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-30- ORE CONTROLS AND OPEN PIT GEOLOGICAL PROCEDURES AT STEEP ROCK IRON MINES LIMITED DAVID C. MULDER Steep Rock Iron Mines Limited, Atikokan, Ontario ABSTRACT The ore controls of the Middle Arm orebodies of the Steep Rock Iron Range have been well established as the result of an almost continuous programme of mapping, sampling, and development drilling from 1945 to the present time, during which period Steep Rock Iron Mines Limited has shipped a total of thirty—five million tons of ore. The remarkably uniform stratigraphic sequence of the Steep— rock Group, which lies within a sedimentary—volcanic sequence of Archean age, has proven to be the most useful ore control, particularly with regard to projections on the smaller scale. A major fault system strikes from 020 to 065 with steep dips mainly to the east; a minor fault system strikes a fairly consistent 115 with steep dips to the north and south. Both fault systems are of post—orezone age with the majority of the vertical and horizontal offsets ranging from 15 feet to 60 feet. Cross—cutting and conformable altered basic dykes of post— orezone age often occupy planes of weakness, such as faults and strati— graphic contacts, and are erratically distributed causing considerable dilution of high grade ore to crude ore in the mining process. Sill— fication of the Goethite Member is quite erratic on the larger scale, and produces a type of crude ore which is difficult to beneficiate. The above ore controls play a very important role in pit planning, both on the short and long term. Due to the complexity of the total geological picture, it is continually necessary to gather new data and reinterpret previous vertical projections. A major underground development drilling programme, which commenced in 1967 and is presently nearing completion, is establishing the position of the major geological contacts at the proposed ultimate pit elevation for pit planning purposes. Highly successful new techniques in drilling and identifying rubbly goethitic formations were developed during the early stages of this progranune. The drilling results provide an invaluable control when projecting the geology on the vertical plane below the present pit bottom. Experience has provided invaluable guidelines in the form of approximate limits of projection with relation to allowable limits of error. Besides estimating reserves over the long term, the Geology Department plays a vital role in controlling the recovery of ore during the daily mining operations.
-31-. KEWEENANWAN COPPER DEPOSITS IN TIlE ARCHEAN OF NORTHWESTERN ONTARIO by R. OJA Thunder Bay, Ontario AB ST RA CT A number of copper showings related to breccia zones in highly metamorphosed sedimentary rocks and in granitic gneisses have been discovered north of Lake Superior but south of the volcanic—sedimentary Leitth—Geraldton—Little Long Lac gold belt in Northwestern Ontario. Geological mapping and diamond drilling has been carried out at some of the more promising prospects. The mineralization, which occurs in breccia zones up to 150 feet wide, consists primarily of pyrite and chalcopyrite with small quantities of bornite. The breccia zones are seen to accompany both large and small fault zones. The largest fault zones are thought to cut both the late Keweenawan—Logan diabase sill as well as the Keweenawan sedimentary and volcanic formations of the Sibley and Osler series.
Page 1 and 2: -ç — — I: .t. F Geology Superi
Page 3 and 4: TABLE OF CONTENTS INSTITUTE DIRECTO
Page 5 and 6: -2- "P R 0 G R A M" Tate day, Ma9 5
Page 7 and 8: -4- SESSTOM 2 1.00 Business Meeting
Page 9 and 10: -6- F'viday, May Slit, 1970 Page No
Page 11 and 12: -8- SYNTHESIS OF EARLY PRECAMBRIAN
Page 13 and 14: -10- THE SOUTHERN ASSOCIATED PART O
Page 15 and 16: -12- THE STRUCTURE OF THE NORTHERN
Page 17 and 18: -14- MT. ST. JOSEPH - AN ARC}IAEAN
Page 19 and 20: -16- A MODEL FOR TECTONIC VARIATION
Page 21 and 22: -18- EARLY PRECAMBRIAN GEOLOGY OF T
Page 23 and 24: DEFORMATION OF THE SEINE CONGLOMERA
Page 25 and 26: -22- MINERAL POTENTIAL IN CREENSTON
Page 27 and 28: -25-- ROOT SEVERANCE AND TECTONIC T
Page 29 and 30: -27- STRUCTURE OF ThE DULUTH GABBRO
Page 31: -29- 1. Department of Geology and G
Page 35 and 36: —33- The youngest rocks in the ar
Page 37 and 38: -35- STRUCTURAL AN!) METAMORPHIC HI
Page 39 and 40: -37.- ARCHAEAN VOLCANIC STRATIGRAPH
Page 41 and 42: ______ __________ _____ IDEALIZED S
Page 43 and 44: —41- (3) The upper liimit of 30 p
Page 45 and 46: -43- Fjgire 2 The revised classific
Page 47 and 48: —45— EVIDENCE FOR A TROPICAL CL
Page 49 and 50: —47-- WIDESPREAD OCCURRENCE OF AL
Page 51 and 52: —49— PROTEROZOIC ROCKS IN THE T
Page 53 and 54: —51— Guide to the Proterozoic R
Page 55 and 56: WEST EAST f * . . .. . . S S S S 5S
Page 57 and 58: ________ — ;—=- — —-- —
Page 59 and 60: —53— The uppermost submember of
Page 61 and 62: —55— Morey notes that sediment
Page 63 and 64: —57— (c) layered mafic bodies,
Page 65 and 66: —59— DESCRIPTION OF STOPS Milea
Page 67 and 68: —6 P- Note downwarping of beds on
Page 69 and 70: —63— Note the lenticular chert
Page 71 and 72: —65— 0.0 From the intersection
Page 73 and 74: —67— STOP 16 In the roadcut to
Page 75 and 76: —69— ThE BEARDMORE-GERALDTON BE
Page 77 and 78: —72— the Quetico belt by Stockw
Page 79 and 80: —72 B— ABITIBI BELT —ø.jsour
Page 81 and 82: —74— Most of the metavolcanic
Page 83 and 84:
—76— SELECTED REFERENCES Anonym
Page 85 and 86:
—78— Stockwell, C. II., 1964; F
Page 87 and 88:
—80— ae DESCRIPTION OF STOPS 0.
Page 89 and 90:
—82— STOP 8 (Paint Lake Fault).
Page 91 and 92:
-84— Outcrops near the road are o
Page 93 and 94:
—87— Guide to the Port Coldwell
Page 95 and 96:
AGE RELATIONSHIPS The volcanosedime
Page 97 and 98:
.• ____________________ . — .._
Page 99 and 100:
-I- + -4.- -I- - - - - — - 4- ; E
Page 101 and 102:
—93— (3) 'flow—layering' exhi
Page 103 and 104:
GOSSAN ZONE IN SULPHIDE BEARING GAB
Page 105 and 106:
—95— (3) feldspars variably fol
Page 107 and 108:
—97— Fig. 6c Fig. 6b ;' TRAIL T
Page 109 and 110:
Pig. 7 West contact of CROSS SECTIO
Page 111:
PRINCE AR THUR HOTEL ® 0 ® SHOREL
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Program, Abstracts, and Guidebooks - University of Minnesota Duluth

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