Laserfiche WebLink
<br />The "mineable reserve base" for the B and D Seams was estimated by planimetering the mineable B <br />and D Seam isopachs within the boundaries discussed previously. Table 4-5 is a summary by lease of <br />the mineable reserve base of the B and D Seams. <br />' 4.3.3 Recoverable Raw and Clean Cnal Reserves The "recoverable coal reserves" of the Deserado <br />' Mine Logical Mining Unit as defined in the Code of Federal Regulations is the remaining raw coal <br />tonnage which is expected to be produced in accordance with the B and D Seam mine plans. This <br />reserve category is herein referred to as recoverable raw coal reserves to differentiate this category from <br />' clean coal reserves. Clean coal reserves are actually the expected saleable coal product from the <br />Deserado mine in accordance with the B and D Seam mine plans. Total recovered clean coal production <br />' to 5/31/91 from the Deserado Mine was 6.644 million tons. <br />The recoverable raw coal reserves for the B and D Seams is the "mineable reserve base" minus the coal <br />left ut place for support (such as pillars, fenders, barrier pillazs, etc) and minus the coal which cannot <br />be mined economically or technically, and minus the coal already recovered. <br />The 13 and D Seam mine plans (Plates 7 and 8) show the areas to be mined. The seam with larger clean <br />coal reserve potential in the areas of thin interburden (less than 10 feet) was given priority and recovery <br />from that seam is planned. Coal in the seam with the least potentially recoverable clean coal reserves <br />in areas of thin interburden is considered non-recoverable. <br />Recoverable clean coal reserves will vary as the amount of in-seam partings vary. Therefore, Western <br />Fuels has applied different clean coal recovery rates to the B and D Seams in the different lease azeas <br />' to account for the variability of in-seam partings. Experience with mining and washing the D Seam <br />coal a.t the Deserado Mine indicates that clean coal recovery is 98% of the net coal thickness in the D <br />t Seam where net coal thickness is the D Seam thickness minus the thickness of any partings. Therefore, <br />recoverable raw coal reserves in the D Seam are based on net coal thickness. D Seam clean coal <br />reserves are 98% of the D Seam raw coal reserves. Recoverable raw coal reserves in the B Seam aze <br />' based on the mineable seam thickness and include parting thickness. Because of the relatively high <br />volume of parting in the B Seam in leases C-0?3703, D-047201 and COC 51551 the clean coal <br />' recovery is expected to be only 75 percent of the B Seam recoverable raw coal reserves. However, the <br />B Seam is cleaner in leases C-8424 and C-8425 and clean coal recovery is predicted to increase to 85 <br />percent. Because of thin interburden and better reserves in the D Seam, no coal will be recovered from <br />the B Seam in leases C-0126669 and C-44693. <br />32 <br /> <br />