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Table 2.7-4. Changes in particle size of Trapper Mine overburden from artificial <br />weathering, 1974. <br />Portion Of <br />The Permit <br />Area <br />Type Of <br />Material <br />Changes in <br />+4.76 mm <br />% <br />Increase in <br />-0.053 mm <br />% <br />Western <br />sandstone <br />54 <br />16 <br />siltstone <br />shale <br />70 <br />37 <br />Eastern <br />sandstone <br />62 <br />21. <br />siltstone <br />shale <br />76 <br />48 <br />Both <br />All Types <br />69 <br />34- <br />2-366 <br />