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1.0 INTRODUCTION <br />This report presents the ground -water and surface -water monitoring results for Trapper <br />Mine for 2012. Mining activities during 2012 include continued expansion of the Kimber (K) and Z <br />pits. The all other pits were not mined during 2012. Pit dewatering was conducted in the Z and G <br />pit areas in 2012. Well dewatering was used in 2012 in the G pit area. <br />Ground -water monitoring of the aquifers associated with Trapper Mine started in 1974. <br />The ground -water flow regime has been divided into the major sandstones and coal/adjacent <br />sandstone aquifers. This division of the aquifer systems was selected at clay and shale units, which <br />have the potential to retard vertical movement. A pull -out index presents the schematic of the <br />aquifer units at Trapper on one side and the basic well data table on the other. It is suggested moving <br />this index sheet to the section of the report being reviewed. Aquifer properties are presented in <br />Table 2 -1 of the 1990 Annual Hydrologic Report. <br />The Twenty Mile Sandstone is the first major sandstone below the mined coal seam at <br />Trapper Mine. The U coal seam and adjacent sandstones is a minor aquifer between the mined coal <br />seams and the Twenty Mile Sandstone. The Q and R coal seams and sandstone between these two <br />coal seams have been labeled the QR aquifer. This is one of the major aquifers of interest because <br />C, D, E, F, G, K and Z pits have mined the Q and/or R coal seams, currently the K and Z pits mine <br />the Q seam and the K pit also mined the Q and R coal seams. The K, L, and M coal seams and the <br />sandstones, which are stratigraphically in this interval, are called the KLM aquifer. In 2012, the K <br />pit mines the H, I, I1, 12 K, LK, ML, LL, M, MM, LM, Q and R seams and the Z pit mines the Q <br />seam. The KLM aquifer is above the QR aquifer, but below the HI aquifer. The H and I coal seams <br />and sandstone between these two coals have been termed the HI aquifer and have been mined in the <br />past in the A, B, F, G, K and Z pits, currently the K pit mines the H, I, I1, and 12 coal seams. The D <br />Trapper Mining Company 1 -1 <br />2012 Annual Report <br />