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MORRISON-KNUDSEN COMPANY,INC. <br /> impurities and carbonaceoLl's shale (bone) . In general , refuse from such <br /> a coal washing process is likely to contain very little coal . <br /> 1 .3.2 Transportation and Placement <br /> The hydrologic and strength characteristics of a refuse pile depend, <br /> to a large extent, on the mode of transportation and placement of the re- <br /> fuse. In the Mid-Continent operation, the fine and coarse fractions of <br /> the refuse are combined in the plant and transported by a conveyor belt <br /> to the edge of the refuse pile. A dozer spreads the refuse in layers on <br /> the surface of the refuse ,pile. The ground is cleared of all vegetation <br /> before refuse is deposited on it. The above method of transportation and <br /> placement is a desirable one, as far as stability of the refuse pile is <br /> concerned, because of the compaction inherent to the process of bulldozer <br /> spreading. <br /> C• 1 .3.3 Material Characteristics <br /> As mentioned above, the refuse contains both fine and coarse fractions <br /> in a so-called "closed system" of disposal . A closed system of disposal <br /> generally results in a refuse material which is much harder to define phy- <br /> sically than in a system where the coarse and fine fractions are placed <br /> separately. An indication of the material size involved was given by re- <br /> results of sieve analyses 'performed on the samples collected at the combined <br /> coarse and fine refuse discharge onto the final refuse belt. The analyses <br /> was performed by Mid-Continent' s coal washing plant personnel . Table <br /> 1 .3.3-1 shows the average sizes of the refuse samples. From fieldgobser- <br /> vation, it is expected that, due to the mechanical actions of belt dis- <br /> charge, front-end loader and dozer operations, and finally loading under <br /> its own weight, there is further reduction of size of the refuse material . <br /> 1 -5 <br />