Mining method of nearly horizontal mineral deposit of opencast coal field by casting and internally dumping

A mining method and open-pit mining technology, which is applied in the field of open-pit coalfield near-horizontal ore deposits in the mining field of upside-down piles and internal discharges, can solve the problems of occupying cultivated land, increasing the distance of stripped objects, and increasing costs, so as to reduce the distance between internal discharges and save transportation cost, environmental friendliness

Inactive Publication Date: 2013-12-25
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with underground mining, the main disadvantage of open-pit mining is that it needs to remove a large number of strippings covering the ore deposit, and most of these strippings need to be discarded outside the boundary of open-pit mining, occupying a large amount of cultivated land, causing strippings to be transported far away. increase, cost rise

Method used

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  • Mining method of nearly horizontal mineral deposit of opencast coal field by casting and internally dumping
  • Mining method of nearly horizontal mineral deposit of opencast coal field by casting and internally dumping
  • Mining method of nearly horizontal mineral deposit of opencast coal field by casting and internally dumping

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Example 1 : If the thickness of the overburden of the ore deposit is not large, its thickness is generally less than 50 meters, and the thickness of the ore body is not large, the mining method of direct dumping and internal drainage without transportation can be adopted, that is, the mining and transportation operations are completed by the same equipment.

[0024] Mining equipment can be single bucket excavator, or bulldozer, scraper, front loader, mechanical shovel or dragline. , the stripping material in the second area is discharged in the goaf of the first area, and the mined minerals are transported out of the stope through the transportation channels located on both sides or in the middle of the ditch. Peel off the steps into one step.

[0025] When the thickness of the overburden of the ore deposit is relatively thin, generally between 20m and 50m, use bulldozers, scrapers, front-loading equipment, or single-bucket excavators to open the first ditch by horizo...

Embodiment 2

[0027] Example 2 : When the thickness of the overburden layer of the ore deposit is relatively large, the general layer thickness is >50~80m, and the part of the stripped material that exceeds the height of the step height of the non-transportation dumping and internal drainage mining method is set up to set up stripping steps in advance. The specific method is as follows:

[0028] 1) The advanced stripping steps adopt the mining method of transportation, inversion and internal drainage, that is, the mining and transportation operations are completed by different equipment; the height of the steps is determined according to the specifications of the mining equipment used and the thickness of the overburden layer. Generally, it is one step, or it can be multiple Steps, the stripped objects in the first zone of mining still need to be discarded outside the mining boundary. The advanced stripping steps can use single-bucket excavator-automobile mining process system, single-buc...

Embodiment 3

[0030] Example 3: When the thickness of the overburden of the ore deposit is relatively large, the whole mine can also adopt the method of transportation and stacking mining alone, that is, the open-pit mine is divided into several mining steps. According to the equipment used and its specifications, when the bottom stripped After the ore deposit is mined and moved forward to a safe distance, the open-pit mine implements internal dumping from the bottom step, forming the first inner row of steps and reaching the minimum flat width of the dumping step, and establishing the second inner row. Steps, when the second inner row of steps reaches the minimum flat width requirement, the third inner row of steps is established to form the subsequent inner rows of steps until the surface, and the excess stripping materials need to be discharged to the external soil discharge field. When all the inner rows of steps in the stope are formed, the open-pit mine officially enters the stage o...

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Abstract

The invention relates to a mining method of a nearly horizontal mineral deposit of an opencast coal field by casting and internally dumping and belongs to the mining method of the opencast coal field. The mining method comprises the following steps: (1) dividing a strip mine into a plurality of mining regions, mining overburdened materials of a first strip region, and stacking the overburdened materials outside an opencast mining limit; (2) dividing an overburdening table into one or more tables to be mined; (3) discharging the overburdened materials of a second strip region into a worked-out section of the first strip region after a mineral deposit exposed in the first strip region is mined, and transporting mined mineral products out of a mining field through entering-exiting channel transporting passages arranged on two sides of a channel or the middles of the strip regions. The mining method has the advantages that as the overburdened materials can be discharged and abandoned in the worked-out section, the occupied land of an externally-dumped soil site can be saved; the mining method is environment-friendly and is capable of restoring the land influenced by the mining operation during mining; abandoned and unserviceable lands in barren and mountainous mines can be changed into usable lands.

Description

technical field [0001] The invention relates to a mining method of an open-pit coal field, in particular to a mining method of a near-horizontal ore bed in the open-pit coal field by upside-down and internal drainage. Background technique [0002] Most of the large-scale open-pit coalfields developed in my country since the 1980s are near-horizontal coal seams with burial depths ranging from tens of meters to hundreds of meters. Generally, the area of ​​occurrence is relatively large, with a radius of tens of square kilometers, and mining methods are mostly adopted . Compared with underground mining, the main disadvantage of open-pit mining is that it needs to remove a large number of strippings covering the ore deposit, and most of these strippings need to be discarded outside the boundary of open-pit mining, occupying a large amount of cultivated land, causing strippings to be transported far away. increase, the cost rises. Contents of the invention [0003] Technical p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21C41/28
Inventor 姬长生
Owner CHINA UNIV OF MINING & TECH
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