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R. 100 W. ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! !! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! M146 BU028 IH8326 IH8327 IH8323 IH8328 IH8322 IH8324 6C 6P 5C 5P 31 30 4C 4P 8C 8P 1P 1C 7P 7C 2C 5P 3C 3P P1 M48 G51 1687 1686 1697 1683 3756 3767 SB119 SB117 SB116 SB132 SB118 SB115 SB201 SB113 SB113 SB112 SB13A 1695B 1695A SB83-6P 12 12 12 10 10 10 10 10 9.5 (14) (12.5) (12.5) 10 l l l l l l l l Indian Head Mine North Dakota Geological Survey 24K: MdcB - c Cartographic Compilation: Elroy L. Kadrmas 102 o 00 ' 00 " 47 o 15 ' 00 " 101 o 52 ' 30 " 101 o 52 ' 30 " 102 o 00 ' 00 " 47 o 07 ' 30 " 47 o 07 ' 30 " 47 o 15 ' 00 " Edward C. Murphy, State Geologist Lynn D. Helms, Director Dept. of Mineral Resources UNIT DESCRIPTIONS Lignite Reserves Medicine Butte Quadrangle, North Dakota (ZA P) (BEULAH) (GO LD EN VA LLEY ) (WI LLO W CR EEK EA ST) (MEDI CINE BUTTE SE) (SCH AF FN ER C REEK N E) (MEDI CINE BUTTE SW) (MEDI CINE BUTTE NE) Edward C. Murphy 2007 MN 12 o 1980 Magnetic North Declination at Center of Sheet Geology Undifferentiated Economic Coal Deposits Geologic Symbols Extent of Local Lignite Reserves Data Points ! Drill Hole Numbers 1697 ! Thickness (in feet) of Mineable Lignite 10 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. 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. Includes Coal Exploration NDGS/USGS drill holes, Sub-surface Mineral drill holes, Oil & Gas drill holes, and NDSWC drill holes. Other Features Unpaved Road Thickness in ( ) signifies two beds of coal. l T. 1 43 N . T. 1 42 N . Areas of Mined Coal Contour Interval 20 Feet USGS 7.5 Minute Topographic Map 1927 North American Datum NGVD 1929 Road Layer Rectified to 2003 NAIP Digital Orthophoto Stand ard Parallels 47 o 07 ' 30 " and 47 o 15 ' 00 " Lambert Conformal Conic Projection 0 0.5 1 Miles 1:24,000 Scale This project was supported by, in part by the U.S. Geological Survey, Department of Interior, under assistance awards 02ERTAG0016 and 05ERAG0053. R. 88 W. R. 89 W. T. 1 44 N . T. 1 43 N . Medicine Butte Quadrangle, North Dakota !

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Page 1: Lignite Reserves - North Dakotacoal 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

R. 100 W.

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!

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!M146 BU028

IH8326

IH8327IH8323

IH8328

IH8322IH8324

6C

6P

5C5P

31

304C 4P

8C 8P

1P1C

7P7C

2C

5P3C3P

P1

M48

G51

16871686

16971683

3756

3767

SB119

SB117

SB116

SB132

SB118

SB115 SB201

SB113

SB113

SB112

SB13A

1695B1695A

SB83-6P

12

12

12

10

10

1010

10

9.5

(14)

(12.5)

(12.5)

10

l

l

l

l l

l

l

l

Indian

Head

Mine

North Dakota Geological Survey24K: MdcB - c

Cartographic Comp ilation: Elro y L. Kadrmas

102o 00' 00"

47o 15' 00"101o 52' 30"

101o 52' 30"102o 00' 00"47o 07' 30" 47o 07' 30"

47o 15' 00"

Edward C. Murphy, State GeologistLynn D. Helms, Director Dept. of Mineral Resources

UNIT DESCRIPTIONS

Lignite ReservesMedicine Butte Quadrangle, North Dakota

(ZAP) (BEULAH)

(GOLDEN VALLEY)

(WILLOW CREEK EAST) (MEDICINE BUTTE SE)

(SCHA

FFNE

R CRE

EK N

E)

(MEDI CINE BUTTE SW)

(MED

ICIN

E BU

TTE N

E)

Edward C. Murphy2007

MN12o

1980 Magnetic North Declinat ion at Center of Sheet

Geology Undifferentiated

Economic Coal Deposits

Geologic Symbols

Extent of Local Lignite Reserves

Data Points

! Drill Hole Numbers1697

! Thickness (in feet) of Mineable Lignite10

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.

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.

Includes Coal Exploration NDGS/USGS drill holes, Sub-surface Mineral drill holes, Oil & Gas drill holes, and NDSWC drill holes .

Other Features

Unpaved Road

Thickness in ( ) signifies two beds of coal.

l

T. 1 43 N.

T. 1 42 N.

Areas of Mined Coal

Contour Interval 20 FeetUSGS 7.5 Minu te Topographic Map1927 North American Datum NGVD 1929

Road Layer Rectified to 200 3 NAIP Digital Orthopho to

Stand ard Parallels 47o 07' 30" and 47o 15' 00"Lambert Co nformal Conic Project ion

0 0.5 1Miles

1:24,000Scale

This project was supported by, in part by the U.S. Geological Survey,Department of Interior, under assistance awards 02ERTAG0016and 05ERAG0053.

R. 88 W.R. 89 W.

T. 1 44 N.

T. 1 43 N.

Medicine Butte Quadrangle, North Dakota

!

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