A. Abutment - In coal mining, (1) the weight of the rocks above a narrow roadway is transferred to the solid coal along the sides, which act as abutments of the arch of strata spanning the roadway; and (2) the weight of the rocks over a longwall face is transferred to the front abutment, that is, the solid coal ahead of the face and the back abutment, that is, the settled packs behind the face.
The Rutherford Hayes Tavern stood on the old road to Marlboro, with Chloe Smith Hayes as the pious and efficient proprietress. This is the best-known and well-described Colonial house in Brattleboro history---not only because the grandson was President Rutherford B. Hayes.
Publisher Summary. This chapter explains different ore handling procedures that may account for 30-60% of the total delivered price of raw materials and covers the processes of transportation, storage, feeding, and washing of the ore en route to, or during, its various stages of treatment in the mill.