Minimum recoverable coal layer thickness and determine the boundary line
3. Limited inference method
There are two engineering sites, one of which sees coal and can be mined; the other does not see coal, and it is determined that it is caused by the gradual change of coal seam. At this time, the zero point and the lowest recoverable boundary point of the coal seam must be between the two engineering points, and the inferred range is limited, so it is called the finite inference method.
In this case, it is generally 1/2 of the distance between the two engineering points, and then the lowest recoverable point of the coal seam is inserted.
One of the prerequisites for this practice is that the coal seam is gradual, but if it is determined that the coal seam is not a gradual change but is abrupt due to river erosion, etc., what should be done? In this case, the distance between the two engineering points is generally three. One of the points is the flushing boundary, but the coal thickness is equal to the coal thickness at the coal engineering point.
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