... pit must be spread out and rehandled on succeeding cuts . Another method is to dig a borrow pit adjacent to and parallel to the box cut as a means of handling the over- burden from the box cut . Figure 36 shows three methods of opening ...
User's Manual for Premining Planning of Eastern Surface Coal Mining
... stripping ratio . In actual practice , a mine's stripping ratio will vary from year to year and likely will approach some upper limit late in life , beyond which the mine can no longer be operated profitably . The strip ratio suggested ...
11th US/North American Mine Ventilation Symposium 2006: Proceedings of the 11th US/North American Mine Ventilation Symposium, 5-7 June 2006, Pennsylvania, USA
... development were started. The orientation of the belt entries in the tailgate and headgate sections created a situation where a degasification longhole could not follow the typical plan of drilling with the wellhead in the return entry ...
User's Manual for Premining Planning of Eastern Surface Coal Mining
... solubility of these reactant and product substances is critical to the problem . Solubility levels are detailed as follows : FeS2 FeSO4 · FeO ( Fe ( OH ) 2 ) Fe203 ( Fe ( OH ) 3 ) 2 FeCO 3 * Fe ( SO4 ) 3 · · • • • • · g / l ( Handbook ...
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