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XVl. Concurrent Surface and Underground Mining ................ 31 <br />XVII. Operations on Alluvial Valley Floors ..................... 31 <br />XVIII. Operations on Prime Farniland .................... 35 <br />XIX. Mountaintop Removal ............................... 35 <br />XX. Operations on Steep Slopes ............................ 35 <br />XXI. In Situ Processing .................................. 36 <br />ii <br />