Method of opened development of long steep dipping fields with internal dumping
FIELD: oil and gas industry.
SUBSTANCE: invention relates to open development of mineral fields, more exactly to open development of the long steep dipping fields with internal dumping. Method when borrow pit length is divided to turns, from them first turn is developed to design depth with external dumping, and second turn is developed using internal dumping, locating overburden to the developed space of the first turn with common formation of the dumping tiers with progress of mining towards end through full depth. At that the work zone through height is divided to two parts, bottom part opening and development are performed by longitudinal inclined layers with lifting 20-25% towards end using the wheel loaders and vehicles able to move over these steep grades, height of the bottom part is determined as per mathematical equation. The top part of the work zone is developed using the transverse development system and sliding access tracks, their width is accepted based on the condition of their use for dumping of the exploded rocks upon their widening and simultaneous assurance of two-way passage of vehicles ensuring the cargo movement between the bottom and top shelves, the longitudinal inclined layers of the bottom part of the work zone are developed by separate formed in series from top to bottom near-vertical-horizontal layers with maximum height, determined considering trajectory of the loader bucket movement, during development of each successive near-vertical-horizontal layer the rocks are preliminary loosened, the loader excavates it and loaded in vehicles located at horizontal sites at minimum distance to the mine working.
EFFECT: technical result is decreased additional sides spacing to arrange the opening mine working, and reduced distance of overburden transportation from the work zone of the borrow pit to the internal dumping.
The invention relates to the open development of mineral deposits, and more specifically to the open source development steeply dipping deposits large extent with the use of internal dumping.
The known method  open pit mining of steeply dipping deposits large extent with the use of internal dumping which career field is divided by the length of the queue. While primarily being developed to full depth with hauling waste rock to the external dumps. Opening of first stage capital is mixed trenches laying two or three of the upper horizon are opened trenches external foundations and the lower horizons of the inner trenches of pledging. After the first phase included an adjacent turn adjacent to the mined-out space of the first stage. The second stage is fulfilled with the removal of overburden in the mined-out space of the first stage. The autopsy of working horizons and their cargo with the surface and internal tiers of the blade are carried out through capital tranches internal initiation that have redeemable on the longitudinal outside of the pit walls.
However, this method has significant drawbacks. The main disadvantage is the significant volumes VN�trickery transport overburden. They are due to the fact that overburden upper horizons career of the second stage are carried at the lower horizons of the career of the first stage, and overburden lower horizons career of the second stage are placed at the upper levels of the quarry.
The closest technical solution is a method development steeply dipping deposits queues with application of internal dumping . Mining in this method, starting with the construction pit of the first stage to the full depth with the movement of tailings in an external tailings. After you create the career of the first phase the second phase of work is to conduct operations in the career of the second stage. Mining operations begin to develop in the direction of the end face along the entire depth. In clearing the goaf create an inner blade, which develop after podvigina ledges of the working side. This blade is further placed overburden. Transportation of the mineral and overburden in the system with internal stacking produce by road. Cargo working relationship of the Board with tiers carry out internal dump on transport berms located on one of the longitudinal outside of the pit. On the same side of the arrange internal polytac�earnie congresses for delivery to the surface of mineral. In the case where the height of the depleted layer exceeds the height of the ledge, these conventions also serve to cargo connection working with tiered ledges internal dump. Prestaciones congresses due to the fact that as the heading scope of work conventions flooded with internal piles. Therefore, to transport non-working Board to replace retiring create new semi-permanent conferences. The semi-permanent lifespan of congresses at various horizons varies: at the upper levels of new congresses create through 1-1,5 years, on lower for 6 to 8 months.
However, due to the large additional volume of Stripping operations on the device major openings, this method does not find application in the development of steeply dipping deposits. Its scope is limited to relatively shallow conditions of occurrence of the mineral, when the angle of incidence equal to or less than the angle of repayment transport a pit, or when a constructive angle side more angle on the stability conditions.
The invention solves the problem of reducing the volume of the additional spacing of the boards to accommodate access roadways by reducing the number of horizontal transport berms connecting the working area of the quarry with the inner blade, and complete exclusion periodically renewable polos�ationary congresses, providing freight transportation working relationship with the surface horizons, and the invention solves the problem of reducing the distance of transportation of overburden from the working zone of the inner blade as a result of approach of working ledges to the discharge of dump sites tiers.
The technical result is obtained by the fact that the working careers of the second stage is divided in height into two parts, opening and development of the lower part is produced by inclined layers with the rise of 20-25% towards the end with the help of wheel loaders and motor vehicles, are able to overcome these steep slopes, the height of the lower part is defined by the expression
where BTr- the width of the transport platform, m; hI- the height of the working of the ledge, m; i is the gradient of the access roadways, the share of units; Wd- the width of the bottom of the quarry, M.
Working off the top of the working area is made with the use of the cross development system and sliding congresses, the width of which take on the basis of conditions on the collapse of rock exploded when they expand and simultaneously provide two-way passage of vehicles, providing freight transportation link between lower - and upper ledges, testing of longitudinal inclined strata of the lower part of the working area are hotelnapaspavalley formed from the top down crotonylene-horizontal layers with a maximum height, based on the trajectory and movement of the loader bucket, when performing each of the next crotonylene-horizontal layer of rock mass pre-loosen, the loader produces its excavation and loading to road transport, mounted as close as possible to the bottom horizontal platforms.
The method is illustrated by drawings, where Fig.1 and 2 shows the position of mining operations in the claimed method at the start of the tryout regular oblique longitudinal layer in the lower part of the working area of the quarry of the second line.
The claimed method is as follows. Along the length of the quarry is divided into two stages. The open pit mining of the first stage to produce with the placement of overburden in the external dumps. After you create the career of the first phase the second phase of works - maintenance works in the career of the second stage. Mining operations begin to develop in the direction of the end face 1 simultaneously throughout the depth.
In clearing the goaf create an inner blade 2, which develop after podvigina ledges desktop Board 3. The working area of the quarry is divided by depth into two parts - the lower 4 and upper 5. The height of the bottom part 4 is determined by the condition:
where BTr- the width of the transport platform, m; hI- at the height of the working�stupid m; i - slope access roadways, the share of units; Wd- the width of the bottom of the quarry, M.
The testing of the upper part 6 of the working area is made with the use of the cross development system General podvigina front of mining in the longitudinal direction. As for the opening of working horizons and ensuring freight link with the surface and internal tiers of blade use moving congresses 6. Their width is taken from the condition of placement of the collapse of rock exploded when moved while achieving freight links between upstream and downstream ledges.
Stripping and mining of the ledges of the lower part 5 of the working area produce inclined longitudinal layers 7 with the rise of 20-25% in the direction of the end face on the basis of application for excavation and loading works and transport wheel loaders 8 and motor 9, is able to overcome these steep grades.
To create the most favourable conditions for the use of mining and loading equipment and transport equipment during the mining of inclined layers produce its mining stages, by applying crotonylene-horizontal layers 10. To this end an inclined longitudinal layer break 7 in height on plots 11. Within the site with the use of a wheel loader conduct steep trench 12 with the base corresponding to the base� inclined layer 7, which when reaching the lower border of the plot becomes horizontal. After the trench is produced development of the whole area, opened crotonylene-horizontal trench. While loading excavated rock mass in vehicles produced on horizontal platforms 13 to closely match to the face.
The height of sections 11 accept from the condition that the height of the slaughter at any time of conducting the work does not exceed the allowable height under the terms of the safe operation of the forklift.
As working off of another site 11 this operation is repeated in a similar manner until, until you worked out the whole of the inclined longitudinal layer 7. Overburden is transported in the internal tiers of blade transport berms 14.
The inventive method provides in comparison with the prototype of a multiple reduction of the amount of additional spacing of the boards due to the complete replacement of semi-permanent ramps inclined longitudinal layers and the elimination of transport berms, connecting workers ledges with these semi-permanent ramps.
Sources of information
1. Copyright certificate of the USSR No. 337516, MKI E21C 41/100, 1972.
2. Barabanov, V. F., Development of steep and inclined seams open way with the placement of tailings in mined-out space / V. F. Barabanov, I. P. Chomakov, I. I. Dergachev // Coal. - 1959. - №12. - �.12-15 (prototype).
Method opencast mining of steeply-dipping, elongated deposits with internal dumping, in which the pit length is divided into the queue from which the first work to the design depth with external dumping, and the testing of the second stage is carried out with application internal dumping, placing overburden in the mined-out space of the first stage with the General formation of dump tiers with the development of mining operations in the direction of the end face along the entire depth, characterized in that the working zone height is divided into two parts, opening and development of the lower part is produced by inclined longitudinal layers with the rise of 20-25% towards the end with the help of wheel loaders and motor vehicles, are able to overcome these steep slopes, the height of the lower part is defined by the expression
where BTr- the width of the transport platform, m; hy- the height of the working of the ledge, m; i is the gradient of the access roadways, the share of units; Wd- the width of the bottom of the quarry, m,
working off the top of the working area is made with the use of the cross development system and sliding congresses, the width of which take on the basis of conditions on the collapse of rock exploded when they expand and simultaneously provide two-way passage of vehicles, support�describing a cargo link between lower - and upper ledges, testing of inclined longitudinal layers of the lower part of the working area are separate consistently generated top-down crotonylene-horizontal layers with a maximum height determined with consideration of the trajectory of movement of the loader bucket, when performing each of the next crotonylene-horizontal layer of rock mass pre-loosen, the loader produces its excavation and loading to road transport, mounted as close as possible to the bottom horizontal platforms.
FIELD: mining operations.
SUBSTANCE: method comprises the construction of three artificial elements: impervious screen, a protective berm, a protective coating. And the impervious screen is created by drilling of inclined wells of large diameter in the winter period from the upper site of the ledge nonworking edge side most affected to thawing, parallel to the slope surface at its full height followed by filling them with ice rock stones, chilled fresh water and freezing with natural cold, and the protective berm is erected over the mouth parts of the wells, starting from the upper edge of the ledge of the tapered section of calculated height, using layered freezing of overburden rocks, which in the summer period, including the surface of the ledge slope, to prevent thawing, covered with the protective coating, which is made in the form of removable flexible moisture-heat- and light-reflecting mat, removed with the onset of winter, the thickness of which is determined based on the mathematics.
EFFECT: prevention of thawing of frozen rocks of non-working ledge edges of pits.
SUBSTANCE: method comprises preliminary loosening of a block of rocks and half-rocks by simultaneous massive drilling holes in it with the maximum density across the whole area of the block prepared for extraction, using a multibar drilling unit, followed by the extraction of rock by machine ways destroying the rock solid blocks between the holes.
EFFECT: complete elimination of harmful effects on the environment and the operational staff at drilling and blasting loosening rocks.
SUBSTANCE: invention relates to the method of open mining of mineral deposits with creation of a dump. The method includes separation of career space by zones, height and pit perimeter, cutting of ledges and horizons on which overburden and mining works with removal of rocks by truck or by rail into dumps and via ore chutes to reloading points are conducted, and dumps are built up using the cyclic action facilities. Meanwhile a convex form of a working edge is formed, gradually being fitted into the edge differentiated by steepness on a final contour which is built up in view of minimum disturbance of walls of slopes and a edge according to the technology with minimum consumption of explosives (E) with removal and dumping of rock into a main dump located near a zone of overburden works outside a contour of a steep edge of a pit of the 1st phase; initially temporary dumps are used with self-transportation of rocks outside a pit, and with their partial re excavation, provide the minimum shoulder of tramming of rocks and ore using the crushing reloading points and conveyors from inclined planes on the top horizons to the steep and vertical at completion of a pit. And with deepening of mining operations the overburden zone is divided into two sites and rock is moved by combined transport from two sides into a dump under construction parallel to a edge slope in view of deformation of its separate sites, and rock dumping on a dump after crushing is carried out by line transport facilities using the mobile console, the minimum shoulder of tramming of rock and ore and costs of development of mountain weight on the first and the subsequent stages (turns) are ensured, and the first two layers of a dump are dumped according to cyclic and line TsPT technologies using motor transport or loaders (at re-excavation of rocks) that provides stability and robustness of the dump front according the developed technology of dumping, at the final stage the third layer is dumped, and the fourth layer of dump if necessary, according to its calculated volume and height and limit depth of a pit.
EFFECT: improvement of efficiency of field development during construction of a dump with large volume and height at decrease of costs of stripping and improvement of safety of dumping.
SUBSTANCE: after performance of drilling and blasting operations in an overburden bench during layer-by-layer excavation of the blasted rock to an extended bench and a final blade circuit on the formation roof of the mineral deposit within excavation heading throughout the length of the slab there left is a layer of the rock with negative temperature. This allows developing a zone of stable freezing, warming it up and strengthening it by action of solar insolation during development of the upper part of the breakdown. The rest rock layer is excavated to a final blade circuit after disposal of the upper part of breakdown throughout the length of the excavation slab.
EFFECT: reduction of influence of repeated freezing on productivity of a drag line and provision of its stable operation during excavation of blasted rocks of an overburden slab.
3 tbl, 2 dwg
SUBSTANCE: method involves positioning of an automated complex for deep development relative to the working face considering the direction of ore bodies settings. Control of mine rock parameters is performed by means of control sensors of physical and mechanical characteristics of mine rocks for adjustment of a mine rock cutting force considering rotation speed of a working element and movement speed of the working element in a vertical plane throughout the cutting depth and cutting direction by means of hydromechanisms of telescopic retraction and a turning mechanism of the head section. Width of capture of the ore body plane in a horizontal direction is provided by means of the positioning mechanism of the complex relative to guides; with that, information on circuits of destructed mine rock is sent from control sensors of mine rock circuits to a system control unit.
EFFECT: increasing productivity, improving reliability and enlarging technological efficiency of destruction of rocks of different strength and coherence degree by controlling a cutting force in a zone of processing and formation in a surface layer of the processed massif of destruction zones considering strength characteristics of rock.
2 cl, 3 dwg
SUBSTANCE: method involves driving of permanent and working trenches, installation of downhole and main transport pipelines, extraction of a mineral deposit with wedge-shaped producing blocks. Driving of a working trench is performed by means of a parallel cut throughout the length of an open-pit field, and direction of a mine work front line is offset in a circumferential direction, the centre of which is a stationary rotary station of transport pipelines with radius R equal to maximum width of excavation cut to observe parallelism of the axis of transport pipelines to the mine work front line. The formed angle αi between radius R and the line of the main transport pipelines is determined from a mathematical expression.
EFFECT: improving efficiency of a fan development system.
SUBSTANCE: method involves general-purpose robot-aided mobile complexes for production, extraction, preparation and processing of mineral raw material and concentrates, a unit of automated control of operation of a mining mill, a technical system for advancing, current and prompt reception of mining and geological information. Fully automated reception of mining and geological information is performed based on build-up of a digital model using a software, cyclic-flow destruction of hard rocks and half-rocks by means of a safe shallow blast-hole drill-and-fire system and flow-through soft rocks - by means of a mechanical method, adaptive and deep differentiated separate mechanised extraction and loading of mineral and rock mass of different categories, types and grades, through-type separate ore preparation in all technological operations, selective primary benefication of mineral raw material using an adaptive gravitational technology and a physical and chemical combined technology, separate processing of concentrates at the final stage using metallurgical methods.
EFFECT: improving development efficiency of small ore and non-metallic deposits of gold, lead, stannum and other mineral deposits.
SUBSTANCE: method involves construction of annular transport ramps of opposite direction with single-lane traffic of dump trucks docking in turning platforms, reloading points, construction of open pit sides with triple projections at an inclination angle of 60÷75°, which are separated with safety berms of required width, formation in some part of the open pit field of one of ore bodies of transport ramp (TR) with width providing for two-lane traffic of dump trucks and adjacent to turning platforms, production of ore for both ore bodies by means of a drill-and-fire method so that pillars are left in the open pit sides; delivery of ore to a factory; stripping - to external dumps, construction of underground mine workings and a water drain system; the modification stage involves reconstruction of the eastern side of the open pit (VRT) with partial processing of its pillars and transshipment of dead rocks into an internal dump, change of some part of single-lane transport ramp along the eastern side for a steeply inclined one, transportation of ore from lower horizons of the open pit with articulated dump trucks (ADT) to the transhipment area, transhipment into large dump trucks for delivery to the factory, and creation of a rock cushion at the open pit bottom. Besides, first, from the lower turning platform in the worked-out area of the western side of the open pit (ZRT) there dumped is the main ramp, thus providing transport communication throughout the depth of the open pit; at the open pit side reconstruction stage, a two-lane ramp is in-series formed with projections with a vertical slope and berms of minimum width and rebuilt into a ramp with an increased inclination in opposite direction; a new dump ramp is formed from the turning platform in the south-western part of the open pit; water drainage is relocated to an inter-pipe zone; TR of opposite direction with single-lane traffic along the western side is put out; TR with an increased slope is constructed from the upper turning platform in the north-western part of the open pit; ZRT pillars are mined out; the new dump ramp is enlarged, and loading and transportation of some part of ore is performed from it at mining-out of ZRT pillars by equipment with remote control (RC) to a transhipment point; another part of the ore is transported to VRT bottom, thus creating an ore cushion, and after ZRT pillars are additionally mined out to technologically practical depth, VRT pillars are broken out onto the ore cushion, thus putting out the transport ramp.
EFFECT: improving efficiency and completeness of development of a mineral deposit by an open-pit mining method.
9 cl, 4 dwg
SUBSTANCE: invention refers to the mining industry and may be used during extraction and processing of molybdenum-containing ores. A method for extraction and processing of molybdenum-containing ores involves open-pit field zoning, outlining of solid ore sections different by processing characteristics, selective extraction on the outlined sections with ores allocation to separate the flow from the zones with increased molybdenite oxidation and its direction to luminescent separation. A powellite enriched product of separation after its size degradation is directed to bulk floatation obtaining a rough molybdenic concentrate. Then after molybdenite oxidation in the rough concentrate, powellite is leached in an environment of a molten mixture of chloride and sodium silicate. The tail product of separation after its size degradation is directed to bulk floatation obtaining the molybdenic concentrate.
EFFECT: increasing a level and quality of molybdenum extraction to the end product from balance molybdenum ores with higher degree of molybdenite oxidation.
SUBSTANCE: in order to enlarge the range of simultaneous processing and versions of control of a cutting force in the processing zone, formation of destruction zones is performed considering strength characteristics of rock as to width of the processed surface at variation of functional and technological parameters and their rational combination under conditions of selective development of deposits with complex structures. Strength characteristics of rock are fixed by mine rock strength recording sensors connected through a system block to a control system of operation of hydraulic cylinders, and drum balance is provided by distributed offset of hydraulic cylinders. Pressure of working liquid in piston cavities of the hydraulic cylinders is designed for a force required for rotation of turning levers.
EFFECT: increasing productivity, improving reliability and enlarging technological efficiency of destruction of rocks of different strength and coherence degree by controlling a cutting force in a zone of processing and formation in a surface layer of the processed massif of destruction zones considering strength characteristics of rock at selective development of deposits with complex structures by means of open-pit surface miners.
2 cl, 6 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