When mining the level and gently tilting the ore body, the stage is generally not divided in the well field, but the well lane is divided into several rectangular sections, called the panel. The extent of the panel is the long side of the boundary of the mine field, and the distance between the adjacent two lanes is the wide side (Fig. 2).
The mining area is part of the panel. The panel is divided into several independent mining units according to a certain size in the panel, which is called the mining area, and the mining area is the most basic mining unit of the horizontal and slightly inclined ore body.
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