1,975-foot level - pierre ratcliffepratclif.com/geology/iron-ore-mine-plans/mf-2353-2.pdf · mpbn...
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U.S. DEPARTMENT OF THE INTERIORU.S. GEOLOGICAL SURVEY
MISCELLANEOUS FIELD STUDIES MAP MF–2353Version 1.0
SHEET 2 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
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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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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
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1,975-FOOT LEVEL
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2,125-FOOT LEVEL
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2,275-FOOT LEVEL
5050
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SCALE 1:2,400200 2000 400 FEET100
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