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Table3— Deere's classification based on RQD <br />RQD Description of rock quality <br />0 -25 <br />Very poor <br />25 -50 <br />Poor <br />50 -75 <br />Fair <br />75 -90 <br />Good <br />90 -100 <br />Excellent <br />Figure 13 presents an RQD profile along the axis of TC- 03 -02. Clearly RQD values are <br />low near the cleated B Seam but rapidly increase into the roof. The C- Sandstone (Upper <br />Marine Sandstone), located some 140 -ft above the Upper B Seam, has excellent rock <br />quality. Because of lateral consistency of this unit, this sandstone will contribute <br />significantly to the stability of the overburden. <br />• <br />0 <br />• <br />Maleki Technologies, Inc. Page 23 <br />