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i <br />~.. <br />ATTACHM1tENT 6 <br /> Table 4a. Changes in particle size of overburden from artificial weatherine <br /> <br /> Changes in Increase in I <br /> Type of +4 mesh -270 mesh <br /> Panel Material Z 7. <br /> <br /> West sandstone 54 16 <br /> <br /> siltstone <br /> shale 70 37 <br /> Fast sandstone 62 21 <br /> <br /> siltstone <br /> shale 76 48 <br /> Both All types 69 34 <br />• <br />\ <br /> <br />,i <br />16 <br />