north dakota geological survey edward c. murphy, state … · 2008-12-02 · ( s p r i n g c r e e...

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5134

MA78-90

MA78-86 MA78-88

MA78-87

MA78-88MA78-95

MA78-93

MA78-98

MA78-99MA78-96

MA78-94

MA78-97

MA78-85

MA78-81

MA78-82

MA78-83

MA78-84

MA78-101

MA78-111MA78-112

MA78-110MA78-108MA78-109

MA78-104MA78-103

MA78-105MA78-107

MA78-106

MA78-102

12

26

11

10

10

13

21

14

28

17

17.5

14.5

103o 45' 00"

46o 30' 00"(SPRING CREEK)

103o 52' 30"

46o 30' 00"

(WI LLIAMS LAKE)

(MARMARTH) (IVES)

(PRET

TY B

UTTE

)

103o 45' 00"46o 22' 30"

103o 52' 30"46o 22' 30"

(MARMARTH SE)

(BOY

CE CR

EEK

EAST

)

Cartographic Compilation : E. L. Kadrmas & S.S. Kranich

North Dakota Geological Survey24K: BycC W - c

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

Geologic Symbols

This project supported, in part by the U.S Geological Survey, Departmentof Interior, under assistance awards 02ERAG0016 and 05ERAG0053.

UNIT DESCRIPTIONS

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 Depositsl

Geology Undifferentiated

T. 1 35 N.T. 1 34 N.

Lignite ReservesBoyce Creek West Quadrangle, North Dakota

R. 105 W. R. 104 W.

Other Features

Unpaved Road

MN

1980 Magnetic North Declinat ion at Center of Sheet

12o 30'

0 0.5 1Miles

Scale 1:24,000

Standard Parallels 46o 22' 30" and 46o 30' 00"

USGS 7.5 Minute T opographic Map Con tour Interval 20 Feet

Lambert Con fo rmal Co nic Projection1927 North American Datum NGVD 1929

Road Layer Rectified to 2003 NAIP Digi tal Orthop hoto

Boyce Creek West Quadrangle, North Dakota

Extent of Local Lignite Reserves

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.

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

!( Data Points

Drill Hole Numbers!MA78-109

Thickness (in feet) of Mineable Lignite!10

Edward C. Murphy2008