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2.04.6 <br />( <br />to <br />The clay content in the roof, interburden and floor is quite low ranging <br />between 7 and 12 percent. Therefore, engineering properties of clay and <br />clay shale in the stratum immediately above and below the coal seam to be <br />mined is not deemed necessary. <br />PR-12 2.04-27- 02/10 <br />