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.hmimr.v 15. 008 Page 53 <br />expected to be coal left unmined in the harrier pillars. Similarly, East-Panel should achieve <br />historical resource recovery based on what is known about ground conditions to date. <br />Historical recovery of coal reserves in the landslide area is not anticipated. Some coal <br />seams have been rtrbblized and mixed with the interburden. In other areas, effective interburden <br />cleaning may not be possible without influencing coal quality. To estimate the recoverable <br />reserves, the K-Pit and G-Pit areas were evaluated relative to their degree of influence from the <br />landslide. Estimates of the recoverable reserves are given in Table 6 by seam. <br />Table 6. Estimate Recoverable Reserves from Landslide :krea <br /> Percent Recoverable Reserves <br /> Inside 83 Acres Minor In 49 Acre Major <br />Seam Disturbance Area Disturbance Area <br />tl-Seam. II -Seam, and 11-Seam ?5°o t I °n 00. `. 10°b <br />K - Seam 500'oi 1000 10°0+ 15% <br />L - Scam Woe 5% 55001- IOoo <br />N1 - Scam 990.0 9900 <br />Q Seam 9900 9900 <br />The disturbed area of the landslide has been estimated to be about 267 acres. <br />Approximately 22 acres (8%) is piled toe material for which no reserves are recoverable. The <br />remaining 245 acres (thick green line in Figure 37) consist of' landslide block and rubble above <br />the slide plane. About 1 13 acres of rubble area (46°i0) is thought to exist where the coal is <br />completely intermixed with rock and for which no reserves are recoverable above the slide plane.. <br />The 132 acres within the landslide block (thick cyan line in Figure 37) is thought to <br />contain ground with variable amounts oI'disturbance. Recovery ofthe If-. II-. 12-, and K-Seams <br />coal seams will be influenced by this disturbance. Material inside the red line area in Figure 32 is <br />thought to have the least disturbance. This area accounts for about 83 acres. Excavated slopes in <br />this area will likely be more irregular than a typical highwall. Open joints will be visible and <br />small blocks in the face may be less stable than normal. The coal seams in these areas are <br />expected to be continuous, but the interburden should he carefully cleaned so that spoils do not <br />intermix with the coal. <br />Material in the area between the cyan and red lines in Figure 37 is expected to have <br />experienced more disturbance than inside the red lines. This area is approximately 49 acres and <br />includes the H-, l l-, 12-, and K-Seams coal reserves. Only a small percentage of, the reserve in <br />this area will be recoverable due to spoil intermingling when interburden is removed. Sub- <br />vertical joints in the sandstone units are likely to be wide open (as observed in the borehole <br />camera) so tines disturbed by cleaning can easily intermingle with the coal. <br />Reserve recovery below the slide plane is expected to be favorable. Drilling indicates <br />that the interburden below the landslide is essentially undisturbed. The only exception might he <br />immediately adjacent to the old G-Strike Pit. This area might be influenced by previous <br />highwall failure disturbance and, thus, difficult to excavate without intermingling spoils with the <br />reserves. <br />Agapito Associates. Inc.