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0 2.04.6 <br />(3)(a)(iii)(E) <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 />• <br />PR -12 2.04-27- <br />11/1 dIto - <br />02/10 <br />