lignite reserves - north dakotacoal thickness of ten feet-typically occuring in less than two beds,...
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R. 100 W.
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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
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l l
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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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