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<br />TABLE 4-3
<br />ESTIMATED PRODUCTION RATE (1994-2021)
<br />(TONS OF RAW COAL)
<br /> D SEAM B SEAM TOTAL
<br />1994 1,300,000 - 1,300,000
<br />1995 1,500,000 - 1,500,000
<br />1996 1,500,000 - 1,500,000
<br />1997 1,500,000 - 1,500,000
<br />1998 1,500,000 - 1,500,000
<br />1999-2003 4,764,000 2,736,000 7,500,000
<br />2004-2008 - 7,500,000 7,500,000
<br />2009-2013 - 7,500,000 7,500,000
<br />2014-2018 - 7,500,000 7,500,000
<br />2019-2021 - 3,418,000 3,418,000
<br />TOTAL 12,064,000 28,654,000 40,718,000
<br />4.2.7 Recovery Factors Recovery factors vary among different main and gate roads,
<br />room-and-pillar panels and longwall panels.
<br />' Only 36 to 39 percent of coal is recovered from the main or gate roads depending upon the numbers
<br />of entries being developed. The higher the number of entries, the lower the recovery factor will be.
<br />A three-entry gate road renders to a 39 percent recovery factor. This factor is 36 percent for a
<br />six-entry main road.
<br />' In the room-and-pillar panels, the final recovery, i.e. the ultimate pillar size that can be safely
<br />extracted, depends upon the overburden thickness and the seam thickness. The recovery factor
<br />' decreases with increasing overburden and/or seam thickness. In the Deserado Mine, this factor is
<br />estimated at 64 percent.
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<br />t (Rev.3/30/95) 27
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