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Mining method for outdoor quarry

A quarry and open-pit technology, applied in ground mining, earth square drilling, underground mining, etc., can solve problems such as increasing infrastructure costs, increasing production costs, and prolonging production time

Active Publication Date: 2017-09-15
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the bamboo shoot-shaped isolated peak deposit is exploited by steps, it will be difficult to build a safe uphill transportation road, and at the same time, it is difficult for each layered step to maintain a certain advanced relationship, so there are potential safety hazards, and the production scale of the bamboo shoot-shaped isolated peak deposit is generally small. mining will increase the cost of infrastructure and prolong the production time; if layered mining is used to mine the bamboo shoot-shaped isolated peak deposit, although it can save a lot of investment in the construction of the uphill transportation road while ensuring safety, after each blasting, some stranded The ore on the rock drilling platform needs to be transported twice, which will greatly increase the production cost

Method used

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  • Mining method for outdoor quarry
  • Mining method for outdoor quarry

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Experimental program
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Effect test

Embodiment 1

[0045] A limestone mining area is a low-mountain landform. The highest elevation of the mountain is +303.0m, the lowest elevation is +127.0m, and the relative elevation difference is 176.0m. The slope of the mountain slope is generally 60-80°, and the terrain is steep. It is located in mining area No. 8 to B The terrain at the turning point is relatively slow, and the mine has built an excavator uphill road to reach the +265m elevation of the mountain, with good transportation conditions.

[0046] The ore body between the +265~+220m elevation of the mine is mined by multi-layered millisecond blasting with a layered height of 15m and a total of 3 layers. Each layered rock drilling platform is divided into several ore blocks with a width of 6m and a length of 21m according to the order of mining. From the outside to the inside, they are 1, 2, 3, 4, 5...; each layered ore directly falls to the +220m shovel loading platform , It is shoveled by excavator and transported by car to the ...

Embodiment 2

[0092] Limestone ore body in a mining area is a medium-thick layered limestone of the Lower Permian Maokou Stage (P1q), distributed in the entire mining area, directly exposed on the surface, with an average length of 205m, a width of about 140m, and an elevation of +312.3~+ 205.0m. The natural slope of the surface is generally about 35-55°, and locally greater than 55°. The ore is of medium-hard grade. The limestone deposits are distributed on the steep slopes of the mining area, directly exposed on the surface, suitable for open-pit mining.

[0093] 1. Development

[0094] Build the excavator uphill path to the top of the mountain +312.3m, cut the top to form the initial platform for rock drilling with an elevation of +310m, and develop layered rock drilling platforms at the elevations of +295m, +280m, +250m, +235m, and +220m. Excavate the shovel loading platform at +265m and +205m.

[0095] The ore body between +265~+310m elevation is mined by multi-layered millisecond blasting...

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Abstract

The invention provides a mining method for an outdoor quarry. Ore extraction is carried out by adopting a multi-layered explosion manner, so that most of caved ores are successfully thrown to a mucking platform on the lowest layer, few cores are retained on a drilling platform, the disadvantage that secondary transferring of the retained cores is needed in a layered explosion manner is overcome, and the production cost of a mine is greatly reduced; and after explosion, a new multi-layer layered drilling platform is formed synchronously, the safety of subsequent drilling operation and shovel mucking operation is guaranteed, and the potential safety hazards of rolling stones and falling caused by high and steep slopes are also eliminated. Experimental result indicates that after explosion by adopting the mining method for the outdoor quarry provided by the invention, the quantity of cores retained on the drilling platform is reduced by more than 90%.

Description

Technical field [0001] The invention relates to the technical field of mineral deposit mining, in particular to a method for mining in an open quarry. Background technique [0002] At present, open-pit mining occupies a pivotal position in the mining industry. According to statistics, open-pit mining accounts for two-thirds of the world's mineral resources. Modern mechanized open-pit mining methods are mainly distinguished according to characteristics such as the occurrence state of ore bodies, topographical and geomorphic conditions, and the stacking position and quantity of stripped objects. In open quarry mining, the main mining techniques are step mining and layer mining. [0003] Step mining divides the ore rock into several horizontal layers according to a certain thickness, and mines it layer by layer from top to bottom, and maintains a certain advanced relationship; when stepping mining, it is used to transport the mined rock out. In the stope, at the same time, the minin...

Claims

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Application Information

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IPC IPC(8): E21C41/30F42D3/04
CPCE21C41/30F42D3/04
Inventor 李学锋
Owner GUANGXI UNIV
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