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! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! G245 G214 G211 G213 G218 G216 G212 WC4511 89 88 87 90 86 W650 W646 W647 W648 W649 W645 G-241 G-247 G-244 T-244 T-250 (11) (12) (15) (14) l l l l l 101 o 52 ' 30 " 46 o 45 ' 00 " 102 o 00 ' 00 " 46 o 45 ' 00 " (CLARK BUTTE) (LAKE TSCHIDA EAST) (CLARK BUTTE NE) 101 o 52 ' 30 " 46 o 37 ' 30 " 102 o 00 ' 00 " 46 o 37 ' 30 " (LAKE TSCHIDA WEST) (HEAR T BU TTE) Cartographic Compilation: E. L. Kadrmas & S.S. Kranich North Dakota Geological Survey 24K: HrtB NW - C Edward C. Murphy, State Geologist Lynn D. Helms, Director Dept. of Mineral Resources Geologic Symbols This project supported, in part by the U.S Geological Survey, Department of Interior, under assistance awards 02ERAG0016 and 05ERAG0053. (HEBRON SE) (GLEN ULLIN) (GLEN ULLIN SW) Extent of Local Lignite Reserves Includes Coal Exploration NDGS/USGS drill holes, Sub-surface Mineral drill holes, Oil & Gas drill holes, and NDSWC drill holes. ! ( Data Points UNIT DESCRIPTIONS Geology Undifferentiated Economic coal deposits are those that meet the minimum criteria established by coal companies operating surface mines in North Dakota. These economic criteria include a minimum cumulative coal thickness of ten feet-typically occuring in less than two beds, a minimum individual bed thickness of at least 2.5 feet, a ratio of overburden to coal thickness of not more than 10:1, a minimum of 25 feet of overburden, and a maximum depth to coal of approximately 150 feet. Economic Coal Deposits l Lignite Reserves Heart Butte NW Quadrangle, North Dakota T. 1 37 N . T. 1 36 N . R. 90 W. R. 89 W. R. 90 W. R. 89 W. T. 1 38 N . T. 1 37 N . Drill Hole Numbers ! T-250 Coal thicknesses were determined by interpretation of electric logs from individual drill holes. Gamma and density logs were typically available for coal exploration holes but, oil wells were often limited to a gamma log run through surface casing. Thickness (in feet) of Mineable Lignite ! (14) Other Features Unpaved Road MN 1960 Magnetic North Declination at Center of Sheet 13 o 0 0.5 1 Miles Scale 1:24,000 Standard Parallels 46 o 37 ' 30 " and 46 o 45 ' 00 " USGS 7.5 M inute T opographic Map Con tour Interval 10 Feet Lambert Con fo rmal Co nic Projection 1927 North American Datum NGVD 1929 Road Layer Rectified to 2003 NAIP Digital Orthophoto Heart Butte NW Quadrangle, North Dakota Edward C. Murphy 2009
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