Chapter III Basic Concepts of Open-pit Mining - Section 4 Open-pit Mine Engineering Development Procedures

As previously indicated, the recovery of ore and rock from open pits is accomplished by a process that is collectively referred to as open pit mining. The open pit mining project is divided into stripping engineering and mining engineering according to the object; it can be divided into trenching engineering and pushing engineering according to the construction form.

Under normal circumstances, the development of open pit mine projects must comply with certain procedures.

For a step, the development of mining engineering, first of all to dig into the ditch, as shown in the ABCD part of Figure 3-5. Then, based on this, the trench EFGH is opened and the transportation route is laid. After the trench is drilled to a certain length or the full length of the working line, the working surface FHIJ is placed on one side or both sides of the trench for pushing (mining or stripping).

For the upper and lower steps, when the previous step pushing work is carried out to a certain position (advance B distance in Figure 3-6), the next step of trenching and pushing can be carried out, so the mine works from the first One step is extended to the second step (AECD). In the future, the extension of each step will be carried out according to this procedure until it is extended to the final mining depth of the open pit.

It can be seen from the construction form that the development of the open pit mine project is a process of continuous trenching and pushing up from top to bottom in a certain level of open-pit mining.

In the same mining level, the trenches are digging into the ditch, and the trenches and pushes are opened, and Xi'an City is in turn; then some of the works can be paralleled and coincident in time; the direction of the working line is continuously pushed from one side to the other. Until the final exploitation of the realm.

See the upper and lower mining levels, the upper horizontal push and the lower horizontal trenching work are kept at the same time. The contour of the stope is gradually small to large, from shallow to deep, until the end of mining in the final boundary of the open pit mine (Figure 3-7).

The development of the organization of open-pit mine projects is to make the parallel operation time as long as possible under the conditions allowed to improve the speed of mine engineering.

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