper part of the canvas of a light wicker Mat, the bottom of which is fixed by weighting on the sole of the bottom layer, then exploding in the layer Buryats and charging blastholes, on all exposed surfaces of exploding parcel layer place the shelter, made of gas-permeable heavy chain mats to prevent scattering of pieces of the breed in the explosion, with the shelter of the side slope down under a light wicker Mat and produce an explosion layer, after the explosion of the cover shoot and produce the notch blasted rock mechanical slaughter. In preparation for the explosion of the next underlying layer of a high ledge under a light wicker Mat choose the accumulated mountain mass, freeing up space for a new work cycle, reduce its length to the height of preparing for the explosion of the layer and repeat the cycle /2/.
The disadvantage of this method is the relative scarcity and high cost of heavy chain mats.
The technical task to be solved by the invention, is the elimination of scattering rocks downhill high ledges for blasting and excavation of the rock mass.
This object is achieved in that Thu is in the way of working off high ledges in cramped conditions, whereby to produce a separation of high ledge in layers not exceeding a height of bailing excavation equipment, and training them to Bang on the side slope of a high ledge below the shattered layer of fabric lightweight woven Mat with weighting, then drill into each layer blastholes, exercise their loading, and far from the side of a slope blastholes charge reduced charge on all exposed surfaces of exploding parcel layer place the shelter, produce blasting and subsequent seizure shattered rocks of each layer after removing the cover, according to the invention on all exposed surfaces of exploding parcel layer to prevent scattering of pieces of the breed in the explosion place double-layer gas-permeable cover, the bottom layer of which is made of metal mesh, and the top of the mats, knitted from worn-out tires, while the lower part of the cover side slope down under a light wicker Mat not less than half the diameter of the tires.
1 schematically shows the implementation of the method; figure 2 - cross section A-a in figure 1.
A way of working off high ledges in cramped conditions is as follows.
High ledge on the pit road or the notch in the rocks divided by height in layers 1, not exceeding the height cher the project excavation equipment, and allow each layer to explosive loosening and seizure. First, it is prepared for extraction, which on the side slope 2 exploding layer 1 at the level of the sole 3 install anchors 4 at a distance from each other by a multiple of the size of a car tire cover, connect them on top of the carrier link 5 and secured therein the upper portion of several United side parts of the paintings of a light wicker Mat 6, made for example of polypropylene fibers. These mats are widely used in foreign practice for the shelter of the shattered sites /3/. The lower part of each canvas lightweight woven Mat 6 is fixed by weighting 7 on the sole 3 of the lower layer 1 high ledge and due to this it is spread along the entire length of the side slope 2 high ledge, adhering to it below anchors 4 closely. Created as a soft tapered bag with an open receiving hole, wherein the width of it ahead of exploding the block one or two paintings. The preparation for the excavation of the rock layer 1 is completed.
Then layer 1 amerivault explosive wells 8 and produce their charge. Far from the side of a slope blastholes 8 charge reduced charge protruding steps, in which the energy of the explosion will be sufficient to offset the rocks towards the free surface, and this offset will cover the entire thickness of rock between the charge and the surface is rnostly and will be accompanied by her split with swelling, without scatter /4/.
After charging blastholes 8 layer 1 is prepared to explode, do this on all exposed surfaces of exploding area of layer 1 - top 9, the end portion 10 and the side slope 2 place the gas-permeable cover, consisting of two layers: the lower layer 11, made for example from metal tubular mesh or worn sieves screens with the appropriate dimensions of the mesh, and the top layer 12, which represents a Mat associated from worn-out tires. It is collected at the top of layer 1 of the separate waste tires 13, the size of which the diameter is chosen based on the height of the layer 1 to the excess of Mat on the top and bottom edges of the layer passed through the junctions of the individual tires. The range of sizes of tires, heavy-duty trucks, such as BelAZ is quite wide - from 1.6 m at BelAZ-540 to 3.1 m at BelAZ-7519 . For bus connections in them crosswise install chains or ropes 14, which outputs through the tread is provided with connecting elements 15, for example, hooks and eyelets. The connection of the connecting elements 15 through a chain or rope 14 has two purposes. First, when there is loads at the moment of explosion is transferred to the chain or rope 14, balancing the deformation of the tire 13. Secondly, four times smaller rocks, which can be released through the inside of the her hole bus 13, reaching 0.6 m the tires BelAZ-540 and 1.3 m at tire BelAZ-7519. The top layer 12 of the cover is collected either immediately covered the entire width of the layer 1, or in the form of separate strips along the length of the slope is 2 and the surface layer 1, and then connect several bands after placement on the covered volume in a single shelter, using auxiliary mechanisms, such as a car rig.
Stack both layers sequentially, for example, using the crane so that the edges of the mats were located at 1.5-2 m next to the edge of exploding parcel layer. And the mats of the upper layer 12 on the side slope 2 are placed so that at least half of the tires sank into a light wicker Mat 6 in the gap between the anchors 4. For this horizontal links connecting elements 15 between the bottom tire is not set.
Under the sequential explosion of charges of loosening the main part of energy of the explosion is spent on crushing rocks and displacement of the gas-permeable cover. The elasticity of the cover when the heaving rocks from the explosion is not possible to detach the individual pieces of the total mass, the loosened rock mass tightly obhvatyvala the Mat and held them in a compact condition, and small pieces hold the bottom layer of the grid 11. The inertial resistance of a compact mass of rock, reinforced mass shelter, balances the force of the blast. A separate piece and of the rock mass from under the shelter on the side slope 2 can slide under the canvas of a light wicker Mat 6 in the gap, educated anchors 4, and gently slide under the canvas of a light wicker Mat 6 on the side slope of 2, accumulating the weighting 7. Thus due to the friction of the surfaces of a light wicker Mat 6 and the side slope 2 is excluded stepwise moving the pieces on the slope leading to their distant crash.
After the explosion of the charge exploded parts both layer 1 layer shelters and begin the notch blasted rock excavator or loader at the height of Nabal, equal to the height of the stock that will provide a significantly smaller shift of the rock mass and reduce the number of rocks, setiausaha under the canvas of a light wicker Mat 6. The direction of testing layer 1 shown in figure 1 by the arrow. After excavation of blasted rock the whole cycle of works on the blasting and excavation of the layer 1 is repeated.
In preparation for the excavation of the next, the underlying layer 1 high ledge on the sole of the high ledge to pull the weighting 7, for example, crane and pick the accumulation of the rock mass, for example, scoop loader, freeing up space under a light wicker Mat 6 for a new cycle of works. Then the upper part of the paintings of a light wicker Mat 6 is removed to a height produced by the explosion of the layer and repeat the process of fixing anchors 4 above. When blasting the bottommost layer high mouth is and shelter side slope 2 exploding layer of rocks is only mats from worn-out tires.
Thus, the inventive method of testing high ledges in cramped conditions provides layer-by-layer blasting and excavation of rocks high ledges of the end face without scatter the pieces over the cliff ledge, thereby making it possible to solve the problem.
Sources of information
1. Androsov A.D. the Development of technologies for reconstruction of deep pits of Yakutia. - Novosibirsk: Nauka, 1991. - 103 C.
2. The patent of Russian Federation № 2236588, MKI 7 IS 41/00, F42D 5/05 (prototype).
3. Averianov VI, A.A. Dobrynin Blasting operations near urban and industrial sites. Gorn. 1999, No. 11. P.78-80.
4. Gperiodic. Application of the energy principle to the calculation of borehole charges on mines. Vzryv No. 62/19. M.: Nedra. 1967. P.36-51.
5. The Handbook. Open pit mining. M: Mining Bureau, 1994. S-361.
A way of working off high ledges in cramped conditions under which to make a separation of the high ledge in layers not exceeding a height of bailing excavation equipment and training them to Bang on the side slope of a high ledge below the shattered layer of fabric lightweight woven Mat with weighting, then drill into each layer blastholes, exercise their loading, and far from the side of a slope blastholes charge reduced charge on all open top is the awns of exploding parcel layer place the shelter, produce blasting and subsequent seizure shattered rocks of each layer after removing the cover, characterized in that at all exposed surfaces of exploding parcel layer to prevent scattering of pieces of the breed in the explosion place two-layer gas-permeable cover, the bottom layer of which is made of metal mesh, and the top - mats, knitted from worn-out tires, while the lower part of the cover side slope down under a light wicker Mat not less than half the diameter of the tires.
FIELD: mining industry, in particular, mining of hard rocks in hindered conditions, when there is a necessity to preclude the spread of the blasted rock mass at re-activation of temporally idle non-mining flanks of dip open pits, blast near the complexes of the cyclic-flow production process, separation of the flasks of dip rock pits in highway engineering, etc.
SUBSTANCE: the shelter of the blasting areas by tyre mats includes the interconnected worn tyres laid on the surface to be basted bulk up in the form of a single-layer mar fastened with the aid of ropes or chains to the anchor installed in not deep holes on the surface of a bench. The automobile tyres of a single-layer mat laid on the horizontal surface to be blasted bulk up are filled with liquid, for example water.
EFFECT: enhanced ecological safety of blasting operations due to reduction of dust loading.
2 cl, 3 dwg
FIELD: mining industry, in particular, mining of hard rocks in hindered conditions when it is necessary to prevent scattering of the blasted rock mass.
SUBSTANCE: the mechanical device for long-term locking of detonation products has a cylinder with an axial cavity and a tapered expansion. The tapered expansions are made on both-ends of the cylinder and at least three slots are made in each of them. A spacer cone is inserted in the lower tapered expansion, it is coupled to a thick-walled tube freely passing through the axial duct of the tapered plug inserted in the upper tapered expansion. The tapered plug is additionally provided with a recess closed with a hinged cover and with an installation loop with a flexible coupling. The method for blasting of benches under a shelter consists in drilling of blast holes, their charging, tamping, sheltering of the bulk to be blasted, blasting of the rocks and removal of the shelter. Tamping of the holes is made by installation of mechanical devices for a long-term locking of the detonation products and their preliminary wedging in the hole. The mechanical devices for a long-term locking of the detonation products are lowered in the hole down to the required lever and installed their. The initiating pulse conductor is placed in the recess in the tapered plug of the mechanical devices and closed with the cover. After that the shelter in the form of a mat composed of inter connected automobile tires is placed on the high wall and the bench surface, and fastened by the anchors installed in shallow holes with the aid of ropes and thin chains. Part of the mat (1-2 types) should remain on the bench bottom. After that the mechanical devices for a long-term locking of the detonation products are connected to the shelter by a flexible coupling, the conductors of the initiating pulse are extracted from them, the blasting network is installed above the shelter, and the sheltered bench is blasted. After the blast the shelter is removed with the aid of a bulldozer for the ropes or chains removed from the anchors, the mechanical devices for complete locking of the detonation products are removed at the same time.
EFFECT: provided breaking of rocks without scattering of pieces to the high wall slope with a long-term locking of the detonation products in the charge cavity.
5 cl, 4 dwg
FIELD: mining industry, in particular, in mining of hard rocks in restricted condition, when it is necessary to exclude scattering of the blasted rock mass.
SUBSTANCE: the method consists in drilling of blast holes, loading of them, sheltering of the area to be blasted by mats of anchor chains and blasting of rocks. According to the invention, the method consists in drilling of blast holes, loading of them, sheltering of the area to be blasted by mats of anchor chains and blasting of rocks, after loading of the holes a horizontal chain mat is placed on the bench surface, and with the aid of a beam with flexible lugs positioned on the edge it is fastened by the anchors installed in not deep holes outside the block to be blasted, then a chain mat is placed on the side slope of the bench so that the lower edge would be laid on the bench bottom at least 2m long, and its upper edge is joined to the horizontal chain mat outside the prism of probable caving. After that the blast network is mounted over the shelter, and the sheltered bench is blasted. The claimed method of blasting of benches under a shelter provides for a rock-breaking without scattering of pieces under the bench slope.
EFFECT: enhanced safety of blasting due to prevention of scattering of rock pieces under the slope of the benches.
FIELD: safety arrangements for blasting.
SUBSTANCE: device comprises protecting shell that converts a part of the blasting energy into electric power with subsequent transmitting energy through the wire to the variator (positioned at a large distance from the shell), where electric power is converted into heat.
EFFECT: enhanced reliability.
1 cl, 1 dwg
FIELD: procedure of protection of objects against the action of shock waves in air or water medium, in particular, devices for localization of blastings.
SUBSTANCE: the device includes a protective screen, having a strong outer and a thin-walled inner shell, with a damping material placed between them, an expanded graphite is positioned between the shell as a damping material.
EFFECT: considerably enhanced damping capacity of the device, reduced specific consumption of materials and weight.
1 dwg, 1 ex
FIELD: mining, particularly open cast kimberlite pipe mining.
SUBSTANCE: method involves mining ore body by hydromining device of floating dredger; supplying diamond-containing pulp to floating dressing plant, recovering diamonds and transporting reject material from pit to preliminarily prepared plate for following utilization thereof. Ore body is developed by hydromining device reciprocation across total ore body area. Diamonds are recovered by serial pump decomposition, sizing, dressing and conditioning. Residual material is utilized by dewatering thereof in centrifuge and stacking for following usage for building material production.
EFFECT: simplified method and rig and decreased power inputs for kimberlite pipe development.
2 cl, 2 dwg
FIELD: mining, particularly for underground mining of steeply-dipping and inclined ore bodies having low and high thickness, as well as streaks.
SUBSTANCE: method involves separating stages and substeps in pit side slope; constructing deep pit with steeply-dipping side slopes in hanging and lying ore deposit walls, wherein side slope direction vary up to vertical direction at final stage; cutting zones in upper horizons and constructing the first continuous transportation path made as conveyer lifting means in trenches as pit is excavated; moving upper conveyer lifting means to new pit side point of upper stage when shifting to other mining stages at central and deep horizons and constructing conveyer system in trench located in central horizon; mounting conveyer lifting means at vertical side slope reinforced with polymers, bolts and mesh along with deep horizon excavation so that curvature of formed stable side sections correspond to surface and path of continuous ore and capping rock transportation from lower horizons to upper ones, wherein increasing shear loads in material to be transported are accommodated in conveyer structure by control of pull system and pressing means of tape drive mechanism. Device for said method realization is also disclosed.
EFFECT: increased operational efficiency, decreased costs of ore and capping rock delivery from deep pit.
2 cl, 1 ex, 10 dwg
FIELD: mining, particularly to create high dumps during open pit mineral mining.
SUBSTANCE: method involves forming preliminary dump layer near outermost deep pit outline with the use of cyclically acting means at optimal rock transportation shoulder; digging out steeply inclined semi-trench in pit side in overburden rock location zone and in direction of pit outline sections of the first, the second and the third excavation orders from depth corresponding to optimal vehicle operation height; creating embankment on surface by forming a number of transversal transport paths made as temporary dumps having heights increasing to preliminary dump mark so that embankment is at predetermined angle to preliminary dump; mounting crushing machines on main haulage level inside pit; installing in-line conveyance means in trench and in preliminary dump; covering thereof with light-weight snow-protection tent. Dumping operation is performed in parallel runs from stacking conveyor, wherein rock is received with inclined boom-mounted mechanism of plate feeding means arranged in tube-shaped structure supported by sliding supports so that the structure may rotate in place of structure connection with stacking conveyer. Boom length is selected from inclined dumped rock layer thickness to provide minimal dump settlement in unloading device installation place. Dump embankment forming for main conveyer of the second order is continued by preliminary dump forming within design dump outline by means of in-line conveyance means and by rock stacking on dump and by cyclic means. After that the second and the third dump layers are constructed. To prevent dump deformation rock layer stacked in winter is covered with snow-free buffer rock so that said layers have equal thicknesses. As central and deep pit zones are developed main conveyer is enlarged by installing new crushing equipment section on the second haulage level formed in permanent side. Conveyer path enlargement is continued with the use of steeply inclined and vertical conveyers to provide threshold distance of rock conveyance to crushing unit by collecting transport specified by optimal collecting transport operation.
EFFECT: increased dumping efficiency.
1 ex, 5 dwg
FIELD: mining, particularly safe refuse disposal during deep laying kimberlitic pipe excavation in extreme northern permafrost zone conditions.
SUBSTANCE: method involves constructing protection dam of overburden and creating water-tight screen of loamy soil; stacking waste and rock mass of different types inside protective dam; dumping rock in layers along with layer slopes and berms creation. Each protective dam layer is formed along finite outline. Water-tight screen is covered with zeolite layer to neutralize poisonous gas. Rock saturated with brine is stacked inside formed bowl in direction from layer periphery towards center thereof. As layer is filled with brine-saturated rock the layer is covered with zeolite layer. Then upper layer is formed in the same order. After all layer dumping termination slopes are treated to impart variable geometry thereto and the slopes are covered with sapropel. Dump has elliptical configuration oriented depending on wind rose.
EFFECT: increased efficiency and safety of aggressive brine-saturated rock dump stacking and storage.
1 ex, 2 tbl, 5 dwg
FIELD: mining, particularly opened development of horizontal and gently sloping mineral deposits.
SUBSTANCE: method involves cutting next to last overburden bench; providing explosion to shift rock to goaf during above cutting operation; forming road over shifted rock; performing transportation of rock cut from next to last bench; transporting rock remaining after explosion out of ore body outline along with rock bench slope cleaning and ore body roof cleaning; removing remaining cone with bulldozer; digging-out pit along contact line between ore and shifted rock; mining mineral and transporting thereof along temporary ore-transportation road formed over shifted rock pile.
EFFECT: increased efficiency of deposit development, increased discharge coefficient, decreased distance of next to last bench and mineral rock transportation.
7 cl, 2 dwg
FIELD: mining industry, possible use during open combined excavation of bed deposits with two coal formations with alternating extraction of formations and parting and technology of stripping operations based on transporting and non-transporting excavation system.
SUBSTANCE: in accordance to invention, at predetermined sections usable for processing parting in accordance to transport-less dragline technology, special dumping vessels are created and moved for required value towards excavated space, meant later for excavation of parting rocks into them. Volumes and amount of these vessels is determined depending on mining conditions and parameters of stripping equipment. Therefore, a part of volumes of transport stripping is redistributed to non-transport stripping.
EFFECT: lower costs of stripping operations and less harmful blowouts into atmosphere from vehicle transport.
1 ex, 1 tbl, 1 dwg
FIELD: mining industry, in particular, technology for extracting mineral resource deposits, possible use for extracting ores of balance and over-balance resources during extraction of mineral resources.
SUBSTANCE: method includes preparing the massif, supplying reagents, draining solutions, sedimentation of useful components. Ore sections of useful components are detected in massif beyond limits of pit contour above the level of depression cone. These massif portions in pit sides are subjected to explosive crushing, well is drilled to upper area of each prepared ore section, and then lixiviation solutions with reagents are fed into the well. Solutions, self-flowing downwards along ore section, lixiviate metal and then enter common flow of underground waters, formed by depression cone. Sedimentation of metal is performed in the pit on geo-chemical barrier, in place of common exit of subterranean waters.
EFFECT: ensured fullness of extraction and high efficiency when completing a formation in accordance to open method.
3 cl, 2 dwg
FIELD: mining industry, possible use mainly during extraction of argillaceous placers by open method.
SUBSTANCE: method includes mechanical shrinkage of mass and extraction of sands using digging-transporting equipment. Shrinkage of mass is performed with creation of crowns, and extraction of sands is performed by cutting off aforementioned crowns.
EFFECT: increased recovery of useful components from argillaceous sands of mass, containing large pieces.
4 cl, 8 dwg
FIELD: mining, particularly opencast mining of mineral deposits in the case of limited vertical ore bodies, for instance kimberlite pipes.
SUBSTANCE: method involves forming pit sides having inclinations less than minimal possible ones to provide pit side stability; preparing rock for further excavation by drilling-and-blasting operations; transporting ore and overburden via main incline by wheeled vehicle; forming transfer point plate at the second stage; excavating up to design depth along with forming pit sides having maximal possible inclinations, which provide pit side stability; cutting main incline from transfer point plate, wherein inclination thereof is increased in longitudinal direction; cutting ore pillars of the first stage; forming pit side having high ledges; forming lower ledge along ore body outline; forming temporary incline in one pit part; transporting ore and overburden to transfer point plate by means of caterpillar vehicle; forming temporary incline to provide pit cutting to design depth and cutting ore pillars under temporary incline.
EFFECT: increased efficiency of deposit excavation due to reduced overburden volume within the bounds of deep limited pits.
3 cl, 1 ex, 1 tbl, 4 dwg
FIELD: mining, particularly opencast mineral mining.
SUBSTANCE: method involves stepping rock up to design outline with leading in the first stage pit edge; transporting ore along main decline to plant and stacking overburden in dump; excavating connection entry between the first stage pit and the second stage pit so that the entry is opened in previously excavated the first stage pit; cutting the second stage pit; transporting ore and overburden from the second order pit via connection entry; depositing overburden from the second order pit in the first stage pit goaf after termination of the first stage pit excavation. Before ore and overburden transportation from second order pit via connection entry overburden excavated from the second order pit is accumulated in outer dump. Overburden from the second order pit is conveyed to day surface along temporary decline system. When the second pit side reaches designed outermost outline temporary declines are killed.
EFFECT: reduced costs of deposit development and decreased hazardous action of mining operations on environment.
4 cl, 4 dwg, 2 tbl, 2 ex
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