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U.S. DEPARTMENT OF THE INTERIORU.S. GEOLOGICAL SURVEY
MISCELLANEOUS FIELD STUDIES MAP MF–2353Version 1.0
SHEET 5 OF 5
Pamphlet accompanies map
GEOLOGIC MAPS AND CROSS SECTIONS OF MINE LEVELS AT THE PEA RIDGE IRON MINE, WASHINGTON COUNTY, MISSOURIBy
C.M. Seeger,1 L.M. Nuelle,2 W.C. Day,3 G.B. Sidder,4 M.A. Marikos,5 and D.C. Smith1
20011Missouri Department of Natural Resources, Division of Geology and Land Survey, P.O. Box 250, Rolla, MO 654012Doe Run Mining Company, P.O. Box 500, Viburnum, MO 655663U.S. Geological Survey, Denver, CO4Littleton, CO5University of Arizona, Department of Geosciences, Tucson, AZ 85705
Manuscript approved for publication April 10, 2001
Any use of trade names in this publication is fordescriptive purposes only and does not imply endorsement by the U.S. Geological Survey
This map was produced on request, directly fromdigital files, on an electronic plotter
For sale by U.S. Geological Survey Information ServicesBox 25286, Federal Center, Denver, CO 802251-888-ASK-USGS
A PDF for this map is available athttp://geology.cr.usgs.gov/pub/mf-maps/mf-2353
�l
bp
sr
h
m
aqr
vr
hu
mbu
mpbn mpbo hpb
mhbn mhbo hhb
mabn
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mabo hab
da dm
Upper Cambrian
Middle Proterozoic
Unconformity
CORRELATION OF MAP UNITS
LIST OF MAP UNITS
Lamotte Sandstone (Upper Cambrian)
MIDDLE PROTEROZOIC UNITS
Aplite dikes
Mafic dikes
REE mineral-bearing breccia pipes
Silicified rock
Specular hematite
Hematite, undivided
Magnetite
Pseudobreccia
Magnetite-cemented pseudobreccia non-ore
Magnetite-cemented pseudobreccia ore
Hematite-cemented pseudobreccia
Iron oxide-cemented heterolithic breccia
Magnetite-cemented heterolithic breccia non-ore
Magnetite-cemented heterolithic breccia ore
Hematite-cemented heterolithic breccia
Iron oxide-cemented amphibole breccia
Magnetite-cemented amphibole breccia non-ore
Magnetite-cemented amphibole breccia ore
Hematite-cemented amphibole breccia
Magnetite-cemented breccia, undivided
Amphibole-quartz rock
Volcanic rocks
Banded rock
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sr
h
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mpbn
mpbo
hpb
mhbn
mhbo
hhb
mabn
mabo
hab
mbu
aqr
vr
br
da
dm
Contact—Dashed where projected or inferred; jagged where extremely gradational
Fault—Showing approximate dip where known. Dashed where projected or inferred. R, reverse fault
Mine workings—Open-ended workings indicate stopes or abandoned areas
Development drill holes
Flat
Inclined up
Inclined down
Vertical—Cross sections only
Shaft location
Altered rock
Silicification and potassium feldspar alteration
Amphibole alteration
70R
�l
hpb mpbn
vr
vr
mpbn
m
m
m
mpbn
mpbn mpbo
vr
vr
mpbn
aqr
mpbnmpbo
mhbn
vr
m
mpbo
m
m
mpbo
aqr
vr
vr
vr
mhbomhbn
mhbn
mhbo
mhbo
aqr
m
mhbn mhbo
vr
sr
N147300E94600
N147100E94800
N146900E95000 E95200
N146700
1100
1200
1300
1400
1500
1600
1700
1800
1900
2000
2100
2200
2300
2400
2500
2600
2700
dm
dm
dm
dm
dm
dm
dm
dm
dm
dm
dm
sr
aqr
m
mabo
dm
aqr
vr
sr
A A'
1,675-ft level
1,825-ft level
1,975-ft level
2,125-ft level
2,275-ft level
2,370-ft sublevel
2,440-ft sublevel
2,475-ft level
2,505-ft sublevel
2,675-ft sublevel
1,375-ft levelA A'
A A'
A
A
A
A
A
A
A
A
A
A'
A'
A'
A'
A'
A'
A'
A'
A'
DEPTH(feet)
mpbn
�l
vrvr
vr
sr
sr
h
m
aqr
m
aqr
vr
sr
mabo
mpbo
vr
vr
vr
h
h
sr
mhbompbnaqr
vr
aqrmhbo
vr
m
aqr
N147900E95000
N147700E95200
N147500E95400
N147300E95600
N147100E95800
1100
1200
1300
1400
1500
1600
1700
1800
1900
2000
2100
2200
2300
2400
2500
2600
2700
2800
dm
dm
dm
dm
dm
dm
dmdm
dm
dm
dm
mhbn
mhbo
mabo
sr
mabo
mabn
mpbn
vr
B B'
B
B
B
B
B
B
B
B
B
B
B
B'
B'
B'
B'
B'
B'
B'
B'
B'
B'
B'
1,675-ft level
1,825-ft level
1,975-ft level
2,125-ft level
2,275-ft level
2,370-ft sublevel
2,440-ft sublevel
2,475-ft level
2,505-ft sublevel
2,675-ft sublevel
1,375-ft level
DEPTH(feet)
�l
h
h
h
vr
vr
vr
vr
m
m
m
aqr
aqr
aqr
srsr
sr
mmpbo
mpbn
vr
vr
vr
aqr
mpbn
mpbn
mhbo
mhbo
m
mhbn
sr
sr
vr
hpb
bph
h
hpb
vr
hpb mpbn
N148300E95600
N147900E95800
N147500E96000
N147100E96200
1400
1500
1600
1700
1800
1900
2000
2100
2200
2300
2400
2500
2600
2700
dm
dm
dm
da
dm
dm
dm
dm
dm
dm
h
m
dmbp
mpbo
sr
vr
dm
No data
DEPTH(feet)
C C'
C
C
C
C
C
C
C
C
C
C
C'
C'
C'
C'
C'
C'
C'
C'
C'
C'
1,675-ft level
1,825-ft level
1,975-ft level
2,125-ft level
2,275-ft level
2,370-ft sublevel
2,440-ft sublevel
2,475-ft level
2,505-ft sublevel
2,675-ft sublevel
�l
vr
vr
sr
aqr
aqr
vr
h
h
h
m
m
mpbn
mpbo
mabn
hpb
sr
sr
hpb
m
mhbo
mpbn
vr
sr
mhbo
sr
hhb
h
bp
br
hpb
hpb
h
h
hpb
mhbo
mpbo
h
mpbo
mhbn
m
N148100E95800
N147700E96000
N147300E96200
1300
1400
1500
1600
1700
1800
1900
2000
2100
2200
2300
2400
2500
2600
2700
2800
2900
3000
3100
3200
3300
3400
dm
dm
da
dm
dm
dm
vr
sr
mpbn
dm
dm mhbn
mhbn
mhbo
mhbo
dm
vr
srh
hpb
bp
vr
sr
vr
mhbo
mabo
aqr
mpbo
dm
sr
mhbn
mhbn
da
dm
mpbo
dm
DEPTH(feet)
1,675-ft level
1,825-ft level
1,975-ft level
2,125-ft level
2,275-ft level
2,370-ft sublevel
2,440-ft sublevel
2,475-ft level
2,675-ft sublevel
2,505-ft sublevel
D D'
D
D
D
D
D
D
D
D
D
D
D'
D'
D'
D'
D'
D'
D'
D'
D'
D'
�l
vr
vr
vr
m
mabn
vr
vr
vr
mhbo
mabn
mabo
vr
vr
mpbn
mpbn
mhbn
mhbomhbo
mbu
m
hpb
N148100E96800
N147900E96800
N147700E96800
N147500E96800
1300
1400
1500
1600
1700
1800
1900
2000
2100
2200
2300
2400
2500
sr
dm
dm
dm
dm
dm
da
vr
hu
sr
aqr
mabn
mabn
mabnm
mhbo
mhbo
mabo
2600
2700
hu m mbu
vr
No data
vr
No data
No data
vr
mabo
sr
DEPTH(feet)
1,675-ft level
1,825-ft level
1,975-ft level
2,125-ft level
2,275-ft level
2,370-ft sublevel
2,440-ft sublevel
2,475-ft level
2,505-ft sublevel
2,675-ft sublevel
E E'
E
E
E
E
E
E
E
E
E
E
E'
E'
E'
E'
E'
E'
E'
E'
E'
E'
SCALE 1:2,400200 2000 400 FEET100