Method of developing steep formations by bore-hole hydraulic mining
SUBSTANCE: invention refers to mining industry, and namely to development method of steep coal bed. Method involves development of coal bed by using pre-bored wells and a hydraulic monitor with a head piece. First, cross drift is made from the slope in the direction of the superface or soil of the bed, then in the cross drift there installed is a boring machine for boring inclined wells of large and small diametre at one and the same level through certain length; after that in the well of small diametre there installed is bore-hole hydraulic monitor with the head piece rotating at 180°, and coal breakage is begun at the sub-level; at that, the well of large diametre, which is broken as the sub-level development proceeds, is used for transporting the broken mined rock to the slope.
EFFECT: complex and rational use of subsurface resources, manless mining operations, reducing costs for the bed preparation and increasing labour efficiency.
The invention relates to the mining industry and can be used in the development of steep seams underground borehole gidrodobychnyh.
Known auger method, dredging coal, consisting in successive drilling diameter slightly smaller capacity of the reservoir, separated from each other by pillars of 0.25-0.3 m without attachment (Appcracks. The technology of mining. - M.: Nedra, 1985, S. 238-240).
The disadvantages of this method of testing are: large losses of coal in the bowels of reaching 50%, low labour productivity.
There is a method of testing a steep seams hydraulically sublevel caving (Vsechny, Abholung, Mnesarchus. Hydraulic underground coal mining. - M.: Nedra, 1986, S. 24). This method is characterized by significant costs of development workings.
The closest technical solution adopted for the prototype, is a well way to hydropobic solid minerals (Varine, Bwimage, Donsak. Well hydropobic solid minerals. - M.: Nedra, 1980, S. 186).
Along with the existing advantages of this method has disadvantages: high energy processes in mining coal and transporting it to the surface; large loss of minerals; low quality useful suit the activity because of the necessary grinding for delivery to the surface by means of air.
The objective of the invention is to eliminate the above disadvantages of the prototype, and thus the creation of such a way of development of mineral deposits, which will allow for the integrated and sustainable use of coal in the bowels due to the expansion of the scope of the method, a deserted mining of minerals, reducing the cost of preparation of the reservoir and increase productivity.
The invention consists in that in the method of designing cool formations downhole gidrodobychnyh, including the development of a coal seam, using the previously drilled wells and jetting from the nozzle, from the beginning of the slope spend ORT towards the roof or soil layer, then in Horta establish a drilling machine for drilling deviated boreholes large and small diameters on the same level for a certain length, and then in the hole of a small diameter set downhole jetting from the nozzle, rotating by 180°, and start blasting of coal in substage for transportation smitten rock in the slope, use a large diameter wells that breaks down as failover substage.
Thus, the development of the reservoir is sublevel wells through the Yu downhole hydro with a nozzle, rotating by 180°, stripes on the decline, with the transportation of rock mass along the borehole of large diameter. At the same time the preparation and development of the reservoir on the other side of the slope. Bilateral development of the reservoir provides a comprehensive use of the equipment and increases productivity.
The invention is illustrated by drawings. Figure 1 presents a diagram illustrating the sequence of training and testing podathey using hydraulic borehole mining. Figure 2 - section a-a in figure 1; figure 3 is a cross-section B-B in figure 1; figure 4 - section b-b In figure 1; figure 5 - section C-C in figure 1.
The method of designing cool formations downhole gidrodobychnyh as follows.
After drilling crosscut 1, 2 is the slope 3. At a distance equal to the height of the substage 4, is ORT 5, which is mounted drilling machine 6. Drilling machine 6 bore wells of large diameter 7 and the small diameter of 8. Drilling detail due to the screw rod 9 is removed in 10 banks, is laid on the slope 3, for transporting coal to the main horizon. After drilling 7, 8 for a certain length into the hole of small diameter 8 is installed downhole jetting 11 with a nozzle 12, a pivotable by 180°, and from a well of large diameter 7 retracts the drill becoming, to ensure sumotech is on hydrotransport.
Excavation of coal in the substage 4 is carried out in sequence (I, II, III, IV) high-pressure stream of water that is transported through pipes 13 and to transport slurry is used well of large diameter 7. For efficient transport of the slurry in the well 7, the latter being drilled with an inclination i=0,05-0,08.
From the well 7, the pulp goes to the receiving tray 14, and then in 10 banks. As testing substage, the bore 7 is destroyed, and the pipeline to supply water to the giant is shrinking.
After testing substage 4 left pillar 15 to maintain a slope of 3 and set the jumper 16.
Preparation and improvement of the underlying podathey is the same as the above.
The use of hydraulic borehole mining in underground mining of steep seams improves productivity, ensures safety and reduces the cost of preparatory workings.
The method of designing cool formations downhole gidrodobychnyh, including the development of a coal seam, using the previously drilled wells and jetting from the nozzle, characterized in that from the beginning of the slope spend ORT towards the roof or soil layer, then in Horta establish a drilling machine for drilling deviated boreholes large and small diameters on the same level, to determine the specific length, then in the hole of a small diameter set downhole jetting from the nozzle, rotating by 180°, and start blasting of coal in substage for transportation smitten rock in the SKAT well of large diameter, which is destroyed as a failover substage.
FIELD: mining engineering.
SUBSTANCE: invention relates to field of hydraulic boring-and-reaming of minerals, particularly to structures of gears for hydraulic boring-and-reaming solid minerals. Device consists of connected to each other tubal line with introduction and low end wall. Low end wall contains side water jet nozzle, pulp-receiving windows and jet elevator device. Diffusion cell jet elevator device by means of outlet is hydraulically connected to space between casing column and tubal line, and in bottom-most portion of low end wall it is installed butt water jet nozzle, hydraulically connected to separating cavity. Length of low end wall is more than distance between casing shoe and subface of producing stratum. Top part of casing pipe is outfitted by exterior reference ring and air-feeding pipe, rigidly fixed to casing pipe, and in bottom part of casing pipe there are implemented openings for feeding of compressed air into stope. Between casing pipe and body of low end wall, higher openings for feeding of compressed air, it is installed ring gasket.
EFFECT: it provides effectiveness increase of HBR ensured by creation of physical environment of side water jet device in unsubmerged space of stope.
SUBSTANCE: invention refers to underground development of mineral deposits, particularly to hydraulic excavation. The method consists in exposure of deposit by means of boreholes, in hydraulic fragmentation of rock with pressure water jet, in disintegrating and in converting fragmented mass into slurry in a working face, in transporting slurry from the working face to a pulp receiving borehole, and in lifting slurry to surface; also, prior to lifting slurry to surface it is intensively mixed; its heavy barren part (barren rock) is settled on the bottom of the washed-out cavity, thus backfilling mined space; further, light-weighted part of slurry consisting of mineral pulp is sucked off to an upper section of the cavity, wherefrom slurry (concentrated water-coal fuel) is lifted to surface and is transported directly to a consumer via pipes.
EFFECT: realisation of method in this way eliminates necessity to concentrate slurry on surface, to pile rejects and, consequently, decreases land subsidence owing to left in thickness barren rock, which serves as backfilling material of mined space in this case.
SUBSTANCE: invention refers to mining and is designed for development of thick deep seated deposits of loose self-breaking or preliminary broken minerals. The facility consists of internal movable pumping column 1 with hydro-monitor head 2 at the end, and of external pulp take-away pipe 3 with telescopic lower portion 4 with receiving opening 5. Telescopic lower part 4 of pulp take-away pipe 3 is movably connected with pumping column 1 and is designed to perform axial displacements. Pumping column 1 can have telescopic lower part 6 equipped with limiting-guiding rings 7 and 8. To limit a run column 1 and telescopic part 4 can be equipped with stop 9 secured to column 1 and with stops 10 and 11 on part 4. The telescopic part 4 of pulp take-away pipe can have density equal or slightly exceeding density of pulp due to property of material for pipe fabrication or due to closed interstice in structure (not shown). This facilitates its floatability in pulp. The facility can be made with variation of average density of lower part 4 of pulp-take away pipe.
EFFECT: simple and reliable facility ensuring efficient development of thick deep-seated deposits of loose self-breaking or preliminary broken minerals due to stable position of receiving opening of pulp take-away pipe in zone of optimal density of pulp.
4 cl, 1 dwg
SUBSTANCE: invention refers to mining and can be implemented at open development of mineral deposits by method of borehole hydraulic excavation. The installation consists of a high pressure column with channels for power water supply and for pulp lifting, of monitor nozzle, of a hydraulic lift, of a receiving chamber with openings and of a hollow head with a nozzle of the hydraulic lift. The installation is equipped with movable and fixed knives, with a spring loaded piston installed in the cavity of the head and designed to travel, and with guides located on sides of the openings; also the movable knives are installed in the guides, while the fixed knives are arranged in the openings. The movable knives are connected to the piston by means of rods. The invention facilitates reducing idle time and carrying out excavating process practically continuously to chamber completion.
EFFECT: reducing idle time and carrying out excavating process practically continuously to chamber completion.
4 cl, 3 dwg
SUBSTANCE: invention refers to procedures of mineral development of placers and sedimentary deposits with stable roof. The procedure consists in exposing the site of a producing reservoir with a main borehole embedding it into rock subjacent the said reservoir, in equipping the main borehole with a casing pipe, in assembling the bearing plate of the latter within boundaries of embedded part of the borehole, in forming in subjacent rock a receiving chamber with inclined outlet openings led to a floor of a producer, in leaving above them a preventive rock massif, in installation of a main hydro-monitor and a pulp-lifting device in the receiving chamber, in fluid wash of main reserve of mineral, in successive fluid wash of mineral placed above massif, and in lifting pulp via the main borehole from the receiving chamber to surface. Development is carried out chamber by chamber, for the purpose of which there are bored auxiliary boreholes around the main one with diametre less, than that of the main, wherein auxiliary hydro-monitors are installed; flush of reserves of a corresponding chamber is performed from each borehole; before flush of chamber reserves above massif there is carried out lifting of the main hydro-monitor and cased column; further the bearing plate of the latter is assembled and the main hydro-monitor is installed above massif within boundaries of thickness of the producer.
EFFECT: increased yield rate from one borehole, more rational development of deposits due to decreased loss of mineral and reduced extraction of barren rock to surface.
SUBSTANCE: invention refers to mining and can be implemented at borehole hydraulic excavating of minerals. The installation consists of a high pressure column, and of a central pulp lifting column installed inside the high pressure column, interior cavity of which is connected to internal cavity of the high pressure column via a nozzle of hydraulic lift; in a lower part of the high pressure column there is installed the nozzle of the hydraulic lift; an additional nozzle with a suction chamber is rigidly connected to the nozzle of the hydraulic lift. The nozzle of the hydraulic lift is connected to the high pressure column, is designed to rotate relative to its lengthwise axis and is equipped with a tailed jet; also tails of the jet are bent opposite to rotation direction; while the suction chamber is equipped with a pulp intake with openings assembled radial to the suction chamber and directed to the side of hydraulic monitor rotation. The invention facilitates increased efficiency due to intensification of pulp formation process and due to increased per cent contents of extracted material in pulp.
EFFECT: increased efficiency due to intensification of pulp formation process and due to increased per cent contents of extracted material in pulp.
SUBSTANCE: invention refers to open development of mineral placers, particularly to mining and concentration of gold containing placers in winter. The procedure consists in exposing works, in sand excavating and in sand transporting to a basin, in flushing and in dump piling. Also, in winter primary excavation and sand transporting are performed with preliminary piling sand on ice of the basin, while the secondary excavation and flushing are carried out in a warm season.
EFFECT: increased degree of disintegration of hard flushed clayish sand and reduced losses of valuable component.
2 cl, 2 dwg
FIELD: oil and gas industry.
SUBSTANCE: invention refers to development of mineral deposits, particularly clay placers, and can be implemented in mining industry. The method consists in striking developed placers, in their layer-specific excavation with parallel trenches leaving between-trenches massifs, in concentrating and in piling. Also between the first trench and the circuit of developed deposit an additional ditch is made, wherein water is supplied; when a successive trench is entered, each preceding trench is successively filled with water. When the last trench is driven, deposit is flooded; between trenches massifs are debugged by means of a drag or dredger; notably, debugging is performed from the first trench to the last one.
EFFECT: increased efficiency of clay placers development by means of increased degree of disintegration and extraction of valuable component at reduced technological losses.
2 cl, 2 dwg
SUBSTANCE: invention refers to development of deposits, particularly, gravel deposits, and can be implemented in mining industry. The method consists in stripping sand, in excavating and transporting sand to a hopper of a washing installation, in concentrating and in piling. Prior to transporting sand into the hopper of the washing installation, sand is piled in a trench laid in the center of the gravel deposit along the length of a production block at the depth below the level of the soil of the sand bed; the trench is filled with water. Also sands are piled in the trench below the water level, and their successive excavation is performed by the underwater method.
EFFECT: increased degree of disintegration of hard washed clayish sand and reduced process losses of valuable component with reduced cost for sand transporting.
SUBSTANCE: method of development of buried water-flooded placers includes preliminary concentration of useful component of sands in lower portion of placer by means of excitation of elastic oscillations in placer sands and successive stoped excavation. A tubular shell is inserted into the placer; the height of the shell exceeds the distance from the surface to the float of the spacer. Excitation of elastic oscillations in spacer sands is performed by means of their transmitting from the surface via the tubular shell. After compressive force has been formed from interior surface of the shell onto contacting surface of covering volume of barren material and after completion of vibratory processing the hydraulic stoped excavation of lower part of the placer is carried out; washing water is supplied via sprayers assembled at walls of the tubular shell and pulp is withdrawn via soil intake openings located at walls of the tubular shell between the sprayers. Also after completion of stoped excavation of lower part of the placer the stoped space is backfilled by supplied backfilling pulp and water withdrawal. Further backfilling pulp is formed from mixture of water with barren rock, for instance, with tailings of sand concentration. After backfilling of excavated space pressure onto surface of covering volume of waste material contacting with interior surface of the shell is dropped to zero and the shell is extracted.
EFFECT: increased selectivity of excavation.
SUBSTANCE: method consists in preparing extraction pillar by driving transport and ventilation entries, in delineation of extracted stripe with coal chutes and air shafts along bed pitch line from transport to ventilation entry on both sides of stripe, in driving assembly chamber at ventilation entry, in constructing sections of powered roof support in assembly chamber, in mechanized mining of coal in step-like mining face in two layers, in forced transporting of coal along face and self-flowing transporting from upper layer to lower one and from step to step to transport entry, and in ventilating mining face by all-mine depression. Working space under each section of support is profiled with insignificant advanced mining of coal in the lower layer and with leaving temporary support massif at the support of the bed in the upper layer extracted before displacing sections of support at the final stage of extraction of the stripe of each section. The boundary of the upper layer is profiled along arc equal to radius of turn of a panel ceiling. An outlet opening is cut from working space of the lower layer of the extracted stripe to the transport entry limiting its height by the height of transport position of the support section. The section of the support is driven to a transport position, further it is removed to the transport entry through the outlet opening, and the outlet opening is backfilled with materials not subject to repeated utilisation.
EFFECT: increased efficiency and safety of development.
SUBSTANCE: invention refers to mining, particularly to development of steeply inclined coal beds of medium thickness with long pillars along strike, when pillars are extracted in strips along decline. The method of development between discontinuities consists in preparing an extraction pillar by driving transport and ventilation drifts, and in profiling mining strip between two mining-geological discontinuities with driving the pillar of coal shoot on a flank parallel to flank line of continuity fracture of coal containing massif; the pillar of coal shoot is equipped with a man way compartment; the ventilation drift is equipped with an assembling chamber, wherein sections of powered roof support are installed; the said sections are structurally connected with an actuator made in form of a projecting arm equipped with a horizontally installed worm cutting tool. The sections of the roof are connected between them with hydraulic jacks of support advancing and are put into operation successively, shaping banks in mining face; coal is cut first at the flank from the coal shoot and further to the ventilation drift. Mining of coal is performed alternately in all banks; broken coal is transported simultaneously-successively to coal shoot. Ventilation of the mining face is executed by all-mine depression. At final stages of strip mining, in worked out space of the strip there is constructed the second slope, the ventilation slope for facilitating ventilation of the mining face and arrangement of an escape way.
EFFECT: invention facilitates increasing efficiency of coal mining.
SUBSTANCE: invention relates to mining, particularly to the method of developing a thick flat coal bed, based on board-and-pillar mining system and comprising preparing the mine section in the layer nearby the seam roof by producing haulage and ventilation openings and extraction chambers from the haulage till ventilation opening in descending order. As the extraction chamber is produced nearby the said seam roof, a part of it is forepoled nearby seam floor by blasthole drilling into the upper layer floor, on both sides of extraction chamber, at the 20° to 30° angle to the chamber traverse cross section, and fixing thereat steel bolts, on the side of bed hanging wall, and polymer bolts, on the side of lying wall. On deepening the extraction chamber till the seam roof, its walls are held by roof bolting in producing extraction chamber nearby the roof to provide for higher safety in coal bed development.
EFFECT: higher safety in coal bed development.
SUBSTANCE: invention can be implemented for exposing and development of Elginskiy coal basin in Republic of Saha (Yakutia). The method of underground development consists in division of the basin into upper and lower beds, in driving pair galleries in the bed and in driving auxiliary pair of inclined excavations till the very upper bed in every elevation, also in using one branch of inclined excavations and galleries for transporting coal from the point of loading to a concentration plant. All beds of the basin are developed by an underground method successively in a descending order, for the purpose of which within the boundaries of bed attitude contour and for stoped excavation opening out of each bed is performed with long columns by means of mechanised complexes. The rest coal stores at exposures and those not excavated by long columns are worked out either by short wall face technology or by drilling coal out at bed exposures.
EFFECT: facilitating preservation ground surface at deposit area and eliminating hazardous effect to environment.
SUBSTANCE: invention refers to development of steeply inclined coal beds of medium thickness with long pillars along course of bed extracted by strips along pitch. The method is implemented between hitches and includes preparing an extraction pillar by leading transport (1) and ventilation (2) entries, contouring an extracting strip with coal (3) and ventilation chutes along the line of the bed pitch from the transport entry till ventilation entry on both sides of the strip; arranging assembly chamber 4 at ventilation entry 2, assembling therein sections 5 of a mechanised face support. Coal chute 3 is led on flank of the extraction pillar along the line of bed pitch from one side of the extracted strip. The first section 5 of the mechanised face support is assembled in the range of coal chute 3. Sections 5 of the mechanised face support are tied between them with thrusting jacks. At an initial stage of coal extraction a mining face is formed as a rise step entry; additional sections 5 of the face support are in turn assembled and put into operation. At a final stage the width of the extracted strip is limited and open area is separated from massif with a face support. A ventilation chute along the bed pitch from the counter side of the strip is arranged in its extracted space behind the last section 5 of the face support. Coal is extracted at each section 5 separately. Loose coal is transported along the mining face with transfer of transport flow from one extracting-transporting body to another using self-flow transporting from step to step.
EFFECT: increased efficiency of coal extraction.
SUBSTANCE: invention refers to mining and can be employed at underground development of high gas bearing coal beds. When pair development entries are developed bores of big diameter are drilled from one of them through coal massif with their successive bridging from the side of a conveyer entry of a developed pillar. Number N of boreholes drilled in each coal massif is determined from the expression confirming ensured integrity of carrying capacity of the coal massif. Maintaining the said section of the conveyer entry with a face support beyond a mining face is carried out along the not more, than ¼ length of the coal massif ensuring exhaust of methane-air mixture from the mining face. While developing the pillar, as the mining face advances, exhaust of the flow from a supported section of entry into a ventilation entry of subject to extraction pillar is performed in three stages at each section between ventilation props and withdrawal flow of methane-air mixture via the said section of the conveyer entry. Each borehole is preliminary bridged off at executing each stage of exhausting methane-air mixture. Also simultaneously with exhaust of methane-air mixture a gas-drainage chamber is arranged.
EFFECT: increased efficiency and safety of development due to reduction of costs for maintaining not-cleared beyond mining face conveyer entry and due to improved mode of mining face ventilation.
2 cl, 5 dwg
SUBSTANCE: method of mine working can be implemented at developing of mildly sloping or inclined shallow and medium coal beds. The said method includes development of mining level by means of transport and ventilation driving with unloading platforms on both sides of a drift. Perpendicularly to the drift there are made stables which are transformed into unloading platforms by means of boring of unloading boreholes advancing the drift; the said unloading boreholes are separated between themselves with virgin coal. Further entry driving is carried out up to the end of unloading boreholes in massif, free from the influence of underground pressure with unloading platforms. At that rock from drift top breaking is piled into the unloading boreholes, after what an operation cycle is repeated.
EFFECT: reduction of coal losses in massifs, reduced dilution of coal with rocks caused by driving and repair of drifts, acceleration of preparing and completion of mining level, additional production out of boreholes, and providing repeated and excluding repair usage of development excavations.
SUBSTANCE: invention is referred to a mining industry and can be used in development of firm minerals. The method of hydro mining operations includes hydraulic crushing of a rock bed, hydro transportation of broken off rock, supply of stowing material in a worked out room using a pipe line. Loose rock is enriched and dehydrated, and the waste received at beneficiating of loose rock is blended with a pulp received at dehydration of loose rock. The obtained mixture is used for filling the waste area. Sacciform resilient perforated shell is put in the waste area. Further on, it is connected with the filling material pipe and filled with filling material under heavy pressure. The flowing fluid obtained by perforation is collected and sent for treatment and recirculation.
EFFECT: better filling reliability of the waste area and safety of mining operations, lower expenses for filling, improved ecological situation on mine and in its neighborhoods due to fluid recirculation in the technological process.
FIELD: mining industry.
SUBSTANCE: method is intended to be used in the mining industry for extraction of coal and other minerals from pitching and steeply pitching seams. The cutter/loader moving along the stope by a pulling cable pulls belt out of the telescopic part of the belt-type conveyor using a run-around roller pivotally connected to the tail end of the loader. The conveyor belt, with its working side being furnished with fins, after leaving the telescopic part, is directed to the stope space by the deflection assembly, the working side of the belt facing the seam roof. The run-around roller at the tail end of the loader turns the belt so that the belt working side faces the seam floor, and the belt moves in the belt road direction. The coal cut by the cutter/loader gets under the loaded part of the belt by gravity and is dragged along the seam floor to the belt road, covered by the belt. The seam pitch being high enough to provide for coal transportation along the stope by gravity, the working part of the conveyor belt decelerates its movement, otherwise it drags the coal along the seam floor. The cut coal covered by the conveyor belt is less prone to being carried away by the ventilation current, and thus forms less dust in the workspace.
EFFECT: increased mining efficiency thanks to forced mechanical transportation of cut coal along stope.
FIELD: coal mining.
SUBSTANCE: method is based on debugging room-and-pillar system and includes mine section treatment in layer near roof of the seam with transport 1 and ventilation 2 workings with sequential installation of extraction chambers from transportation 1 till ventilation 2 working in descending order. At that roof and rim of excavating chambers 5.20 are fixed with anchoring steel polymer shoring. Coal excavation is carried out with frontal function combine 4 in interchamber pillars 21 by diagonal entry way 8,10,22,23, directed at the angle 120...135 degrees to axle of excavating chamber from the both sides. Entry way roof is fixed with anchor shoring. Broken-down coal transportation to transport working 1 is carried out by self-propelling car 6. Between entry ways 8,10,13 one leaves under breaking pillars 8,15. After the excavation of several entry ways in layer at the roof of the seam by the same combine 4 one deepens excavating chamber 20 till seam ground and take out end entry way 12 under corresponding entry way 8 in layer at roof of the seam, i.e. under anchoring shoring. After entry way excavation in layer at seam ground combine is returned to chamber ground in layer at roof of the seam and excavation of several entry ways in that layer is carried out. Then the chamber is deepened till layer ground and several entry ways are excavated in the layer at seam ground and so on. Axis slope angle of excavating chamber, entry ways, transportation and ventilation workings and ramps to the horizon are taken no more admissible for applied mechanised systems for scouring works, and entry way length is no more than combine length. Entry ways, worked from the next chamber side in one interchamber pillar, are located in checkerboard order as to entry ways, worked from the side of previous chamber.
EFFECT: improvement of working effectiveness and changing of transport means of continuous action on means of cycling action.
2 cl, 3 dwg
FIELD: mining industry.
SUBSTANCE: method includes driving of layer transporting and ventilation mines along soil and ceiling of bed, in massive and in extracted space, cutting of cleaning mines in cross-section of bed at angle of 27°, mechanized delivery of coal along bed mines to coal furnaces and vertical dropping of coal to furnaces. Extraction of slanted transverse bed is performed along bed diagonals having direction to horizon at angle of 27°, to provide for free sliding of coal without degradation. Delivery of coal from cleaning mine placed at angle of 60° to layer mine, to back field mine is performed by self-delivery from any place of extraction field along layer mine, field coal-lowering mine and field slanting coal furnace, being at angle of 27° to horizon. Field slanted coal furnaces are placed at distance from one another along 20 m normal. Field coal mines in form of fans of three mines are connected on field slanted coal furnaces at distance of fan start from one another of 60 m with output of mines ends to each layer mine of group of three above-lying slanted-transverse layers for whole diagonal length of extraction field at distance between mines outputs along layer soil of 60 m. Ceiling of cleaning mines may be supported without load, utilizing mechanical traction on the side of ventilation furnaces for pressing moveable support tool to layer ceiling.
EFFECT: higher efficiency.
2 cl, 3 dwg