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2018-09-04_PERMIT FILE - C1980007A (44)
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2018-09-04_PERMIT FILE - C1980007A (44)
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Last modified
2/24/2022 2:08:23 PM
Creation date
1/3/2019 9:07:35 AM
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DRMS Permit Index
Permit No
C1980007A
IBM Index Class Name
Permit File
Doc Date
9/4/2018
Doc Name
2.04-12 Thru 2.04-50
Section_Exhibit Name
2.04.6 Geology Description
Media Type
D
Archive
Yes
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West Elk Mine <br /> B Seam Lithology <br /> The B Seam typically comprises three coal benches separated by persistent rock partings. The <br /> coal benches have been designated in descending sequence as B1, B2, and B3 (Figure 6). All <br /> three benches are present in the permit area with varying thickness. <br /> In other areas of MCC's lease holdings the minable portion of the B Seam occurs at the top of <br /> the seam where the B1 and B2 benches are closely associated and attain sufficient combined <br /> thickness. In these areas, the upper coal benches are thinly separated by a parting informally <br /> called the "Marker Parting" and formally designated as the MI Parting. The M1 Parting in the <br /> permit area varies from 0.2' in the north to 29.6' in the south at hole MG-15, Its irregular <br /> occurrence may preclude or limit the potential for longwall mining. <br /> The M2 Parting is also present in the B Seam within the South of Divide permit area. The M2 <br /> Parting develops in the upper section of the B2 coal bench typically 1.5' to 2.0' below the M1 <br /> Parting, decreasing the mineable bench of coal to the lower B2 bench. The M2 Parting has been <br /> encountered previously in the B Seam reserve in the Jumbo Mountain and Box Canyon leases. <br /> Parting composition varies from bone and carbonaceous mudstone on the fringes to fine-grained <br /> siltstones and sandstones as the parting thickens. In the Box Canyon reserve, the M2 Parting at 0.5' <br /> or greater in thickness defines the mineable boundary for longwall mining using current technology. <br /> Beneath the B2 coal bench, a thick rock parting separates the mineable portion of the B Seam <br /> from the lowermost, impure B3 coal bench (Figure 6). Because of its position near the base of <br /> the mining interval, this parting is informally called the "Lower Parting." The underlying B3 <br /> coal bench contains numerous bone and shale partings, and as a result, is not of salable quality. <br /> This coal bench grades downward and laterally into a carbonaceous shale. The contrast in coal <br /> quality between the upper, mineable portion of the B Seam and the impure, lower bench is <br /> shown in Table 2, along with the average as-shipped quality of the B Seam from the Box Canyon <br /> reserve and the E Seam from the South of Divide reserve. <br /> Table 2 Average Coal Quality <br /> Upper Lower Product Quality <br /> Parameter B Seam B Seam B Seam E Seam F Seam <br /> In situ In situ Actual Projected Actual <br /> Moisture %) 7.7 7.8 8.5 12.1 10.0 <br /> Ash(%) 7.1 16.8 9.5 7.2 9.7 <br /> BTU (%) 11,900 10,800 11,900 11,250 11,300 <br /> Sulfur(%) 0.6 0.4 0.7 0.4 0.5 <br /> Note: As Received Basis <br /> As Shipped Basis <br /> 204-23 Rev.11/04-PRIO,03/18-PR15 <br />
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