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Drill Hole #GW-N5 <br /> Nucla Mine, Montrose County, Colorado <br /> Date Drilled: 3/2/77 <br /> Depth Thickness <br /> (Feet) Strata (Feet) <br /> 0 Surface soil 1.0 <br /> 1.0 Brown damp clay 2.1 <br /> 3.1 Hard sandstone 1.0 <br /> 4.1 Brown soft sandstone 5.9 <br /> 10.0 Brown gray clay 8.1 <br /> 18.1 Hard sandstone 0.9 <br /> 19.0 Shale and sandstone 1.0 <br /> 20.0 Gray shale 2.0 <br /> 22.0 Gray sandstone 3.0 <br /> 25.0 Dark gray shale 2.2 <br /> 27.2 Coal 2.0 <br /> 29.2 Shale and coal #1 (U. Dakota) 0.1 <br /> 29.3 Coal 0.3 <br /> 29.6 Shale 1.0 <br /> 30.6 Gray soft sandstone 7.1 <br /> 37.7 Gray shale 1.3 <br /> 39.0 Coal 0.6 <br /> 39.6 Shale #2 (L. Dakota) 0.3 <br /> 39.9 Coal 5.0 <br /> 44.9 Dark shale 0.7 <br /> 45.6 Sandstone 2.0 <br /> 47.6 Gray shale and sandstone 1.4 <br /> 49.0 Hard gray shale 3.6 <br /> 52.6 Hard sandstone 1.0 <br /> 53.6 Sandstone with shale streaks 3.0 <br /> 56.6 Gray shale 3.0 <br /> 59.6 Shale and sandstone 1.4 <br /> 61.0 Gray shale with hard streaks 2.0 <br /> 63.0 Shale and sandstone 1.4 <br /> 64.4 Gray shale 2.5 <br /> 6-1 -46 <br />