Development method of pillars of drilled gravel boreholes of permafrost zone

FIELD: mining.

SUBSTANCE: method involves mining activities performed during summer season by water jet by means of devices installed in underground cavities pre-drilled from surface of the well along longitudinal axes of pillars at certain distance from each other with pulp lifting to the surface and its supply via pulp line to flushing device in order to extract useful component and laying of dehydrated flushing remainders formed during washout process of sands so that distributed filling masses are formed. Pillar recovery is performed in two stages during two years. During the first year the pillars are recovered partially so that gaps are left between cavities washed out between them, which are developed using the same method in the next year; at that, in order to strengthen compression properties of filling masses, they are frozen with natural cold during winter period.

EFFECT: avoiding execution of underground mine workings at pillar extraction; possibility of selective development of technogenic deposit; arrangement of dehydrated flushing remainders in the worked out space and its complete use; avoiding cavings in the ground surface; recovery of rock mass continuity and stabilisation of its temperature mode; minimum contamination of environment; eliminating the necessity for execution of recreation works.

2 dwg

 

The invention relates to mining development placers of the permafrost zone by underground methods, in particular pillars left in placer mines (CS) during the initial development of the field.

A known way to re-technogenic stocks contained in the columns, left during the initial underground mining of placer deposits of the North [1] (Prototype).

The main disadvantages of this method are:

- the necessity of drilling a large amount of revealing and tasks

- high severity conduct underground mining, since they have to operate within man-made disturbed area of the massif;

- high cost of maintenance (fixing) mining and treatment space;

- the lack of a closed-loop treatment of solid substances extracted from the lithosphere during underground mining of placer deposits and subsequent processing (washing) of gold-bearing Sands;

- broken and cannot be restored integrity (continuity) of the massif after removal of anthropogenic load (end of mining);

- dumps, remaining on the earth's surface at penetration revealing the workings, and after washing the underground sand in the summer, change the terrain and disfigure the landscape;

p> - drilling and blasting technologies used in the mining operations pose significant dynamic loads on anthropogenic disturbed mountain range trigger displacement;

- it is possible failures of the earth surface when possible displacement of the falling of the goaf in the process of doing work;

seasonality of operations (in winter being underground mining operations, in the summer time, washing the extracted Sands);

- the need to import large quantities of explosive materials;

- the need to perform a large number of technological operations;

- low level of reuse of solid waste processing gold-bearing Sands;

- do not use the mined-out area formed in the process of conducting underground mining operations.

We propose a new method of mining the existing pillars of exhaust PM the permafrost zone of the jet, the implementation of which will contribute to the solution of a number of technical and environmental objectives: the elimination of conducting mining operations in underground mining of pillars; the ability of the electoral (cluster) of technogenic deposits, placement of dewatered tailings washing in the developed space CS and its full use, with the exception of the educational failures of the earth surface; restore C is the integrity of the rock mass and stabilize its temperature mode; minimal environmental pollution; except for the need to conduct recreational activities.

The required technical result of the invention is assumed to be obtained when taking into account the structure and lithological composition of sand placer deposits of the permafrost zone, the technological features of construction of underground tanks in the frozen dispersion rocks jet:

- producing formation of gold-bearing Sands of the Quaternary complex, dispersed, loose, legkorazmyvaemykh rocks;

- the presence of well-developed technology of construction of underground cavities in the frozen dispersion rocks by the way jet in permafrost conditions;

- quality disintegration dispersed species (Sands) pressure jets that provide high recovery of useful component in subsequent enrichment on the flushing device;

- the use of high-performance and well-established in the North mountain technologies and commercially available equipment.

In addition, the required technical result of the rapid freezing of filling arrays of the invention is assumed to be obtained also when taking into account the maximum utilization of climate, natural resources of the permafrost zone:

- the long winters is with extremely low temperatures;

- the presence of permafrost rocks with high durability in a frozen state;

- the presence of low-grade cold as atmospheric and accumulated rocks.

The proposed method differs in that the re-development of man-made sand contained in a tape pillars of the waste before the CS, is conducted in two stages over two years, in the following order: after finding the exact locations of the tape pillars, along the Central line placement, with the surface at a certain distance from each other proburivaya the vertical hole of the desired depth to the upper boundary of the productive formation); then in the summer Sands pillars wash pressure jets of water with the formation of dispersed cavities height equal to the thickness of the formation, between which gaps are left (the pillars tambohorano forms, supporting goaf); then make the rise of the pulp to the surface and feed it to the flushing device, which produces the extraction of useful component; then the tails wash down and placed in underground cavities to fill, including the trunks of the wells, with the formation rock backfill array, and process water is lightened and re-used for jet and is romawki Sands. In the winter of filling the array promarijuana natural cold with the formation of a solid Leopardi structures that support the developed space. In the following year (the second stage) in the same pattern are full processing of pillars, enrichment sand, mined-out space and Pomorska filling arrays.

Introduced in the formula of the invention, a significant feature, as a method of jet for testing tape pillars CS, avoids the penetration opening and development workings, to conduct mining operations without the use of drilling and blasting operations, to make selective (cluster) development of technogenic Sands with minimal undermining of waste rock, which gives a significant economic effect.

Another significant feature is that the solid material washing (tails) filled with washed out underground cavity with the formation of uniformly dispersed worked field CS backfilling of rock masses high compression characteristics; thereby eliminating the formation of dumps on the earth's surface and providing a high density of stacking, integrity (continuity) of the rock mass, the full use out space, providing closed-loop circulation of solid material the print materials of the lithosphere.

The next significant feature is that elevated filling arrays proparaguay natural (atmospheric) cold in the winter without the use of power plants, with the formation of durable artificial Leopardi structures that support the mined-out area, under the protection of which produce the final revision of the tape pillars, thus preventing the failure of the earth's surface, helping to restore the temperature field and the continuity of man-made disturbed the rocks.

Equally important is the fact that there is no seasonality of work - all the main work is done in the summer; and in winter, produce only Primorsko filling arrays does not require the presence of the people; in the process of erosion of the cavity Sands composing the whole, well disintegrate, which provides a high degree of extraction of valuable components in the enrichment process.

The inventive method is illustrated by drawings (figures 1 and 2). Figure 1 presents the waste plan CS, technological complex arrangement of all equipment, reflecting all stages of work on the development of tape pillars in the practical implementation of the proposed method, and figure 2 - cross section.

Conventions on the drawings:

1 feeds cnie pillars;

2 - stope waste CS;

3 is a vertical borehole;

4 - day surface CS;

5 - layer of peat;

6 is the upper bound of the product of the reservoir Sands;

7 - gidromassazhnye Assembly;

8 - water pump;

9 - the conduit;

10 - washed out underground cavity in the rear (under erosion);

11 - the lower bound of the productive formation Sands (raft placers);

12 - leave comboarray frozen bespolostnoe rock gap (pillar);

13 - hidroelektra-airlift-type installation for lifting Sands;

14 - slurry line for submission of the eroded sand on Prompribor;

15 - flushing device;

16 - slurry line to transport tailings from Prompribor for laying underground cavities;

17 - underground cavity (in final form);

18 - filling rock mass;

19 - freezing businesslicense air thermosyphons;

20 - artificial tape pillars.

Implementation of the proposed method in practice to simulate the tape of pillars 1, located within the exhaust of a mine field 2, using the technology of jet produced in two stages, beginning (1st stage) with the dispersed drilling vertical wells 3 with the surface 4 along the Central line of sight along the entire length at full capacity of peat 5 below the level of the upper border of roductive reservoir Sands 6. In the well into the summer set gidromassazhnye units 7, the water in which (upon reaching temperature 5÷7°C) served by the pump 8 through the conduit 9 and produce erosion of sand on the entire width and height of the pillar with the formation of underground cavities 10 up to the float, placer 11. Between eroded cavities leave gaps (box of frozen pillars 12) to maintain the goaf, which work for next year (2nd stage). Formed in the process jet Sands pulp raise hidroelektra-erlitou installation 13 to the surface and slurry line 14 serves to flush the device 15, which produces an enrichment of the Sands. Tails leaching after thickening the slurry line 16 serves formed in the cavity 17 to complete its completion, including the well bore, with the formation of the backfill array 18. Work done with the onset of the cold period and lowering the temperature below 5°C.

In the winter of filling the arrays in cavities proparaguay natural cold with businesslicense installations - air thermosyphons 19 with the formation of artificial dispersed turbobrush Leopardi pillars that support the mined-out area, under the protection of the summer season next year (2nd stage) for the same scheme finalize the tape pillars in full, will also perform all of the above work. Thus fulfill all available within waste mine field of natural pillars, and place them build a solid, artificial frozen tape pillars (20) from the tailings leaching, which in frozen form have high strength, are not inferior to natural, thereby ensuring the integrity of the earth's surface above the mine field.

The main advantages of the proposed method:

security operations;

exception conducting underground mining - working driving and cleaning work using drilling and blasting technologies;

- minor violations of the natural environment;

- minimal anthropogenic impact and violation of the mountain massif;

- minimum consumption of materials;

- exclusion of seasonality of operations;

- high mechanization and automation of all technological processes: erosion Sands, issuing them to the surface, transportation, enrichment; transportation and stacking of tailings in underground cavities, Primorski filling arrays;

- simplicity of construction, Primorski and high load-carrying capacity built of frozen backfill arrays;

- no dumps on the ground;

- high mechanization and low cost of borehole drilling;

- full use of depleted underground space

- selective (cluster) development of sand pillars with minimal excavation waste rock;

- quality disintegration of sand in the process of the jet and, as a consequence, a high degree of extraction of useful component during enrichment on the Prompribor;

- ensuring closed-loop treatment of solid materials in technogenic Sands of pillars;

low material costs for the purchase of equipment and installation of all types of work;

- no need to perform recreational activities;

- low cost of extracted component;

- a small amount and ease of technological operations;

- low cost Primorsko artificial pillars through the use of natural cold and businesslicense units;

- ensuring closed-loop circulation of water.

The source of information

1. Kotwicki CENTURIES and other Underground re-development of self-propelled machines frozen placers // Kolyma, 1987. No. 7. - P.10-13.

Method development pillars worked placer mines of the permafrost zone, including the conduct of mining operations in the summer, the jet devices installed in pre-drilled from the surface of the bore along the longitudinal axis of pillars at a certain distance the AI from each other with the rise of the pulp to the surface and feed her in the slurry line to flush the device to extract the desired component and the placement of dewatered tailings leaching from the process of erosion of the Sands underground cavity with the formation of dispersed filling mass, characterized in that the mining of pillars are produced in two stages over two years, and in the first year of the pillars develop partially, leaving gaps between washed them in the cavities, which work the same way next year, thus to enhance the compressive properties of the filling mass in winter their proparaguay natural cold.



 

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2 dwg, 2 ex

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Hydraulic monitor // 2272143

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6 dwg

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EFFECT: reduced power inputs for hydraulic rock cutting.

2 dwg

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