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downward through an unsaturated zo.ne of the Mesaverde , which <br /> • extends downward to an elevation of about 8 , 000 ' , or under <br /> around 3 , 000'-3 , 500 ' of overburden. <br /> Some recharge also results from percolation <br /> of water vertically downward through joint and fracture <br /> systems in the overlieing rock near the area of outcrop . <br /> Water entering the Mesaverde generally migrates <br /> down-dip to the west and northwest . <br /> Currently, ground water is entering the No . <br /> 1 , No . 4 and No . 5 mine entries . Some of this water comes <br /> directly from precipitation entering through the portals , <br /> some from ground water migrating down dip through the un- <br /> saturated portion of the Mesaverde sandstone and , probably , <br /> • the greatest portion from direct seepage down faults and <br /> along joint systems from the surface . <br /> The strata of the coal bearing Mesaverde <br /> formation outcrop around the basin. Depths , therefore , vary <br /> from the point of outcrop to the area of underground workings . <br /> Because the depth from surface to underground workings is <br /> expected to remain constant in the future , due to the tendency <br /> of the overlieing surface to parallel the dip of the coal <br /> seams which will be mined , the approximate depth of the <br /> respective strata has been estimated for the area of under- <br /> ground workings as indicated in Table III-D-1 . <br /> C . Overburden. removal <br /> tl. <br /> 32 <br />