RESEARCH· ·1970·

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GE·OLOGICAL SURVEY RE·SEARCH 1970 IRON DEPOSITS OF THE ESTES CREEK ARE'A, LAWRENCE COUNTY, SOUTH DAKOTA By RICHARD W. BAYLEY, Menlo Park, Calif. Abstmot.-'l'he lDstes Creek iron deposits underlie a h"illtop nrea in excess of 2 mHlion square feet. Tightly folded Precaml>rian sedimentury iron-formntion .(taconite), about 29 percent iron, makes up the deposit. r ... abora:tory tests by the U.S. Bureau of Mines show thnt the iron-formation is .amenable to concentration. It is estimnted thnt this deposit plus smaller deposits nenrl>y could sustnin n nominal mining venture. 0 This report presents the results of a recent -( 1967) field examination of some iron deposits near Estes Creek in Lawrence County, S. Dak. The Estes· Creek area is one of many in the Nemo district 'Of the northeastern Black I-Iil1s which contain iron deposits (I-Iarrer, 1966). It was selected for special examination ·because it seemed to .contain the largest single iron deposit in the district. Figure. 1 shows the location of the district and the Estes Creek area; figures 2 and 3 show the geology of the area and a magnetic survey of the iron-bearing portions. Siliceous hematite-magnetite iron-formation of Precambrian age makes up the iron deposits. 'rhe iron-formation is mainly in the SE1,4 sec. 33 (figs. 2 and 4), and mainly on a group of mineral claims cal1ed "B & 0". The principal deposit location is a relatively flat hilltop 400-500 feet above Estes Creek; it is easily accessible, and the topography (fig. 4) seems naturally suited· to open-pit 1nine development. FIELD METH001S ~{ost of the area of figure 2 was 1napped by paceand -compass methods on topographic base rna ps. The small area which includes the iron deposits (fig. 3) was given special attention. The directions of survey lines were controlled by sundial compass, and· distances n.1ong the lines were measured by steel tape and corrected approximately for slope. The origin of the detailed survey, point A on figures 2 and 3, represents a small hill showing one closed contour, the center point Tertiary intrusive rocks 0 6 MILES EXPLANATION Edge of Paleozoic rocks If r .r rl Precambrian rocks FIGURE 1.-Generalized geologic map of the northern Black Hills, showing location of the. Estes Creek iron .area. of which was determined as closely as possible by inspection on the .ground. This point of origin could be mislocated sli·ghtly ( 10-25 feet) in any direction, and each other point of the survey net could be similarly shifted. Beyond the survey net, points are less well located, and errors of location of 50 feet or more may be expected. However, it is not expected tha,t errors in location of the order mentioned in. any way affect the final geologic· picture. U.S. GEOL. SURVEY PROF. PAPER 700-B; PAGES B93-B101 B93
B94 ECONOMIC GEOLOGY 103° 35' w 1/1 p: 0 2Qqo FEET Base from U.S. Geological Survey Nemo 1:24.000. 1955 Geology by R. W. Bayley. 1967 :, FIGURE 2.
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. ., GEOLOGICAL SURVEY RESEARCH·
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CONTENTS GEOLOGIC STUDIES Petrology
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GEOLOGICAL SURVEY RESEARCH 1970 Geo
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B2 PETROLOGY AND PETROGRAPHY for bi
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B4 PETROLOGY AND PETROGRAPHY has be
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B6 PETROLOGY AND PETROGRAPHY. 32
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B8 PETROLOGY AND PETROGRAPHY TABLE
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BlO · PETROLOGY AND PETROGRAPHY EX
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GE,OLOGICAL SURVEY RESEA·RCH 1970
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B16 PETROLOGY AND PETROGRAPHY Sprin
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B20 PETROLOGY AND PETROGRAPHY Sigva
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B22 PETROLOGY AND PETROGRAPHY EXPLA
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B24 PE~ROLOGY AND PETROGRAPHY schis
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B28 PETROLOGY AND PETROGRAPHY sg•
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B30 PETROLOGY AND PETROGRAPHY Detri
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B32 PETROLOGY AND PETROGRAPHY place
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B34 PETROLOGY AND PETROGRAPHY 66 '
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B36 PETROLOGY AND PETROGRAPHY Post-
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B40 PETROLOGY AND PETROGRAPHY did n
Page 47 and 48: B42 PETROLOGY AND PETROGRAPHY Creta
Page 49 and 50: td :t 106'20' r--- 10' 106'00' 38'3
Page 51 and 52: B46 STRUCTURAL GEOLOGY FIGURE 4.-Vi
Page 53 and 54: B48 STRUCTURAL GEOLOGY FIGURE 6.-An
Page 55 and 56: B50 STRUCTURAL GEOLOGY clined slide
Page 57 and 58: GE,OLOGICAL SURVEY RESEARCH 1970 CA
Page 59 and 60: B54 GEOPHYSICS (1950), Domzalski (1
Page 61 and 62: B56 GEOPHYSICS STRATIGRAPHY AND LIT
Page 63 and 64: B58 GEOPHYSICS STRATIGRAPHY AND LIT
Page 65 and 66: B60 GEOPHYSICS value. A normal free
Page 67 and 68: B62 GEOPHYSICS Hammer, Sigmund, 193
Page 69 and 70: B64 110°45' GEOPHYSICS L I I \ "'\
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Page 73 and 74: B68 GEOPHYSICS A' San 0 p A c I F I
Page 75 and 76: B70 GEOPHYSICS lies occur over rela
Page 77 and 78: B72 GEOPHYSICS 36° 00' A' 40___./
Page 79 and 80: B74 GEOPHYSICS igneous massif is co
Page 81 and 82: B76 GEOPHYSICS A 50 Bouguer gravity
Page 83 and 84: GE·OLOGICAL SURVEY RESEARCH 1970 R
Page 85 and 86: B80 GEOPHYSICS FIGURE 1.-Bouguell'
Page 87 and 88: B82 GEOPHYSICS J I 37·~~------~~--
Page 89 and 90: B84 GEOPHYSICS B 600 B' 500 400 (/)
Page 91 and 92: GE,OLOGICAL SURVEY RESEA·RCH 1970
Page 93 and 94: EXPLANATION Pikes Peak • batholit
Page 95 and 96: DISTRIBUTION OF URANIUM IN URANIUM-
Page 97: B92 GEOCHRONOLOGY Fleischer, R. L.,
Page 101 and 102: 'B96 ECONOMIC ·GEOLOGY 0 500 FEET
Page 103 and 104: B98 ECONOMIC GEOLOGY TABLE !.-Summa
Page 105 and 106: BlOO ECONOMIC GEOLOGY surface seems
Page 107 and 108: GE 1 0LOGICAL SURVEY RESEA·RCH 197
Page 109 and 110: B104 EJrucJh of the four samples wa
Page 111 and 112: B106 ECONOMIC GEOLOGY R. 56 E. R. 5
Page 113 and 114: B108 ECONOMIC GEOLOGY outcrop under
Page 115 and 116: BllO Brady, of the Museum of Northe
Page 117 and 118: Bll2 PALEONTOLOGY FIGURE 1.-ProtobZ
Page 119 and 120: B114 PALEONTOLOGY c .,;# I I ' ' lO
Page 121 and 122: B116 PALEONTOLOGY ments, the larges
Page 123 and 124: GErOLOGICAL SURVEY RESEA·RCH 1970
Page 125 and 126: B120 L xMH 'xE soo~~B_R~I __ T_I __
Page 127 and 128: B122 PALEONTOLOGY Tetrataxis sp. Te
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Page 131 and 132: Bl26 PALEONTOLOGY TABLE 2.-Ranges o
Page 133 and 134: B128 PALEONTOLOGY l
Page 135 and 136: BI30 PALEONTOLOGY Ocmt/rrence.-P. m
Page 137 and 138: Bl32 PALEONTOLOGY proximately 5.7 m
Page 139 and 140: Bl34 PALEONTOLOGY a b c d e f g - D
Page 141 and 142: Bl36 PALEONTOLOGY --- 1963. The ori
Page 143 and 144: B138 PALEONTOLOGY core are m1ssmg,
Page 145 and 146: B140 PALEONTOLOGY death assemblage:
Page 147 and 148: Bl42 STRATIGRAPHY EXPLANATION l:.\.
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B144 STRATIGRAPHY ver. We do not in
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B146 STRATIGRAPHY age. A stratigrap
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B148 5 10 15 20 X X Plntygonus Pla.
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GE~OLOGICAL SURVEY RESEARCH 1970 CL
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B152 STRATIGRAPHY at a depth of 58
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••••• 0 .... ••••
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B156 STRATIGRAPHY REFERENCES Brown,
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B158 STRATIGRAPHY In what follows,
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Bi60 STRATIGRAPHY TABLE !.-Stratigr
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B162 SEDIMENTATION with increasing
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llj ...... ~ TABLE 2.-Specific grav
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B166 TABLE 3.-Settling time for a 1
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Bl68 GEOMORPHOLOGY 74° 44° YERMON
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B170 GEOMORPHOLOGY have also been r
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B172 GEOMORPHOLOGY end of Long Isla
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GEOLOGICAL SURVEY RESEARCH 1970 DET
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~ooo ______________ B176 ANALYTICAL
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B178 terranes where the search for
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B180 Reproducibility Replicate anal
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B182 ANALYTICAL METHODS in the aque
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GEOLOGICAL SURVEY RESEARCH 1970 CHE
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B186 ANALYTICAL METHODS 3.31 percen
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Bl88 ANALYTICAL METHODS 3" 2%" Oute
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GEOLOGICAL SURVEY RESEA~RCH 1970 TR
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B192 GROUND-WATER RECHARGE I T I 14
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B194 GROUND-WATER RECHARGE Therefor
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GEOLOGICAL SURVEY RESEARCH 1970 PRE
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B198 GROUND-WATER RECHARGE the basi
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B200 GROUND-WATER RECHARGE t \ \)
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B202 GROUND-WATER RECHARGE Water is
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B204 GROUND-WATER CONTAMINATION rv
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B206 GROUND-WATER CONTAMINATION TAB
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B208. GROUND-WATER CONTAMINATION fa
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GEOLOGICAL SURVEY RESEARCH 1970 MEA
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B212 SURFACE WATER plotted, and the
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GEOLOGICAL SURVEY RESEA·RCH 1970 T
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B216 SURFACE WATER however, if the
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B218 SURFACE WATER TABLE 4.-Variati
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B220 RELATION· BETWEEN GROUND eral
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B222 -0.010 f -0.005 (i) RELATION B
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GEOLOGICAL SURVEY RESEARCH 1970 THE
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'B226 RELATION BETWEEN GROUND WATER
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B228 RELATION, BETWEEN GROUND WATER
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B230 RELATION BETWEEN GROUND WATER
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GEOLOGICAL SURVEY RESEARCH 1970 HYD
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B234 EROSION AND SEDIMENTATION side
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B236 EROSION AND SEDIMENTATION s·o
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B238 EROSION AND SEDIMENTATION Cont
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B240 EROSION AND SEDIMENTATION 2 3
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GEOLOGICAL SURVEY RESEARCH 1970 SPE
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B244 GEOCHEMISTRY OF WATER REFERENC
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B246 HYDROLOGIC TECHNIQUES The upla
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B248 HYDROLOGIC TECHNIQUES type in
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GEOLOGICAL SURVEY RESEARCH 1970 ,,.
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B252 formula may also be useful in
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GEO'LOGICAL SURVEY RESEARCH 1970 CO
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B256 randomly fluctuating component
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B258 HYDROLOGIC TECHNIQUES 1.0 ~ Qj
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~ B260 HYDROLOGIC TECHNIQUES 1-3, f
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I B262 HYDROLOGIC TECHNIQUES REFERE
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,' B264 Page Gravitational sliding,
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., / )
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