Problems in coal mining
If the coal seam reaches a fault, the seam may be significantly displaced, depending on the type of fault and its offset. Machinery trying to mine the coal may not be able to reach the displaced seam, if the displacement is too large. Coal mines use a combination of boreholes and high-resolution seismic reflection data to identify the larger faults and avoid the most faulted areas at the mine planning stage.
If the water table is too high, the mine will flood with water. While mining, water needs to be constantly pumped out and this is expensive.
Thickness of seams
If the seams are too thin it may be uneconomical to mine the coal. The cost of production could exceed the selling price.
Splitting of seams
- Cocker, J.; Urosevic, M.; Evans, B. (1997). "A High Resolution Seismic Survey to Assist in Mine Planning". In Gubins A.G. Proceedings of Exploration 97: Fourth Decennial International Conference on Mineral Exploration (PDF). pp. 473–476. Retrieved 2009-11-17.
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