Actually in the mining enterprise, one or several mines are set up under the mining bureau or under the company; and one or several pits are set under the mine, and each pit is an independent mining system and an independent production unit.
According to this relationship, the minefield, minefield and mining area are divided into:
(1) An ore body classified as an open pit, called a well field;
(2) All deposits placed under a mining company mined ore field or part of call; (such as gold Ridge iron ore, gold and other Zhaoyuan)
(3) An ore body that is assigned to a company or mining bureau, called a mining area. (Northwest District, Central District, Southeast District) (such as Yangzhangzi Mining Bureau, Zhongtiaoshan Nonferrous Metals Company, etc.) (Changling Mine is divided into three minefields)
A mine field can include several well fields, and sometimes a mine field equals one well field.
(The Gongchangling Mine is divided into two layers of ore bodies, and the three or three layers of the three or three layers of the ore are not yet taken. The upper iron ore zone is divided into three well fields. The upper and lower iron belts are separated by 80- - More than 200 meters. The northwest mining area is opened for Pingdong Shajing, the central area is open for Pingdong shaft, and the southeast area is not mined. The mining area is divided into three mines: old sky, single wood and high mountain.
(2) Size range of the mine field
The size of the mine field is an important parameter in the mining of the mine.
(1) For inclined and steeply inclined deposits, the size of the well field is generally expressed along the strike length and along the inclined length or vertical depth H.
(2) For horizontal and slightly inclined deposits, the length L and the width B are used.
(3) When the scope of the deposit is small and the ore body is relatively concentrated, for the convenience of production management, a well field can be used for mining.
(4) When the scope of the ore body is large, or the ore body is relatively scattered, if all the deposits are still mined with one well, the amount of roadway excavated is large, and the production location is too scattered, which will cause economic unreasonable. Several well fields can be mined.
(5) Several aspects should be considered when dividing the mine field
1 Take care of natural conditions and surface topography. It is often divided by rivers, lakes, railway trunks, reservoirs, etc. on the ground (or such as Yangzhangzi Mine, Dabeiling and Siqian Mine) because there is a non-mineral belt in the middle of the upper two ore bodies, it is divided into two according to the non-mineral zone. In part, the Songbei Mine is separately classified as a well field because of the distance. (The bow mine is divided into three well fields, the main mineral quality is <chi and magnetite> and one ditch is divided, and the upper iron and lower iron are included. The belt is also mined in different well fields because of the large distance between the top and bottom.
2 Take care of the convenience of production management. 3 Take into account the needs of the national economy. 4 Consider the rationality of the technical economy.
In short, a comprehensive analysis is required.
[Reference content] The concept of the orientation and tendency of ore.
(1) The strike line—the intersection of the level of the rock formation and the horizontal plane is called the strike line of the rock formation. (For an irregular ore body, the intersection of the ideal center plane of the ore body with the horizontal plane is called the strike line of the ore body).
(2) Stride—The horizontal azimuth of the strike line is called the strike (since the strike line is a line on the plane, it can be used to indicate its direction from the angle it is in the north direction. For example, a rock outcrop is in the geological plan The upper direction is 60o (NE60), which means that the rock formation is 60o from the north.
(3) Long-going—The length of the ore body along the strike is called the longitude of the ore body.
(4) Inclined line—The line that runs vertically in the plane of the rock is called the inclined line.
(5) Inclination - The direction of the inclined line is called tilt (or tendency).
(The tilt is also expressed by the angle between the projection of the oblique line on the horizontal plane and the true north or the south, and the projection of the strike and the tilt in the plane is in a vertical relationship.
(6) Inclination—The angle formed by the inclined line and the horizontal plane is called the inclination angle. That is, rock level and water 
The angle formed is called the inclination of the rock formation.
(7) Concepts of deepening, burying depth and depth of occurrence
a) Depth - refers to the distribution of ore bodies in depth. It can be expressed by the depth of the tunnel and the depth of occurrence.
b) Buried depth (h) - refers to the depth (h) of the upper boundary of the ore body to the surface.
c) Depth of occurrence (HO) - refers to the vertical or oblique distance from the upper limit of the ore body to the lower limit.
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