Blackwell Township North Ontario ~- the Map Area Comprises the Townships of Blackwell and Laurie, and South of Highway 11

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480 41©30" 48 0 4T30" Ministry of MARGINAL NOTES Northern Development and Mines LOCATION AND ACCESS metasediments in the southern part of Blackwell Township north Ontario ~- The map area comprises the Townships of Blackwell and Laurie, and south of Highway 11. The rocks are characteristically red and Mines and Minerals Division and the extreme western end of the Dawson Road lots. It is pink, horn blend e-bearing calc alkalic and shoshonitic rocks, and Ontario Geological Survey bounded by Latitudes 48C30©00"N, and 48040©15*N and is centred appear to be interlayered with Ihe sedimentary rocks. They are aDout 38 km northwest of Thunder Bay. similar to the rocks occurring in the central volcanic facies in south-central Laurie Township which suggests that late Keewatin- MAP P.3082 Land access to the area is provided by Highway 17 imme type volcanism continued into the period of Timiskaming deposi diately east of Blackwell Township; Highway 11, which passes Geological Series-Preliminary Map tion. through the townships in an east-west direction; and a forest access road which leads southward from Shabaqua Corners Late mafic intrusive rocks comprise fresh aphyric and {immediately east of the map area) on Highway 11-17, and tra feldspar-phyric northeasterly and easterly trending dikes, massive verses the southeastern part of the map area. Lumber roads of the gabbroic rocks, diorite, and hornblende and pyroxene lam PRECAMBRIAN GEOLOGY Great Lakes Paper "Company Limited, which begin at Highway 590 prophyre. Intrusive relationships with the Timiskaming-type rocks southeast of the map area, provide access to the area east of show that some of these lamprophyres represent the latest ig Gold Creek in southwestern Laurie Township. The Matawin River neous activity in the map area. The diabase and lamprophyre BLACKWELL TOWNSHIP provides access to the south-central part of the map area. The dikes form bodies varying from 3 to 30 m in width. northwestern part of Laurie Township, and the southwestern and Pleistocene deposits comprise glaciolacustrine clays which DISTRICT OF THUNDER BAY north-central parts of Blackwell Township are best reached by are developed in northeastern and southeastern Blackwell Town helicopter. ship and southeastern Laurie Township; ground moraine that con sists of sand and gravel exposed in the central part and the Scale 1:15840 northeastern corner of Blackwell Township; and Recent organic Mile K O 1A V, Mile MINERAL EXPLORATION material comprising peat and muck along the upper reaches of the Mvtru 100 O 0.4 0.6 0.8 l Kilometre Matawin River in southern Laurie Township, along stream courses HHM ^ b-^r- Unless otherwise stated, the following account has been summa throughout Laurie Township, and in southern Blackwell Township rized from the files of the Resident Geologist, Ontario Ministry of (Mollard and Mollard 1980, 19B1). An esker, consisting of cobbles Northern Development and Mines, Thunder Bay. and the Assess and coarse sand, forms a steep ridge which trends northeastward NTS Reference: 52 A/5.12; 52 B/8.9 ment Files Research Office, Ontario Geological Survey, Toronto in southeastern Laurie Township. ODM-GSC Aeromagnetic Maps: 1102G, 2097G (AFRO). The supracrustal rocks have been metamorphosed to the ODM Geological Compilation Map: 2065 Exploration activity was carried out mainly for iron ore depos greenschist facies of regional metamorphism in the central part of its in the 1890s and 1900s as the southern pan of the map area the map area, but the grade increases both to the north and south lies astride the Matawin Iron Range. Exploration for gold, base- of this area. Towards Ihe north, the rocks pass into the am metal sulphide mineralization, and nickel became important in the phibolite facies of regional metamorphism: the rocks of the Queen©s Printer for Ontario, 1987 second quarter of the present century. Recently, with favorable Quetico metasediments north of Highway 11 are in the garnet Printed in Ontario, Canada gold prices, considerable gold exploration has occurred in the zone, and metasedimentary migmatites are developed farther to south-central part of Laurie Township. Overall, most of the explora Parts of this publication may be quoted if credit is Ihe northeast. Towards the south, in the aureole of Ihe granitic given and the material is properly referenced. tion activity has taken place in southern Blackwell Township and intrusion in southwestern Laurie Township, the mafic metavol m Laurie Township, areas underlain by metavolcanics. canics have been metamorphosed to the amphibolite facies of This map is published with the permission of V.G. contact metamorphism. Milne, Director, Ontario Geological Survey. BASE-METAL SULPHIDE MINERALIZATION Magnetic trends over Ihe map area are parallel to the lithological-slructural trend and are related to magnetic ironstone In 1956, Three Brothers Exploration carried out a drill program units interlayered with the metavolcanics and metasediments, and along the northern shore of the Shebandowan River between with the interlayered intrusive metagabbroic rocks. At the central Mabeila and the confluence of the Oskondaga and Shebandowan part of the southern boundary of the map area, a magnetic Rtvers Five diamond-drill holes were put down, totaling 3595 feet anomaly straddling the Matawin River may represent a metagab (1096m). At various times between 1967 and 1979, Noranda broic body, but no outcrops are present in the area. Along the Exploration Company Limited carried out a series of ground elec northern boundary of the map area, magnetic anomalies are asso tromagnetic and magnetic surveys in parts of southwestern and ciated with granitic rocks but outcrops are lacking here also. west-central Laurie Township. One of the many conductors found However, similar anomalous areas are associated with granitic was intersected by a diamond-drill hole 216.7 feet (66.1 m) long in rocks to the east in adjacent Goldie Township, where the anoma 1967. lies were found to be associated with very melanocratic facies of In the period March 1972 to March 1973, J.C. Byrne (Caltor syenite and diorite (Carter 1985). It is likely that the same con Syndicate) drilled nine diamond-drill holes for a total length of ditions occur in Blackwell Township. 3371 feet (1027 m) in south-central Laurie Township. STRUCTURAL GEOLOGY GOLD Structurally, the area is characterized by an east-southeasterly In 1937, Hialeah Gold and Metals Limited conducted a program of grain which reflects the trends of folding and foliation within the stripping and trenching in an area about 2.4 Km south of Keewatin-lype and Timiskaming-type rocks. Shabaqua Station in northeastern Laurie Township. This work was prompted by the discovery of free gold in blue quartz veins Folding in the older Keewatin-type metavolcanics and occurring in oxidized schist, rhyolite, and feldspar porphyry. metasediments is tightly isoclinal about east-southeasterly axes in the northeastern part of Laurie Township and the southeastern In 1945, gold was discovered at the Kaspar Occurrence in part of Blackwell Township. This trend veers to an east-west southeastern Blackwell Township and trenches and pits were direction towards the west. The fold axes in this southern part of excavated. In 1945, Sylvanite Gold Mines Limited carried out Blackwell Township are based on bedding attitudes obtained from LOCATION MAP Scale: 1:1 584 000 or 1 inch to 25 miles detailed geological mapping and sampling. The occurrence was interflow sediments interlayered wilh the melavolcanics, and simi also examined by M.W. Bartley at an unknown time. In 1976. lar features observed in southwestern Goldie Township and north Noranda Exploration Company Limited carried out geophysical. western Horne Township (Carter 1985) immediately to Ihe east. In geochemical, and geological surveys in an area which included spite of the tight folding in this central part of the map area, this occurrence. The geochemical survey, which was carried out regional considerations and facing data indicate a south-facing LEGEND* in soils overlying several airborne conductors, indicated several homoclinal sequence. In the southern part of the map area, in copper anomalies and two zinc anomalies. Subsequently, in 1982, southern Laurie Township, facing data indicate a homoclinal se PHANEROZOIC METAVOLCANICS AND METASEDIMENTS (KEEWATIN-TYPE)b Lacana Mining Corporation carried out a geological and geophysi quence facing north. These features indicate a regional syncline CENOZOIC METASEDIMENTS cal survey on a property which also included the Kaspar Occur with an east-trending curvilinear axis, convex to the north, cross QUATERNARY Chemical Metasediments rence. The geophysical work indicated that the property was ing Ihe south-central part of Laurie Township. Because of the graphitic PLEISTOCENE AND RECENT underlain by numerous conductive zones indicative of severe deformation of primary features in the younger Keewatin- 7 Unsubdivided interflow sedimentary rocks. Grab samples were taken from pits type rocks in this area, local young ing-d i fee t i on criteria were not Sand, clay, gravel, and swamp deposits located on the property during the current survey for gold and observed. 7a Silicified graphitic mudstone silver assays. Folding in the Quetico- and Timiskaming-type metasedtments i UNCONFORMITY 7b Magnetite-jasper ironstone In 1958, George Chilian drilled ten diamond-drill holes for a isoclinal about east-southeasterly axes. 7c Chert, black or grey is tightly PRECAMBRIAN total of 564 feet (172 m) and dug four trenches in an area located Foliation is well developed in the Keewatin-type and in northwestern Laurie Township al Sand Lake (local name). This Timiskaming-type rocks. In the Keewatin-type rocks, the foliation LATE ARCHEAN TO PROTEROZOIC Clastic Metasediments occurrence was not relocated during the current survey. trends east-southeasterly, with near vertical dips on the northern MAFIC INTRUSIVE ROCKSb In 1983, Corporate Oil and Gas Limited carried out geological flank of the volcanic edifice. In southern Laurie Township, how 6 Unsubdivided and geochemical surveys on two claim groups: one in southeast ever, the foliation trend of Ihe rocks on the southern flank of the 14a Diabase, aphyric, medium-grained 6a Siltstone ern Blackwell Township, and the other in northeastern Laurie volcanic edifice is arcuate, convex to the north. The author be I4b Gabbro, medium-grained 6b Mudstone associated with Township. Thts geochemical survey detected gold anomalies in lieves that this pattern is related to deformation 14c Diabase, porphyritic, feldspar phenocryst^ 6c Graphitic siltstone the soil horizons sampled in both claim groups. the intrusion of the complex batholith located lo the southwest of Md Gabbro, coarse-grained 6d Laharic breccia with pyrite nodules From January to March 1985, Jalna Resources Limited had the map area, the northern edge of which is exposed in south airborne magnetic and electromagnetic geophysical surveys flown western Laurie Township. Within the Keewatin-type rocks of the BOUNDARY Ue Diorite 61 Wacke over their property in an area which straddled the Duckworth- central facies, a northeasterly trend is dominant in the western Mf Lamprophyre with pink carbonate 6h Argillaceous siltstone Laurie Township boundary and covered part of southwestern Lau part, and east-west foliation trends occur farther east in the 14g Hornblende lamprophyre rie Township. Grab samples were taken during the current survey neighbourhood of the Matawin River. This pattern is also probably 14h Pyroxene lamprophyre METAVOLCANICS related to the intrusion of that batholith. from old pits found on the property for gold and silver assay. 14j Lamprophyre Calc Alkalic and Shoshonitic Rocks During the current survey, two pits were found on the Edwin Faults and lineaments trend northwesterly, northerly, and Kukkee property located at Middle Falls, Matawin River, from northeasterly and the longest ones are up to about 3 km. Intense INTRUSIVE CONTACT 5 Unsubdivided which channel samples from mineralized quartz-carbonate veins shearing is associated with the northwesterly lineament at the 5a Intermediate to felsic flows and pyroclastic rocks in the pits were previously taken for assay. Grab samples were Shebandowan River about 2.5 km east of Mabeila in southern LATE ARCHEAN Blackwell Township, and with the faults in the Matawin River in the 5b Mafic to intermediate flows and pyroclastic rocks also taken from these pits during the current survey for assay for AND METASEDIMENTS (TIMISKAMING- southeastern third ol Laurie Township at Middle Falls, and at a METAVOLCANICS 5c Sericite schist gold and silver. b point about 2.5 km south of these falls. The association of shear TYPE) 5d Tuff METASEDIMENTS ing, and loss of continuity of lithologic units across these linea 5e Hornblende porphyry with mafic clots, red Clastic Metasediments IRON ments suggest thai they are faults 5f Hornblende-quartz-feldspar porphyry in 1952, M.W. Bartley carried out a geological survey of a claim Shear zones, varying from 1 to 10 m in width, occur within the 5g Hornblende-feldspar porphyry, brown Shebandowan 13 Unsubdivided group located in east-central Laurie Township, to evaluate the older Keewatin-type rocks, principally along the 5h Hornblende-f e Ids par porphyry, green River south of Highway 11, and in the younger Keewatin-type 13a Chlorite schist (matrix of conglomerate) economic potential of local ironstone units of the Matawin Iron 5j Feldspar porphyry Range, occurring in Timiskaming-type metasediments at Middle volcanic sequence in southwestern Laurie Township. In the former I3b C h lor i le-s eric ile schist (matrix of conglomerate Falls, Matawin River. Metallurgical tests were carried out which area, the shâr zones irend easlerly. whereas in the latter, they 13c Conglomerate 5k Lapilli-tuff confirmed the unfavorable physical characteristics of the iron trend northeasterly. 13d Wacke, with jasper clasts 5m Hornblende phenocrysts stone. The grade was also found to be inadequate for concentrat Mineral lineation defined by acicular hornblende crystals is 13e Arkose, grey 5n Aphanitic flow ing ore. well developed in the rocks of the younger Keewatin-type 5p Car bon at i zed flow 13f Chloritic mudstone During the period 1956 and 1957, Monpre Mining Company metavolcanics in southwestern Laurie Township. It plunges steeply 5q Amygdaloidal flow to the northwest at 600 to 80". This type of lineation is not as well 13g Arkose, chloritic (green) Limited carried out geological mapping in a search for structural 5r Tuff breccia concentrations of ironstone in the same Timiskaming-type host developed in Ihe eastern part of the central volcanic facies, but a 13h Mudstone sediments, and had Bartley. Greer and Associates supervise a dip- single plunge measurement of 650 to the east-northeast was made 13j Siltstone 5s Glomeroporphyritic flow 5t Quartz latite (quartz phenocrysts) needle survey and a program of diamond drilling on their property in this area. 13k Anker i ti zed sediment lying across the central part of Laurie Township. Nineteen 5u Vesicular flow An unconformity is deduced between the Timiskaming-type 13m Arkose, red and brown diamond-drill holes were drilled in the ironstone, described as a metasedtments and the Keewatin-type meiavolcanic-metasedimen- true taconite (R.A. Halet. Monpre Iron Mines Limited, 1972, AFRO). tary rocks as pebbles and cobbles of volcanic rocks of late 13n Siltstone, graphitic, black Calc Alkalic Felsic Metavolcanics for a total ol 10 592 feet (3228 m). Metallurgical laboratory tests Keewattn-type. granules and pebbles of jasper found associated I Jp Breccia on the material were carried out in 1957 and 1967 by H.V Ross, with ironstone m the Keewatin-type rocks, and granitic cobbles 13q Wacke 4 Unsuboivided and late in 1967 a 250-pound (IHkg) sample was sent by Ihe were observed in the conglomerates. The actual unconformity was 13r Quartzite 4a Quartz-feldspar porphyry company for pilot-plant scale testing During 1968, further tests not. however, observed. The irend of the folding in the IGs Argillaceous siltstone 4b Lapilli-tuff involving stage grinding, magnetic separation and flotation were Timiskammg-type meiasediments is parallel to that in the done on the material. Keewatin-type rocks 12t Arkose, mauve with pink calcite 4c Ignimbrite I3u Arkose, with pink feldspars and hornblende 4d Aphanitic flow 13v Green arkose with pink feldspars 4e Quartz-feldspar porphyry NICKEL ECONOMIC GEOLOGY 4f Felsic flow, gneissic Chemical Metasediments In 1962, Falconbridge Nickel Mines Limited diamond drilled one GOLD 4g Flow with chert fragments 651-foot (198m) hole in southeastern Blackwell Township, pre sumably in a search for nickel mineralization. Chilian Occurrence 12 Unsubdivided Calc Alkalic Mafic to Intermediate Metavolcanics In late 1967 and early 1968, the Canadian Nickel Company This occurrence is located in northwestern Laurie Township in I2a Magnetite-jasper ironstone Limited carried out ground magnetometer surveys with follow-up Keewatm-type melavolcanics at Sand Lake (local name). Sampling !2b Magnetite-arkose-slate ironstone 3 Unsudivided ground electromagnetic surveys in southwestern Blackwell Town ol an unknown kind by George Chilian in 1958, returned a value 12c Magneti le-s i Its tone ironstone 3a Basaltic to andesitic flows and pyroclastic rocks ship and northwestern Laurie Township, southwest of the Sheban of 9,45 ounces of gold per ton (AFRO) Iron a trench sunk on 12d Magnetite-green arkose ironstone 3b Dacitic flows and pyroclastic rocks dowan River, in a search for nickel mineralization. Several mag andesite, containing mariposite alteration, a quartz caroonatized 12e Magnetite ironstone 3c Aphanitic flows netic anomalies and four conductive zones were outlined. The vein, and a felsic dike. magnetic anomalies were interpreted by the company to be caus 12f Magnetite-red arkose ironstone 3d Fine-grained flows ed by ironstone and peridotite. In 1969. the same company drilled 12g Magnetite-mudstone ironstone 3e Porphyritic flow (feldspar phenocrysts) four diamond-drill holes for a total length of 2043 feet (623 m) on Kaspar Occurrence © 3f Medium-grained flow three different claims in the same area. Visible gold was reported Dy W.W. Bartley from quartz veins in METAVOLCANICS 3g Tuff breccia In the summers and later parts of 1968 and 1969. the Interna shattered diorite or this occurrence located in southeastern Black Calc Alkalic and Shoshonitic Metavolcanics 3h Tuff tional Nickel Company of Canada Limited drilled a total of eight well Township ÂFROl in 1944 ex 1945, J A McClosky of Sylvanite 3) Lapilli-tuff m) in diamond-drill holes for a total length of 4396 feet (1340 Gold Mine Limited earned out a program of channel sampling in II a Intermediate to felsic flows and pyroclastic rocks 3k Carbonated volcanic southwestern Blackwell Township, and two diamond-drill holes for the trenches on the property. He reported an assay of 0.52 ounce 11 b Mafic to intermediate flows and pyroclastic rocks 1318 feet (402m) in northwestern Laurie Township, in an area 3m Breccia with pyrrhotite gold per ion over 3 " teet (1 m) Irom sheared mineralized andesite 11c Tuff southwest of the Shebandowan River. tAFRQ} During :ê curreni survey, grab samples were taken from 3n Breccia, autoclastic (flow-top breccia) some ol tfw©i©e-©x-ês and pits on the occurrence and were 11d Tuff breccia 3p Hornblende phenocrysts analyzed by the Geos.-©p©ve Laboratories, Ontario Geological Sur 11e Hornblende-quartz-feldspar porphyry 3q Amygdaloidal flow GENERAL GEOLOGY vey, Toronto Three ^ sêse samples returned values of 0.01 1 if Porphyritic flow (hornblende phenocrysts), red 3r Silicified flow or pyroclastic ounce o* r*we poic .ê1 viz 001 ounce gold per ton from a The map area straddles the Abitibi (Shebandowan Belt section)- 10cm wide possancv.*. zone in mafic metavolcanics in a INDETERMINATE CONTACT Tholeiitic Basaltic and Andesitic Metavolcanics Ouetico subprovincial boundary and is underlain by Archean rocks trench located 2 K^ *t - southwest of the confluence of the mantled by Pleistocene and Recent deposits. The two townships Blackwell Shebando* sn and C** :aga Rivers, southeastern FELSIC INTRUSIVE ROCKS 2 Unsubdivided were previously mapped in two stages at a scale of 1 inch to 1 Townshic C 02 ou n ce pc êr ion from carbonatized. gossanous. mile by T.L. Tanton; in 1924, during the mapping of the Eastern 2a Aphanitic flow brecciatec -raite "ê:a--© iS"©C from the same trench mentioned 10a Biotitic felsite Part of the Matawin Iron Range (Tanton 1925); and in the period 2b Fine-grained flow above, and O 01 ewe p * per ;on from a massive sulphide zone 10b Felsite 1928 to 1930, when the adjacent area to the west, the Sheban 5 rn wtoe in sii©C©êc s ~- rv©f zed intermediate volcanic breccia 2c Medium-grained flow 10c Biotite granite with feldspar phenocrysts dowan Lake map area, was being mapped (Geological Survey of tn a - *es!-5outhwest of the confluence of 2d Amygdaloidal flow Canada 1930a, 1930b, 1931). A map sheet was published in 1938 100 Biotite tonalite the ©. -,~iaoa Rivers, southwestern Blackwell 2e Pillowed flow to show the results of this work (Geological Survey of Canada 10e Biotite granodiorite, pink 1938). Later, in 1973, both townships were remapped at a scale of 2f Carbonated flow 1 inch to a 1/4 mile by Fenwick and Weinstock (1973) More 10f Biotite syenite 2g Tuff, mafic 10g Hornblende-biotite granite recently, detailed studies of the Keewatin-type and Timiskaming- Kufcke* Occurrence 2h Silicified flow * I0h Biotite granite type sequences along Highway 11 within the map area were 2J Tuff carried out by Shegelski (1980; and Brown (1985). 10) Hornblende microgranite 2k Coarse-grained flow The Archean rocks comprise Keewatin-type metavolcanics ironstone in- r c - "*. © ~ s©3". ng-r/pe se- 10k Diorite 2m Olivine basalt consisting of komatirtic, tholeiitic, calc alkalic and high potassturr 10m Biotite-hornblende quartz monzonite calc alkalic and shoshonite rocks and interlayer metaseoi- -,s.~i /eir. f©orr, one of the pits 2n Blastoporphyritic flow (hornblende ©eurriec z -S©jf 43 t jwC C*f ©or ir ©964 ©Resident ments: interlayered metavolcanic rocks; mafic and felsic intrusive INDETERMINATE CONTACT pseudomorphs) rocks; Timiskaming-type metasedtments with interlayered high po -, of Nc^©Tefr1 3e;eiopment and 2p Coarse-grained flow Mines "© "uôe t tassium calc alkalic and shoshonitic rocks; and late diabase anc "V J3S METAMORPHOSED MAFIC INTRUSIVE ROCKS 2q Mafic flow with granitic bands lamprophyre dikes. 2r Amphibolite with large feldspar porphyroblasts The Keewatin-lype rocks underlie Laurie Township and the New Occurrence! 9a Gabbro, medium-grained 2s Gneissic flow southern part of Blackwell Township, south of Highway 11 These J "5)30(5 Trenches ©~-"© 9b Gabbro, coarse-grained rocks consist of an older, tightly folded, steeply dipping sequence tne oj"b- tj-*e, ©j-i\ W*: !are*i for goia and 21 Blastoporphyritic flow (hornblende and feldspar of subaqueous ultramafic to intermediate metavolcanics ana aeib"~M i",ations fr-yr r.,© © go^sanous rocK and 80 9c Gabbro, fine-grained pseudomorphs) metasediments which flank, on the north and south, a younger frorr 3-6©©." vfei© male© h © -a. rS Tie to*ns^©ps Five ol KASPAR OCCURRENCE 9d Diabase, fine-grained 2v Breccia, autoclastic (flow-top breccia) Keewatin-type subaerial intermediate to felsic metavolcanic and these saîpifet ©^turny: , ^ ^^ -.cfe of mrxe gold per tor 9e Diabase, coarse-grained metasedimentary sequence which forms a linear, east-trending - ©j*foiogical ûf- Komatiitic Ultramafic and Mafic Melavolcanics belt across south-central Laurie Township. ""O©OT.O, J 7 INTRUSIVE CONTACT The older Keewatin metavolcanic sequence consists of tnter- O ©4 Ou©-Ot 5010 8©rC - *©j .y per :o© from a -5 cm 1 Unsudivided layered units of komatiitic, tholeiitic, and calc alkalic affinity. wtde quarts êf r.© F ©©^ v/; (Tuneral©zed *ith chai- METASEDIMENTS (QUETICO-TYPE) la Ultramafic flow Ultramafic to mafic komatiites occur only on the northern flank of copy ne tJOfr it ana w i malachite and azurite, in- Clastic Metasediments 1 b Basaltic flow, grey the younger Keewatin central volcanic edifice. These komatiitic into ifef ©- v/^c r© ^ intermediate hornblende-rich, 1c Spinifex-textured flow rocks are characterized by spinifex textures, polygonal jointing, r,rfv.©va \ r\ ar old pit located 8a Wacke 1d Polyhedral-jointed flow pillows, and varioles, and form sequences up to 170 m thick , jr.we©jt-iT! corner ol Laurie 8b Mudstone Tholeiitic mafic lo intermediate units with massive, pillowed, and © r .e North Zone in southwest 1e Carbonated flow amygdaloidal varieties occur on both the northern and southern ern 8c Garnetiferous wacke if Basaltic flows, dark grey flanks of the edifice in southern Blackwell and northern and on f r on- ^ grad sample of sheared and 8d Siltstone lg Variolitic flows ountfc yMQ fv*:f ADJOINS LAURIE TP. P.3083 southern Laurie Townships. On the northern flank, calc alkalic malic /on arnc "r1.* containing pyrrhotite from Se Argillaceous siltstone 1h Breccia, autoclastic (flow-top breccia) rocks comprise feldspar-phyric basalts and aphyric andesine and I/fX: r V.K an ouK.rop locale^ 09 km north-north 8f Wacke with pegmatite leucosome and biotitic 1j Porphyritic flow (olivine phenocrysts) dacitic flows and tuffs, but these are absent on the southern side east of Lo*er f alK Mata*ir ^©ver. in northeastern Laurie melanosome 1k Pillowed flow of the edifice. Township. 8g Wacke with granitic and dioritic veins and pods 1m String-beef-textured flow The central part of Ihe volcanic edifice, located m the south- C 00? ounce gold pef ion from a graD sample from a car- 8h Wacke with dioritic veins central part of Laurie Township, consists of a younger Keewatin 1n Peridot!lie flow bonalized, Timiskaming t/pe metasediment oulcrop located 8j Wacke cut by pegmatitic veins sequence of pink and red, hornblende-rich, high potassium, calc km ©iUutrvsouthoa©it of the dam at Mcgraw Falls on the 1 5 8k Paragneiss alkalic to shoshonitic mafic, intermediate, and felsic rocks inter- Matawin River m oasl-contral Laurie Township, Notes layered with grey intermediate to felsic calc alkalic metavolcanics. 8m Migmatitic wacke with tonalitic leucosome a. This is basically a field legend and may be changed as a This area is dominated by coarse pyroclastic rocks consisting of D 001 ounce gold per ton Irom a grab sample from an an- T imibkamtng type mngiomerale outcrop located 8n Coarse-grained gneiss result of subsequent laboratory investigations. tuffs, l api Hi-tuff s, and tuff breccias, and is interpreted by the kentized of the dam at McGraw Falls on the author as a centra[-facies volcanic unit (Williams and McBirney 2 km 6ouiri-aouthoact b. No age relationships are inferred between or within these Matawin River m east-central Laurie Township and 48 34©45" 1979, p.312-313; Easton and Johns 1986). These rocks have been 48 34©45" groups. the subject of a detailed study by Chorlton (1987) in the western E 001 ounce gold pwr ton from a grab sample from a pyritized part of the belt. quart? vein of unknown total width in Timiskammg-type ar outcrop located at Middle Falls on the Matawin The Keewatin-type metasediments, which are interlayered with kose from an REFERENCES 1981: Kaministikwia Area (NTS 52 A/NW), District of Thunder Bay; SYMBOLS SOURCES OF INFORMATION River in east-central l aune Township GOLD MINERALIZED AREAS, BLACKWELL AND LAURIE TOWNSHIPS GOLD MINERALIZED AREAS, BLACKWELL AND LAURIE TOWNSHIPS the older and younger metavolcanics, consist of clastic and Ontario Geological Survey, Northern Ontario Engineering Lineation with basis of these results, and previous extensive prospec Brown, G. Heather Geology Terrain Study 57, 27p. Accompanied by Map 5045, chemical units. The clastic metsediments comprise conglomerates, On the Description and Location oz/ton oz/ton Description and Location Glacial striae plunge Base map derived from Forest Resources Inventory Maps. Lands ting, it is suggested that shear zones localed tn the area between 1985: A Structural and Stratigraphic Study of the Keewatin-Type scale 1:100000. Occurrence oz/ton oz/ton Occurrence wackes, argillttes, and graphic siltstones and mudstones which Nane Gold Silver and Waters Group, Ontario Ministry of Natural Resources. Highway 11 and the Shebandowan River, and on the river itself; and Shebandowan-Type Rocks West of Thunder Bay, On Name Gold Silver form sequences up to 100 m thick. On the southern flank of the Shegelski, R.J. Esker Geological Geology is not tied to surveyed lines. volcanic edifice, in southern Laurie Township, a highly pyritic the area at, and south-southeast of Middle Falls in Ihe Matawin tario: Unpublished M.Se. Thesis, Lakehead University, Thun River where carbonati/ed and sheared TimisKaming-type sedi der Bay, Ontario, Canada. 1980: Archean Cratonization, Emergence and Red Bed Develop boundary, observed Resident Geologist©s Files, Ontario Ministry of Northern Develop mudstone unit occurs which contains fine-grained disseminated Chilian (3) 9.45 13.48 from carbonatized andesite intruded by a Small bedrock ments and ironstone occur: and pyritized shear zones in the ment, Lake Shebandowan Area, Canada; Precambrian Re sheared and silicified mafic ment and Mines, Thunder Bay. pyrite forming up to IS©/o of the rock: this unit constitutes a marker Carter. M.W. (Laurie Township) quartz vein, in Keewatin-type netavolcanics B (New) 0.02 from outcrop high-potaesium calc alkalic and shoshonilic rocks in southwestern search, Volume 12, p.331-347. (Laurie Township) Keewatin-type metavolcanic rock containing Geological Assessment Files Research Office, Ontario Geological Survey, the lower tholeiitic metavolcanics. The chemical 1985: Precambrian Geology of Goldie Township, Thunder Bay in trench at Sand Lake (local name), horizon overlying Laurie Township be lurther investigated for their gold potential. pyrrhotite from outcrop 0.9 km boundary, position Toronto (AFRO). metasediments comprise grey and black chert, silicified graphitic District; Ontario Geological Survey, Map P.2855, Geological Tanton, T.L northwestern corner, Laurie Township. Area of bedrock interpreted north-northeast of Lower Falls, Matawin Eastern Part of Matawin Iron Range, Thunder Bay District, Ontario; units, and banded magnetic-j as per ironstone. These chemical l : Series-Preliminary Map, scale 1:15840 or 1 inch to 1/4 1925: Eastern Part of Malawin Iron Range, Thunder Bay District, Laurie Township. outcrop Kukkee (9) 1.43 not from quartz vein in trench in River, northeastern Geological Survey of Canada, Map 2069, by T.L. Tanton, 1925, metasediments form units up to 30 m in thickness. IRON mile. Geology 1984. Ontario: p.1c-27c in Geological Survey of Canada. Summary (Laurie Township) reported TImiskamlng-type magnetite-arkose ironstone, Lineament scale 1:63 360 or 1 inch to 1 mile. The Ouetico-type metasediments occur in northern Blackwell Report for 1924. Accompanied by Map 2069, scale 1:63 360 0.12 from carbonatized Timiskaming-type Iron occurs as oxide-facias ironstone units interlayered with Chorlton, Lesley Middle Falls, east-central Laurie Township. C (New) 0.02 Bedding, top Township and appear to be penecontemporaneous with the older or 1 Inch to 1 mile. metasediment from outcrop located 1.5 km Shebandowan Area, Thunder Bay District, Ontario; Geological Sur Keewatin-type metavolcanics in southeastern Blackwell Township 1987: Geological Selling of Gold Mineralization in the Western Part (Laurie Township) unknown; (inclined, Jointing; (horizontal. Keewatin-type rocks as the two are interlayered in their mutual south-southeast of the dam at McGraw Falls, vey of Canada, Map 338A, by T.L. Tanton, 1938, scale 1:63 360 or Township, and with Timiskaming-type of the Shebandowan Greenstone Belt, District of Thunder Williams, H., and McBirney, A.R. Kaspar (10) 0.52/3.7© not from sheared mineralized andesite in vertical) Inclined, vertical consist predominantly of wac and northeastern Laurie Matawin River, east-central Laurie Township. 1 inch to 1 mile. contact zone. These metasediments east- Bay. Northwestern Ontario; Ontario Geological Survey, Open 1979: Volcanology; Freeman, Cooper and Company, San Fran (Blackwell Township) reported Keewatin-type metavolcanics in trench of mudstones, siltstone- clastic metasediments at Middle Falls. Matawin River, in Magnetic Declination rOB©E in 1979. kes which are locally biotite-rich siltstones, central Laurie Township. Fite Report 5636, 348p., 4 tables, 30 figures, 93 plates, and cisco, California, 397p. unspecified location, about 2.2 km Bedding, top (arrow) Drag folds with mudstone couplets showing graded bedding, and garnetiferous west-southwest of the Shebandowan/Oskondaga D (New) 0.01 from ankeritlzed Timiskaming-type In Laurie Township, drilling by Monpre Mining Company Limit 1 appendix. from grain gradation; plunge wackes. As these rocks are traced northward into northern Black rivers confluence, southeastern Blackwell (Laurie Township) conglomerate from outcrop located 2 km (inclined, vertical, ed in 1956 and 1957 outlined B zone 1200 feet (366m) long and Easton, R.M., and Johns. G.W. NOTE: The marginal notes, legend, symbols, and abbreviations south-southeast of the dam at McGraw Falls, well Township, they become more highly metamorphosed, lose apply tp: Map P.3082 Precambrian Geology of Blackwell Town Township. overturned) their primary characteristics, and are converted into paragneisses 100 to 500 feel (30 to 152 m) wide, containing 17 000 000 tons of 1986: Volcanology and Mineral Exploration: The Application of Matawin River, east-central Laurie Township. Anticline, syncline CREDITS 26"/o soluble iron material which could be recovered by an open Physical Volcanology and Facies Studies; p.2-40 in Vol ship. District of Thunder Bay: Map P.3083 Precambrian Geology and migmatites. Locally, the rocks become coarser grained and of Laurie Township, District of Thunder Bay. Kaspar (10B) 0.02 from carbonatized, gossanous brecciated Bedding, top (arrow) form grey, biotile-rich, granoblastic tonalitic masses. pit operation, with a waste to ore ratio ol 1.07:1. Laboratory tests canology and Mineral Deposits, edited by John Wood and (Blackwell Township mafic Keewatin-type rock in trench 2 km E (New) 0.01 pyritized quartz vein of unknown total width Drillhole; (projected Geology by* M.W. Carter and assistants, 1986. done in 1968 on the material indicated that a product grading 66"/0 Henry Wallace. Ontario Geological Survey, Miscellaneous west-southwest of the Shebandowan/Oskondaga (Laurie Township) in Timiskaming-type arkose from outcrop at from cross bedding; Early mafic intrusions cut the Keewatln-lype and Quetico-iype (inclined, vertical, vertically, projected soluble iron could be obtained from raw material containing 29"/o Paper 129, 183p. rivers confluence, southeastern Blackwell Middle Falls, Matawin River, east-central up dip). Overburden rocks. These are lenses of dark-green, coarse-grained gabbro. soluble iron with a recovery of eS©/o of Ihe original iron. To LIST OF PROPERTIES, DEPOSITS, AND Laurie Township. overturned) Every possible effort has been made to ensure the accuracy of at Fenwick, K.G., and Weinstock, F.D. Township. shown The gabbroic rocks in the northern part of the map area occur produce 1.0 ton of concentrate, 3.57 tons of raw material would be , EXPLORED AREAS the information presented on this map; however, the Ontario Min the contact of the Keewatin-type and Quelico-type sequences. required. Although the iron deposits are not ot commercial signifi 1973: Blackwell and Laurie Townships, District of Thunder Bay: Kaspar (10G) 0.01 from 10 cm wide gossanous shear zone in Lava Dow; top istry of Northern Development and Mines does not assume any 75-79 in Summary of Field Work, 1973, by the Geological liability for errors that may occur. Users may wish to verify critical Felsic intrusive rocks occur in the northern and southern cance at present, an ironstone unit al the Kaspar Occurrence in p Abex Mines Limited [1953] (Blackwell Township) mafic Keewatin-type metavolcanics in trench (arrow) from pillows Unconformity extremities of the map area. These rocks are massive, biotite and Branch, edited by V.G. Milne, D.F. Hewitt, and W.J. Wolfe, and packing information; sources include both the references listed here, and Keewatin-type metavolcanics was reported to be auriferous Canadian Nickel Company Limited [1967-68] 2 km west-southwest of the shape hornblende-biotite granite, granodiorite, and tonalite with colour (AFRO) where veined by quartz stringers and impregnated by Ontario Division of Mines, Miscellaneous Paper 56, 202p. Shebandowan/Oskondaga rivers confluence, Location of property information on file at the Resident or Regional Geologist©s office indices varying from 7 to 2. These rocks intrude the Quetico-lype pyrite and arsenopyrite. Similar indications were derived from the Geological Survey of Canada Canadian Nickel Company Limited [1969] southeastern Blackwell Township. ABBREVIATIONS Schistosity; and the Mining Recorder©s office nearest the map area. sedimentary rocks in the north, and the tholeiitic Keewalin-type KuKkee Occurrence at Middle Falls, Matawin River, in I930a: Other Field Work; p.lOSc in Geological Survey of Canada, Chilebovec, J.J. et at. (horizontal, inclined, Mineral occurrence sedimentary rocks in the south. Their relationship to the mafic in Timiskaming-lype metasediments. where the ironstone is intruded Summary Report for 1928, Part C. Corporate Oil and Gas Limited [1983] Kaspar (10H) 0.01 from a massive sulphide zone 5 m wide Ag...... Silver vertical) at surface Issued 1987 intrusive gabbroic rocks is not directly observable. (Blackwell Township) silicified and pyritized intermediate by qua rt z-cor bon ate veins near a shear zone. It is suggested that 1930b: Other Field Work: p.45c in Geological Survey of Canada, Docking, R.W. ef a©. Au...... Gold Timiskaming-type metasediments occur in the southern part of ironstorms be tested for their gold potential where cut by quartz or Keewatin-type metavolcanic breccia, in Information from this publication may be quoted if credit is given. Summary Report for 1929, Part C. Falconbridge Nickel Mines Limited [1962] trench 2.5 km west-southwest of the Cu...... Copper Gneissosity; Gold mineralized Blackwell Township, straddling Highway 11, and in the north- quartz-carbonate veins and/or mineralized with pyrite and ar inclined, It is recommended (hat reference be made in the following form: 1931: Other Field Work; p.134d in Geological Survey of Canada, International Nickel Company of Canada Limited [1966] Shebandowan/Oskondaga rivers confluence, (horizontal, area central part of Laurie Township, forming an east-trending belt. senopyrite gf...... Graphite vertical) These metasediments consist of oligomictic conglomerates and Summary Report for 1930. Part D. International Nickel Company of Canada Limited [1969] southeastern Blackwell Township. clasts of predominantly intermedi 1938: Geology, Shebandowan Area. Thunder Bay District, Ontario; Pb...... Lead Ironstone paraconglomerates containing NICKEL Lacana Mining Corporation (Kaspar Occurrence) [1982] ate, horn blende-bearing, calc alkalic and shoshonitic rocks, less Geological Survey of Canada, Map 338A, scale 1 inch to 1 A (New) 0.14 0.40 from a 15 cm wide quartz vein mineralized po ...... Pyrrhotite Foliation; (horizontal, Carter, M.W. Lofgren, Allan Township) inclined, vertical) common granitoid rocks, black chert, and jasper in an arkosic or No assays lor nickel have been recorded in the assessment files mile. Geology by T.L. Tanton 1928, 1929, 1931. (Laurie with chalcopyrite, bornite, secondary Bay Noranda Exploration Company Limited [1976] sericitized, py ...... Pyrite 1987: Precambrian Geology of Blackwell Township, Thunder chloritic matrix. Siltstones. mudstones, and arkoses also occur. nickel mineralization in the map area. During the malachite, and azurite in from areas of Mollard, D.G., and Mollard, J.D. mafic to Intermediate Keewatin-type District: Ontario Geological Survey, May P.3082, Geological Chemical metasediment comprise banded magnetite-jasper, curreni mapping program, units of ultramafic and mafic komatiites Rantatalo, Selma qcv...... Quartz-carbonate vein Banding; (horizontal, Series-Preliminary Map. scale 1:15840 or 1 inch to 1/4 magnetite-arkose, and magnetite-mudstone units best exposed In 1980: Lac des Milles Lacs Area (NTS 52 B/NE), Districts of Rainy Ross, Glougie hornblende-rich shoshonitic tuff breccia, inclined, vertical) have been mapped m the southern part of Blackwell Township River and Thunder Bay; Ontario Geological Survey, Northern in old pit 3 km north-northeast of the qv ...... ,...... ~...... Quartz vein mile. Geology 1986. the central part of Laurie Township where the unit is about 150 m south ol Highway 11, and in northern Laurie Township. These rock Ross, W. E thick Timiskammg-type metavolcanics occur associated with Ihe Ontario Engineering Geology Terrain Study 56, 28p. Accom southwestern corner of Laurie Township. Zn...... Zinc types are of significance in Ihe search lor nickel mineralization, panied by Map 5074, scale 1:100000. Swazey, D. arxj although no sulphide bodies were found on surface, it is Tees, G.R. suggested that i he se units bo prospected (or Iheir nickel potential.