The preparatory works before the mining of stone mines mainly refer to the ore body development works, stripping works and the propulsion work of mining preparation trenches.

Procedure. These three projects are generally carried out in sequence, and can be carried out at the same time only when the conditions for simultaneous progress are met.

I, in order to speed up the progress of the engineering style. The development of stone open-pit mines refers to excavating the ground and each level in a certain way.

It is a project of establishing a transportation system connecting the stone quarries and the transportation ground. Stone mines mined with bead saws

Mountains, according to the natural conditions of the ore body, generally adopt the methods of road transportation development, no cutting ditch development and joint development. stripper

The process mainly refers to removing the overburden on the upper part of the ore body and the surrounding rock, so that the bedrock is exposed, so that the formal mining can be carried out. open

The development and advancement of Caiyabei Gully is described in detail in Chapter 4 "Technology of Mining Marble with Beaded Saw". Discuss below

On the development of open-pit stone mining in hillside, open-pit stone mining in depression and underground stone mining using bead saw

Engineering, stripping engineering.

1. The development of open-pit mining on hillsides _ For open-pit mines located in hilly areas and the depth and topography are not very different

When preparing, it is recommended to adopt the method of road transportation to open up the entrance ditch. According to the relationship between the development road and the ore body, the entrance cut ditch can be

If it is arranged on one side of the ore body or the strike length of the middle ore body is long, the working line can be divided into the middle of the left and right stope subs.

The flank type can be used if the vertical length of the ore body is short. When transporting by road, the slope of the road should generally not exceed

8~10%, the radius of the plane curve should be greater than 25 meters. Compared with other development methods, the development of entrance cut ditch is easier and less expensive to construct.

Low and quick. .

For hillside open-pit mines with large mining scale and terrain conditions suitable for highway exhibition lines, straight-forward mines in road transportation development can be used.

Trunk development method. A transport system connected to the ground by level (steps). The advantages of the straight-forward trunk development method are:

The car drives directly into the operation level step, there is no intermediate reverse transport link for blocks and gravel, and it can be continuously transported; multiple horizontal steps

The working surfaces on the top can be operated at the same time without catching up with each other without interfering with each other; the transportation and working position of the bead saw and other auxiliary equipment are easy to change;

The transportation capacity of materials, gravel and waste residue is large; large-scale blocks can be transported by high-ton trucks. The disadvantage is that the construction of road lines is long

Fees are high.

In open-pit mines with very steep hillsides, the mast crane development method in the development of trenchless trenches can also be used. terrain elevation

When it is not large, the mast crane can be installed on the ground level, and the lifting operation method is adopted; when the mast crane development method is used, the bead saw and its

Auxiliary equipment can flexibly move between different mining planes, and the lifting capacity of the mast crane is large, so the lifting equipment

Deaf and dumb waste materials, and the shipment of gravel is also very convenient. This is a simple development method with short construction time and quick results;

After production, the mast crane can be used continuously; the mechanical structure of the mast crane is simple and easy to maintain and has strong adaptability to each operation. The downside is

After a certain period of service, it is necessary to displace the mast hoist.

2. The development project of open-pit mining in sags The mining method of open-pit mining in sags should be developed in the way of ditch development. If the ore body is extremely

If it is inclined, the mast crane can be installed on the working side-side; if the ore body is horizontal or relatively flat, the mast crane should be installed on a non-

Working side - side. In order to reduce the number of displacements of the mast crane and increase its service life, when the mining operation face is moved to the boom of the mast crane

When outside the effective working radius, a slow-moving hoist can be installed in the stope or a front-end loader, a large forklift, etc. can be used to assist in reverse transportation

Equipment to assist in dragging or moving the blocks to the working range of the mast crane boom, and then use the mast crane to hoist them to the ground for flat stacking in the inland river

Or directly loaded and transported away. There is also a development method for sag open-pit mining rights, that is, the cable crane development method.

Between the two brackets installed on both sides of the body, the company's one-drum support cable is installed, and the hoisting block is pulled within the span under the traction of the quail cable.

Reciprocating movement on the support cable. The tool can be lifted or lowered along the sling of the tackle. The advantage of this pioneering method is that it requires less investment,

Fast efficiency, large working range, simple equipment and low operating costs. Since the lifting capacity of the sling is generally less than 3T, the movement range is

The perimeter is also limited, and the blocks produced by the mines that use the bead saw as the mining equipment are relatively large, so the cable crane type development

The formula does not apply to stone mines mined with bead saws.