RU2215148C2 - Method of opencast mining of permafrost placer deposits with internal dump formation - Google Patents

Abstract

FIELD: mining industry. SUBSTANCE: method includes dividing of opencast field into blocks, loosening of rocks within block, opening and extraction of pay bed with location of overburden rocks into worked-out space of worked-out block. Blocks are divided into parallel stopes in direction of their mining. Pay bed of next stope is located on pay bed of previous stope. Overburden rocks of next block are located onto worked-out space of subsequent stope of previous block. EFFECT: higher efficiency of placer mining. 1 dwg

Description

 The invention relates to the mining industry and can be used in the open development of permafrost alluvial deposits with internal dumping.

 There is a method of developing horizontal mineral deposits using conveyor transport and internal dumping, where the quarry field is mined by two oncoming cutting trenches with a pillar — a lintel located perpendicular to the front of the work and used to install a conveyor on it (ed. St. USSR 343042, MKI E 21 C 41/00 Sidorov AS, Onoprienko NA, Golovko LK et al. Open development method).

The closest technical solution is the method of open development of permafrost alluvial deposits, including dividing the quarry field into blocks located across the strike of the placer, softening the rocks within the block, opening and excavating the productive formation of sand, followed by their transportation to the concentration plant with the development of the formation in the block transverse approaches and placement of overburden in the worked-out space of a block mined in order (ed. St. USSR 852010, MKI E 21 C 41/00. Emelyanov VI, Mamaev Yu.A., Savenko RG and others. Method of open development of permafrost alluvial deposits.)
However, in the development of permafrost alluvial deposits, internal dumping involves loosening and transporting the productive formation in the winter to the dump of the processing plant, which is more expensive than summer washing of the sands as the defrost occurs. Existing technologies for peat bulldozer overburden with external dump formation do not meet environmental protection requirements, and repeated bulldozering of external dumps into the worked out space requires the same costs as for peat overburden. As a rule, funding for these works is not provided.

 In this regard, there was a problem of reducing the cost of developing permafrost placers with internal dumping and washing the sands as a result of defrosting without transportation to a winter dump.

 Thus, the known methods do not provide for the effective development of permafrost placers with internal dumping and do not meet environmental safety requirements.

 The objective of the proposed technical solution is to ensure the preparation of sand for washing as the defrost with simultaneous internal dumping and reclamation of the quarry field.

 The technical result obtained by the implementation of the invention is that the block is divided into parallel runs in the direction of their development with the placement of a productive layer of a subsequent run to a productive layer of a previous run, overburden rocks of a subsequent block are placed on the vacant area of a subsequent run.

 Comparative analysis with the prototype shows that in the claimed method, the block is divided into two parallel runs in the direction of their mining, overburden of the previous block (two runs) is placed on the worked out space of the previous sunset. Then the reservoir of the subsequent (second) entry is placed on the reservoir of the previous (first) entry. Overburden of the previous block is placed on the vacant area of the subsequent (second) entry. Thus, internal dumping is achieved without transporting the reservoir to a temporary dumping site.

 Comparison of the proposed solutions with other technical solutions in this technical field did not allow to identify in them the features that distinguish the claimed solution from the prototype, which allows us to conclude that the criterion of "existence of differences".

 The drawing shows a cross section of the front of mining with internal dumping.

 A method for the open development of permafrost alluvial deposits with internal dump formation with the separation of the quarry field into blocks is proposed. The method involves softening rocks by one of the known methods, for example, by blasting, mechanical or hydraulic thawing. Then overburden is performed with the placement of overburden rocks in the worked-out space of the block worked out in order.

 The method includes the operations of sinking the initial split trench 1, dividing the deposits into blocks 2, 3, dividing the block into the previous 4 and the next 5 calls, moving the overburden 6 and the productive formation 7, forming an internal dump 8.

 The method is carried out in the following way. First, a cutting trench 1 passes, then overburden rocks of block 2 are placed into the excavated space of the trench, for example, by a bulldozer with mechanical loosening. After that, block 2 is divided into sets. The productive layer of the subsequent sunset 5 is placed on the productive layer of the previous sunset 4, and overburden of block 3 is placed on the vacant area of the sunset 4. Next, the cycle repeats. After washing the reservoir, a part of the overburden of blocks placed at previous runs is placed on the vacated area.

 Thus, extraction of the productive formation by the most economical technology is achieved as the bulldozer defrosts with simultaneous internal dumping.

Claims (1)

 The method of open development of permafrost alluvial deposits with internal dumping, including dividing the quarry field into blocks, softening the rocks within the block, opening and excavating the productive formation with the placement of overburden in the worked-out space of the worked out block block, characterized in that the blocks are divided into parallel openings according to the direction of their development, and the productive formation of the subsequent entry is placed on the productive layer of the previous entry, and the overburden of the subsequent b Lock is placed on the worked out space of the subsequent entry of the previous block.