A mining method for thick and thin ore bodies

Abstract

The present invention relates to a mining method for thick and thin ore bodies, which is characterized by including the following steps: S1, when mining thick and thin ore, a preset original mining area boundary is set in the ore mining area at the junction of thick and thin ore. On the side of the thin and small ore body close to the original mining area boundary, the upward mining method is adopted, and the ore body is retained with a stepped widening during mining; S2, the thick and large ore body is mined by the downward mining method. The present invention avoids the influence of the over-limit ore room formed by mining the thin and small ore body on the thick and large ore body, ensures the safety of the downward slicing and filling method, eliminates potential safety hazards, avoids the loss of the thick and large ore body, has good popularization and application value, and can provide certain reference significance for the production practice of the same type of mines.

Description

Technical Field

[0001] The present invention belongs to the technical field, and specifically relates to a mining method for thick and thin ore bodies. Background Art

[0002] In deep mining of precious metal ores, the sublevel drift and fill mining method is often adopted. Due to the complex and variable ore bodies (such as stability, ore body shape, etc.), two or more mining methods are used to mine adjacent ore bodies.

[0003] In some mines, there is a continuous ore body, which can be divided into thick and large ore bodies and thin and small ore bodies along the strike direction of the ore body. Among them, the thick and large ore body is more fractured, and the downward sublevel drift and fill mining method (hereinafter referred to as the downward method) is used to mine in layers from top to bottom under the protection of a false floor. The thin and small ore body has better stability, and the upward sublevel drift and fill mining method (hereinafter referred to as the upward method) is used to mine in layers from bottom to top.

[0004] However, at the junction of the thick and thin ore bodies, due to the relatively fast mining speed of the upward method, and except for the first mining level, false floors are not set for the remaining levels, so that the thick and large ore body at the junction is mined near the filling body of the upward stope. Limited by the difficulty of accurately controlling the face position in stope mining, it is easy to exceed the boundary of the thick and thin ore bodies when mining the thin and small ore body, forming an overrun stope. As a result, when mining the ore body below the overrun stope by the downward method, there are great safety hazards in forced mining without the protection of a false floor, which will further cause ore loss.

[0005] Therefore, a layout method for the stepped stope division line of thick and thin ore bodies is proposed. By adjusting the mining area of the thin and small ore body through the stepped stope division line, the mining processes of the upward and downward methods are coordinated, and ore loss and roof safety problems caused by overrun stopes are essentially avoided. This method can ensure the safety and economy of mine mining at the same time, and has certain reference significance for the mining of the same type of ore bodies. Summary of the Invention

[0006] In order to overcome the problems in the background art, the present invention provides a mining method for thick and thin ore bodies.

[0007] To achieve the above object, the present invention is realized by the following technical solutions:

[0008] A mining method for thick and thin ore bodies, comprising the following steps:

[0009] S1. When mining the thick and thin ores, a preset original stope division line is set in the ore mining area at the junction of the thick and thin ores. The side of the thin and small ore body close to the original stope division line uses the upward mining method and retains the ore body with a stepped widening during mining;

[0010] S2. The thick and large ore body is mined by the downward mining method.

[0011] Further, the step width of the stepped-width reserved ore body in the S1 step is: 1.5 times the average footage distance per blast in the upward mining stope within the upward mining area.

[0012] Further, when the upward mining range is close to the stepped mining area boundary, the footage of the last blast should be reasonably adjusted in combination with measurement to avoid forming an over-boundary stope.

[0013] Advantages of the present invention:

[0014] It avoids the influence of the over-boundary stope formed by mining thin and small ore bodies on the thick and large ore body, ensures the safety of the downward slicing and drift filling method mining, eliminates potential safety hazards, avoids the loss of the thick and large ore body, has good popularization and application value, and can provide certain reference significance for the production practice of the same type of mines. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic diagram of the mining method of the present invention;

[0016] In the figure, 1, thick and large ore body; 2, thin and small ore body; 3, downward mining; 4, upward mining; 5, upward mining stope; 6, original mining area boundary; 7, over-boundary stope. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0017] In order to make the purpose, technical solution and advantages of the present invention clearer, the preferred embodiments of the present invention will be described in detail below to facilitate understanding by those skilled in the art.

[0018] Embodiment, a mining method for thick and thin ore bodies, comprising the following steps:

[0019] S1, when mining thick and thin ore, a original mining area boundary 6 is preset in the ore mining area at the junction of thick and thin ore. On the side of the thin and small ore body 2 close to the original mining area boundary, the upward mining 4 method is adopted and the ore body is reserved with stepped width during mining;

[0020] S2, the thick and large ore body 1 is mined by the downward mining 3 method.

[0021] In one embodiment, the step width of the stepped-width reserved ore body in the S1 step is: 1.5 times the average footage distance per blast in the upward mining stope 5 within the upward mining 4 area, so as to provide a redundant space for the uncertain blast effect of blasting.

[0022] In one embodiment, when the upward mining 4 range is close to the stepped mining area boundary, the footage of the last blast should be reasonably adjusted in combination with measurement to avoid forming an over-boundary stope 7.

[0023] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention rather than to limit them. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in terms of form and details without departing from the scope defined by the claims of the present invention.

Claims

1. A mining method for thick and thin ore bodies, characterized in that, The following steps are included: S1. When mining thick and thin ores, a preset original mining division line is set in the ore mining area at the junction of thick and thin ores. On the side of the thin and small ore body close to the original mining division line, the upward mining method is adopted, and the ore body is retained with a stepped widening during mining. S2. The thick and large ore body is mined using the downward mining method. In the step S1, the stepped width of the ore body retained with a stepped widening is: 1.5 times the average footage distance per blast during blasting in the upward ore room within the upward mining area.

2. The layout method of the stepped mining area demarcation line for thick and thin ore bodies according to claim 1, characterized in that: When the upward mining range is close to the stepped mining division line, the footage of the last blast should be reasonably adjusted in combination with measurement to avoid forming an overstepped ore room.

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