2010-03-15_REPORT - C1981022 (2)

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• D2B2 The D2B2 borehole was completed in December 2005 in the vicinity of the Hubbard Fan. Water transfer started during early 2006. The bottom 39' of the 338' borehole is uncased. The B seam coal roof was encountered at 6046' elevation. After initial water transfer, initial water level was encountered at 6053' elevation, or 7' above the coal. Subsequent measurements encountered an apparent dry borehole obstruction at the 6070.7' elevation or 24' above the coal. The obstruction has not precluded water transfer, but has limited the ability to lower the sounder past the obstruction. During 2008, the sounder encountered more favorable conditions and a water level appeared at the 6064' elevation. During 2008 the underground pumps ran very little. On October 12, 2008 the 13 West gate road was sealed, the Hubbard fan dismantled, the shaft sealed with earthen materials and the western mining district sealed off. Pumping of water to D2B2 was also concluded. Water Level (Elevation Ft.) Date D2B mu? • LJ January 14, 2005 6044.0 January 19, 2005 6044.0 _ February 22, 2005 6044.6 _ March 31, 2005 6043.6 _ May 3, 2005 6044.0 _ June 15, 2005 6044.5 _ Jul 11, 2005 6043.6 _ Au ust 24, 2005 6044.6 _ October, 17, 2005 6045.0 _ April 19, 2006 - 6053 May 25, 2006 6047 _ June 7, 2006 - 6066.7 Jul 26, 2006 6047 6070.7 October 17, 2006 6045 _ December 27, 2006 6047 6070.7 May 23, 2007 6047 Indeterminate June 19, 2007 6049 Indeterminate August 16, 2007 6049 Indeterminate June 18, 2008 6052.5 6063 -September 11, 2008 6064 October 15, 2008 6051 March 16, 2009 6047 Borehole is sealed. June 16, 09 6060 Borehole is sealed August 4, !2009 6060 Borehole is sealed October 26009 6059 Borehole is sealed The data suggests that changes to B seam water level have occurred likely not only from mine water transfers but natural sources as well. See also the discussion regarding the H-10 well 14