Preliminary Report, Geology of of the East Half of Daniel Township and of the West Half of Isle-Dieu Township, Abitibi-East County

RP 503(A) PRELIMINARY REPORT, GEOLOGY OF OF THE EAST HALF OF DANIEL TOWNSHIP AND OF THE WEST HALF OF ISLE-DIEU TOWNSHIP, ABITIBI-EAST COUNTY

P.R. NO. 303

DEPARTMENT OF NATURAL RESOURCES

RENÉ LÉVESQUE, MINISTER P.E. AUGER, DEPUTY MINISTER

Geology of part of the EAST HALF OF DANIEL TOWNSHIP and of the WEST HALF OF ISLE-DIEU TOWNSHIP ABITIBI-EAST COUNTY

PRELIMINARY REPORT by John I. Sharpe

80° 8° 76° 74° 12°

Eastmain 5_ —__— 52 G~~ _".---- _ ------~/lR- T • R A I F. Rafe l A IIM R,S de ! Rnprrr l Baf'eds. Rupertlloure r ~ H nnah ~ R. de Raprrt L. NE^uxnu ~-_l' I ~ ! ~ • —~" L Asaa /~ 1 { .p - - -../t: ~ % ;.~ i ~~, '~~ 7 > ~•,_ ~ ~ i 'o.----..„.-41:~ I. hran° 1 ~ ` I' ~~ L. Albvne ~ ' I. ~ ~ 1-. ~~ H_HvulM~~ e7ij'Ji ~/iJiJ é / : _. ~ t.", ~ (fir L`y;,J ~ $ Z f-V L. .fi rv'n'~rn 7~ I Q U É B J E , % C . . . . ..-.._ _ IWL; nirlu } so° ___ --- . ~ ~ ~ 1 ~ C. P~ _ . in ._ 50 Z 1508 .~Ly u rd ~i u- ~wo o~~ 1 L ( a~~L (..,llaw , .~ - Clûpau~ r~l ~ •.,,,,W Malaga ~f,M ~6 t • ~ L. ()18a a.m.r~.. 'r 4 ' S ~ i r L. Waru.alfp~1 . Y_.. ~ ? ~ é ' ~ ~ ~ ~ ,,..77~ ~ ~> ~ I I ~ jrt..Wfrac~~ L. Fnlnrr ~ I ~ ',i I.'QaGilion olB~e u y' Mu k iI rille ' ` . I ! du Male nt DL . fp L. .i64fbf ~Rrn1 Ÿ ~~1. 1y G ra 6 [ rrny. _ ~ ..~ St-FRbl„ J .~ Fand. nnetetrr~ ~ N - v,{ I• 1 ~ I L. Malnrr y 1`SFHV/1H , _ GOIIIN r m~ i Vdd'Or! L IHun _ - â 45 ' 48°..._ _. -~_. ~_ ... . _._. -- i 4H ( T~ . .. . . ...N _..__. Mlei . aT ;_~', BO° '78 ° 76° 74° 72°

QUÉBEC

P.R. NO. 503 1964

P. R. NO. 503

QUEBEC DEPARTMENT OF NATURAL RESOURCES

RENÉ LÉVESQUE, MINISTER P.-E. AUGER, DEPUTY MINISTER

MINERAL DEPOSITS SERVICE

PAUL-E. GRENIER, CHIEF

GEOLOGY

OF PART OF THE EAST HALF OF DANIEL TOWNSHIP AND OF THE WEST HALF OF. ISLE-DIEU TOWNSHIP

ABITIBI-EAST COUNTY

PRELIMINARY REPORT

J. 1. SHARPE

QUEBEC 1964

P. R. NO. 503

PRELIMINARY REPORT on

PARTS OF DANIEL AND ISLE-DIEU TOWNSHIPS ABITIBI-EAST COUNTY

John I. Sharpe

INTRODUCTION Daniel and Isle-Dieu townships are located 80 miles north of the town of Amos and in the Matagami Lake region of northwestern Quebec. A large-scale search during the last four years has led to the discovery of several copper-zinc deposits in the region. The Quebec Department of Natural Resources has undertaken this mapping project so as to provide detailed geological information on the district, including an integration of the data gathered by private companies during the past few years. The area studied covers ranges T to VII in the west half of Isle-Dieu township and ranges I to VII in the east half of Daniel township; this area of 70 square miles is bounded by latitudes 49043'56" and 49°50'06" and longitudes 77°39'l7" and 77°52'36".

The new, 110-mile-long Matagami Lake road extends from Amos to the Matagami townsite near Bell river. A road leading to Allard river and New Hosco.Nines_ branches from the main road some 5 miles southwest of the townsite and crosses the southeast part of the map-area. Chartered air-transportation is available at Senneterre, Amos and Noranda and float-planes land on Allard and Bell rivers and Lalanne lake. The geologic mapping involved field traverses at intervals of 400 feet, logging of most of the drill core in the area and the integration of these data with the detailed ground magnetometer surveys carried out by mining companies. The writer is indebted to the companies and individuals who provided aid in gathering this information.

The area lies within the region once inundated by. the glacial lake Barlow-Ojibway and exhibits a characteristic flat topography subdued by deposits of silt and varved clay. Rock knolls and ridges of glacial debris, oriented north-south, provide local relief of 50 to 150 feet. Outcrops are scarce except in the vicinity of Ouabassi, Hatagami and Lalanne lakes. - 2 - Drainage is provided by numerous small and swampy brooks which drain into Allard or Bell rivers or Matagami lake and thence into James bay via Nottaway river. GENERAL GEOLOGY The map-area is underlain mainly by folded volcanic and intrusive rocks of early Precambrian age. These rocks constitute part of an important volcanic and sedimentary assemblage within the Superior Province. This assemblage extends eastward to the Chibougamau region and westward across the Ontario- Quebec provincial boundary. The volcanic rocks of the area range from metamorphosed rhyolite to thick flows of relatively fresh dacite and andesite-basalt. Intercalated with these rocks are thin bands of tuff and agglomerate. Gabbroic and anorthositic rocks are intrusive into, and folded with, the volcanic sequence, all of which is cut by small masses and dykes of granitic rocks. The youngest intrusive rocks are Keweenawan=type diabase dykes which traverse trie area in a northeast direction. The predominant structure is believed to be a large anticlinal fold that plunges west and whose axial zone extends west-northwest across the map-area. 3

Table of Formations

RECENT AND Fluvial and paludal deposits PLEISTOCENE glacial-lacustrine clay and silt, boulder deposits

LATE Keweenawan-type gabbro-diabase dykes PRECAMBRIAN

Younger Hornblende granite, aplite, Intrusives quartz feldspar porphyry dykes-, syenite. porphyry Intrusive dykes* Rocks Bell River complex and related Older rocks; gabbro, anorthosite, Intrusives amphibolite, diabase, perido- EARLY tite, diorite, lamprophyre dykes* PRECAMBRIAN

Dacite- Andesite-basalt lavas andesite Volcanic Group Dacite, trachyte, rhyolite lavas, tuff, agglomerate, chert Rocks Spherulitic Metarhyolite, spherulitic Rhyolite rhyolite, intermediate lavas, Group tuff, agglomerate, chert

*Age relations uncertain.

Volcanic. Rocks

The volcanic rocks form two distinct assemblages. The older group consists of metamorphosed rhyolite, rhyolite and intermediate lavas dnd pyroclastics. These rhyolitic rocks are characterized by spherulitic textures and "quartz-eyes" and will be termed the "spherulitic rhyolite group". The second unit overlies the first and consists of thick flows of dacitic and andesitic or basaltic composition. These will be termed the "dacite-andesite group". Many of these rocks exhibit low-grade metamorphism of the green- schist facies. There is some intermixing of the rhyolitic rocks in the dacite-andesite group, and vice-versa, which results in considerable uncertainty regarding exact stratigraphie relations over much of the area. For these reasons, only lithological di- visions are shown on the preliminary map. Spheruiitic Rhyolite Group The spherulitic rhyolite group occupies a tongue-shaped area extending from the southeast corner of the area to the south part of the New Hosco Mines property. The position of the contact shown on the map is based on scanty data, but the distinctiveness of the rock types and marker horizons in the overlying dacite- andesite group allows a liberal interpretation to be made. The contact extends northwest from Lalanne lake and towards the large bay in Allard river where it turns ând extends eastward for several miles.

The least altered rocks of this group occur near the periphery of the unit such as at the Bosada Syndicate property near Lalanne lake. The drill core here consists of massive, hard and grey spherulitic rhyolite which grades into normal light-grey rhyolitic rocks. The spherulitic rocks consists mainly of light- coloured and spherical to ovoid masses measuring from less than 1 mm. to 6 mm. in size and having selvedges of chloritic and seri- citic material. Vitreous grains of quartz are also present. Iden-. deal rocks are present east of New IIosco Mines property; here,. however, the spherulitic lavas are admixed with texturally lacy siliceous rocks containing pyroclastic material and flows of dark green andesite. Discontinuous bands of fine-grained laminated tuff, coarser tuff, agglomerate and chert commonly occur near or at the contact between the spherulitic group and the overlying dacite- andesite group. The metamorphosed equivalents of the spherulitic rocks outcrop north of Lalanne lake and on the Norvalie property in the central part of the map-area. These rocks are mainly sericite- chlorite schists characterized by numerous quartz grains or"eyes" up to 1 cm. in diameter. Outcrops have a rough pitted surface owing to protruding quartz grains and etched clots of chlorite. The broken surface of the rock is a nondescript dull grey, whereas the weathered surface shows an aggregation of fine siliceous spherulitic grains in a matrix of secondary micaceous minerals. Other rock types in the spherulitic rhyolite group are poorly exposed. North and east of Lalanne lake there are outcrops of fine-grained, dark-green chlorite rocks with, in some places, numerous civartz-eyes and spherulitic zones. These are associated with massive, dense and even-grained grey rocks which are believed to be intermediate lavas. No estimate of the thickness of this rhyolitic group is possible due to the folded nature of the unit and the intercalation of gabbroic sills. Dacite-andesite Group A thick assemblage of relatively fresh lavas is present a tratigraphically above the spherulitic rhyolite group. These rocks,which underlie most of the southwest corner of the map-area, 5 are seen in outcrops along Allard river and extend easterly to underlie Matagami lake. Thus the group constitutes the outer zones of an anticlinal structure the core of which is occupied by the older spherulitic rhyolite group. The lower portion of the group consists mainly of hard and dense, light-green pillowed lavas. A characteristic feature of these lavas is an abundance of amygdales filled with quartz and rosettes of a yellowish green mineral of the clinozoisite-epidote series. These lavas are tentatively classed as dacites. They are interbedded with more feldspathic porphyritic lavas of tra- chytic aspect and with very hard siliceous lavas of rhyolite or rhyo-dacite composition. Outcrop surfaces are characterized by irregular fracturing, generally light tones and round pillows. Bands of tuff, coarse breccia, agglomerate and bombs are common features. A distinctive marker horizon of variolitic dacite, approximately 400 feet thick, outcrops adjacent to range-line V-VI near Allard river and it can be traced at intervals to the east for a distance of some 4 miles. This rock shows abundant spherical or orbicular structures from 5 mm. to 2 cm. in diameter; these spheres are white to green in color, have a dense or cherty texture and are embedded in a fine-grained groundmass of chloritic material. A gradual transition from the variolitic rock to massive lava was observed in drill core from this horizon. North of the marker band and in the vicinity of Matagami lake, the .volcanic rocks consist mainly of dark green, dense or granular lavas of andesitic and basaltic composition. These are predominantly pillowed flows with intercalated fine- to medium- grainéd massive flows or sills. The general aspect of the lavas, and particularly the coarser porphyritic types, is similar to that of the gabbroic sills and dykes which intrude the spherulitic rhyolite group. Dacitic lavas, such as those described previously, are interbedded and intercalated with the basic lavas but, judging from the general fold pattern, the basic lavas would seem to be the dominant lithological type in the upper part of the dacite-andesite group. Inter-flow bands of tuff and agglomerate are common throughout the lava sequences and, where observable, they are irregular in width and tend to pinch out erratically. Some bands can be traced several thousand feet. A band of bedded silty tuffs is exposed on islands north of Sinclair island in Matagami lake. There are highly schistose and contain considerable iron-bearing carbonate which stains the outcrops brown. A thick section of tuffs and agglomerate has been intersected by drill holes in the northwest corner of the area. These are intercalated with altered lavas of variable composition. Graded bedding is visible in some of the core and, in some sections the general aspect of the rock is that of a bedded sediment. It is uncertain whether these rocks are a facies of the dacite-andesite group or a reappearance of the older spherulitic rhyolite group 'in an anticlinal structure. Intrusive Rocks.

The intrusive rocks of the area fall into three cate- gories: a) a complex of sills and dykes of gabbroic rocks related to the Bell River complex, b) small granitic masses and dykes which intrude the gabbroic rocks and c) dykes of Keweenawan-type diabase and gabbro.

Bell River Complex

The Bell River complex of gabbroic rocks has been described by Longley* and others as a folded intrusive complex of layered gabbro, anorthosite, and ultrabasic rocks. The nose of this complex extends into the southeast corner of the map-area where the intrusive takes the form of'irregular apophyses, sills and dykes intruding the volcanic rocks. Most of the gabbroic rocks contain appreciable magnetite and yield strong magnetic anomalies. It should be noted that the disposition of these rocks as indicated on the map is based mainly on data derived from ground magnetometer surveys. The rock types are extremely variable in composition and degree of alteration. The scanty exposures and drill cores in the main intrusive mass consist of altered, very coarse-grained gabbros, massive greenish amphibolite, coarse black hornblendite or pyroxenite, coarse quartz-rich chloritized rocks, aplitic zones and coarse granulated anorthosite. The dykes and sills further to the northwest are more uniform in appearance. They are mainly fine- to medium-grained massive dark green rocks composed of 30 to 40 per cent saussuritic feldspar, the remaining constituents being black hornblende and altered pyroxene. Textures vary from granular to porphyritic or diabasic. These rocks are believed to be mainly gabbros. Some of the larger sills contain large subhedral phenocrysts of opaque grey-green feldspar. The phenocrysts are so abundant in some cases that they are the main constituent and the rock becomes anorthositic. Other minor types of the gabbroic assemblage include dark ultrabasic dyke rocks and small hornblende and biotite lamprophyre dykes. Medium-grained rocks containing small amounts of dark constituents and a few grains of quartz were termed diorites in the field. These are associated with the darker gabbros and may be an altered equivalent of anorthositic gabbro.

*Kitchigama Lake Area, Abitibi Territory; Que. Dept. Mines, G.R.l2 (1943). Granitic Rocks

Medium-grained hornblende granite outcrops on the shore of Matagami lake near the mouth of Allard river. The rock is bright red in color, massive and relatively fresh. Presumably it is related to granitic rocks that intrude the Bell River complex else- where in the region. Small dykes Of quartzfeldspar porphyry, syenite porphyry and aplite are common. These may be seen to intrude the gabbroic rocks such as in the drill cores and outcrops along Allard river in the west central part of the area. Keeweenawan-type Gabbro

Several dykes of coarse-grained fresh gabbro traverse the area in a northeast direction. Two of these, arranged in an en échelon fashion extend from the southwest corner of the area to Matagami lake. A large outcrop of diabasic gabbro may be seen in range II near the shore of Allard river.

Pleistocene and Recent Deposits

Thick deposits of glacial and glacial-lacustrine material cover most of the area. The average thickness of these deposits, judging from diamond drill records, is 50 to 75 feet. The upper- most sediment consists of varved clay, silt and sand deposited by glacial lake Barlow-Ojibway. These overlie boulder deposits presumably of till and moraine. A broad and low ridge, oriented north-south, lies one mile east of Allard river in ranges III and. IV. Large glacial erratics and poorly-sorted gravel are occasion- ally seen along the flank of this ridge. Another large mound possibly of glacial origin is present two-thirds of a mile south of the most southerly shore of Matagami lake.

Paludal deposits cover much of the area and wide beaches of clayey silt are exposed along Allard river and Matagami lake when water level is low.

STRUCTURE

Folds Top directions, as determined from pillowed lavas and the distribution of lithological types, indicate that a large westerly- plunging anticlinal structure extends from the southeast corner of the map-area to the large bay in Allard river in the west central part of the area. Along the south flank, the rhyolite-dacite contact dips south at 4+0 to 60 degrees. On the north flank, the dips are generally steeply north. The complicated patterns expressed by the gabbroic rocks and certain distinctive contacts within the volcanic assemblage sug- gest that numerous small asymmetrical folds are impressed on the larger anticlinal structure. B

A synclinal axis extends in a west-southwest direction across Matagami lake and may extend westward to account for the south-facing andesitic rocks near Allard river. North of this syncline in Matagami lake there is an outcrop of pillowed aride- site which faces north; this may imply that a complementary anticlinal fold is present north of the synclinal axis. Faults and Shear Zones

The rocks of the older spherulitic rhyolite group are commonly schistose and zones of intense shearing and carbonatiza- tion have been intersected in drill holes along the southwest flank of the main anticlinal structure.

Several strong shear zones are seen on islands in Mata- gami lake. The largest of these is localized in a band of tuffs and lavas, located north of Sinclair island, which extends west- southwest toward similar rocks on the shore of the lake.

Transverse faults, oriented approximately northwest or northeast, have been recognized in areas of abundant outcrops such as in the northeast corner of the map-area. An assumed fault, trending northwest, cuts the synclinal axis in Matagami lake and offsets this structure some 1,000 feet, the east side having moved north relative to the west side.

ECONOMIC GEOLOGY Base Metal Deposits In June 1957, the Mattagami Syndicate discovered zinc- copper ore two miles southeast of Lalanne lake. Since that time the region has undergone an intense and rewarding search for addi- tional ore'deposits. Owing to the thick overburden, the primary exploration methods used have been magnetic and electromagnetic surveys.

To date, one mineable deposit of copper and zinc plus a number of important sulphide occurrences have been found within the map-area. The mineable deposit is that of New Hosco Mines, located adjacent to Allard river in range IV of Daniel township. The most important occurrences of sulphides are those of Radiore Mines in range IV, Isle-Dieu township, along the eastern limit of the map-area, and the Daniel Mining occurrence, Daniel township, in the northwest corner of the area. Other mining properties, such as that of the Bosada Syndicate, are known to be underlain by smaller zones of pyrite and pyrrhotite mineralization containing minor amounts of base metals.

Two important factors concerning the distribution of these deposits or occurrences, excepting the Daniel Mining occurrences, are to be noted. The first factor is the proximity of 9 these occurrences to the contact between the spherulitic rhyolite group and the overlying dacite-andesite group; the second concerns the localization of the mineralization either within, or adjacent to bands of tuff, agglomerate and chert within this contact zone. Similar relations exist south of the map-area at the Mattagami Lake Mines and Orchan Mines deposits. The latter deposits are on the south limb of the major anticlinal structure described previously whereas the New Hosco and Radiore deposits lie on the north limb of the same structure.

Many outcrops of the more basic lavas and pyroclastic rocks contain a few discrete grains of chalcopyrite.. The volcanic rocks surrounding the small granite intrusion near the mouth of Allard river are noteworthy in this respect. At least 40 companies have conducted exploration programs within the map-area and 30 of these completed diamond drilling programs. Some of these properties are described below.

Daniel Township

Bosada Syndicate (New Calumet Mines Ltd.) The Bosada Syndicate holds 20 claims located just northwest of Lalanne lake. The company carried out magnetometer and electromagnetic surveys and drilled 21 holes in 1958 and 1959. Most of these holes were directed north across a favourable contact between spherulitic rhyolite and dacite. Small amounts of pyrrhotite and pyrite, with disseminated chalcopyrite and sphalerite, were intersected by the drill holes. The sulphides are disseminated in thin bands of chert and tuff or are within narrow fractures in lavas. The work was supervised by Mr. P. Cunningham-Dunlop of Hail- eybury, Ontario.

Daniel Mining Co. Ltd. Daniel Mining holds a group of claims along Gouault river, in Daniel township. Only the southeast part of the property is included in the map-area. The company completed airborne and ground magnetic and electromagnetic surveys in 1958 and 1959. During 1959 twenty-seven drill holes evaluated the results of these surveys. Most of these holes are located in the southeast corner of the property where a zone of pyrite-pyrrhotite-chalcopyrite-sphalerite was discovered. The mineralized zone occurs in a band of altered tuff and agglomerate. The zone is oriented S.75°W. and dips south •at 70 and 75°. It is 350 feet long and 5 to 30 feet wide. The tenor is reported by the company to range from 0.4 to 2.6 per cent copper, 1.2 to 1.8 per cent zinc and 0.20 to 1.36 ounce of silver per ton. - 10 -

Irregular masses of gabbro occur north and south of the mineralized zone.

New Hosco Mines Ltd.

Ref.: Graham,.R.B. Geology of the New Hosco Mines Limited Copper- Zinc Deposits, Mattagami. Area, Quebec (Abstract); Can. Mng. Jour. Vol. 81, No.4, p.94, 1960.

Latulippe, M. The Mattagami Area of Northwestern Quebec; Geol. Ass. Can. Proc. Vol. II, p.50-51, 1959.

Description of Mining Properties Examined in 1960; Que. Dept. Nat. Res., P.R. No. 472, pp. 8, 9. (1962).

New Hosco Mines Ltd. holds 40 claims which straddle Allard river in ranges IV and V, Daniel township.

A deposit of massive sulphides was discovered in 1958 by drilling a combined electromagnetic-magnetic anomaly located near the west shore of Allard river. From 1958 to 1960 over 122,300 feet of drilling was done. Most of the drilling was concentrated in the central part of the property, but a portion was drilled to explore the east and, west extension of the sulphide zone along a total length of some 8,500 feet.

The deposit consists of disseminated, banded and massive pyrite and pyrrhotite containing chalcopyrite and sphalerite arranged in lensoid, coalescing zones which plunge 40 to 50 degrees in a direction north of west. The width of the main mass of sulphides is 150 feet and the east-west strike length measures 700 feet. Mineralization persists to at least 1,000 feet below surface. The deposit is zoned; the best zinc values occur to the north and the best copper values occur in a central zone which is enveloped in part by nearly barren pyrite and pyrrhotite. Magnetite occurs irregularly throughout the deposit and is enriched in the footwall sectors.

The sulphides are confined to a band of carbonate-bearing, chlorite tuff and agglomerate which contains irregular horizons of cherty rocks and spherulitic rhyolite. These strike S.80°W. and dip steeply north. An outcrop of pillowed dacite located 3,000 feet northwest of the ore zone faces north;thus the deposit is believed to lie within the north limb of the major anticlinal structure which traverses the area. The tuff-agglomerate band lies near the contact zone between the spherulitic rhyolite group and the overlying dacite-andesite group.

Irregular sill-like masses of gabbro occur south and east of the sulphide zone,and fine-grained dykes resembling the chilled portions of the gabbro traverse the mineralized zone. The company estimates that the deposit. contains 2,450,000 tons containing 2.64 per cent copper and 960,000 tons containing 7.96 per cent zinc.

On the basis of these estimates, New Hosco Mines commenced shaft sinking in the spring of 1962 and the mine is expected to be in production by the end of 1963. The shaft and working levels are to extend to about the 1000-foot level; this program of shaft sinking and establishment of level stations was approaching completion at the end of 1962. Newlund Mines Ltd. Newlund Mines holds a group of claims in Daniel township immediately east of the New Hosco property near Allard river, and another group southeast of Daniel Mining Co. Ltd. The first property had been previously held by Ventures Ltd., which. carried out magnetic and electromagnetic surveys and drilled 3 holes. Newlund started drilling in 1961 and during the writer's last visit to the property in September 1961, hole number 7 was being drilled. The holes are located along the presumed extension of the New Hosco lithologic sequence. Hole No. 1 was directed south and collared in cherty tuff with disseminated pyrite and then entered gabbro and andesite. The remaining holes are located south of the first and transected andesite, cherty tuffs, spherulitic rhyolite, gabbro and feldspar porphyry dykes.

Newmont Mining Corporation of Canada Ltd. (property now held mainly by Noranda Mines)

The Newmont Mining Corporation held a block of over 190 claims which extended from Allard river in Daniel township eastward into Isle-Dieu township. The company conducted extensive magnetometer, electromagnetic, induced polarization and geological surveys and drilled 22 holes during the period 1958 to 1960. Several holes, located northwest of Lalanne lake, intersected a thin band of cherty tuff with pyrrhotite, pyrite and traces of chalcopyrite. Ventures Limited

Ventures held an extensive block of claims which straddled Allard river in ranges VI and VII, Daniel township,and extended eastward to Matagami lake in Isle-Dieu township.

The company completed extensive geophysical surveys and drilled 12 exploratory holes for a total of 5,951 feet in the period 1958 to 1960. - 12 -

Isle-Dieu Township Norvalie Mines Ltd.

Norvalie Mines holds a block of 36 claims located mainly in range III, Isle-Dieu township. These extend westward into Daniel township.

The company did magnetic and resistivity surveys in 1957 and 1958. Ten holes have been drilled. Most of these are located in the northeast corner of the property where.gabbro- anorthosite sills and altered siliceous volcanic rocks were intersected.

Radiore Uranium Mines Ltd.

Radiore Uranium Mines holds a block of 91 claims in the central part of Isle-Dieu township. Only the western three- quarters of the property is included in the present map-area. A deposit of copper-zinc was discovered in 1959 during the testing of electromagnetic and magnetometer anomalies. In 1959 and 1960, 40 holes were drilled; most of these tested a sulphide zone located 1,000 feet west of the intersection of range- line III-IV with the north-south centre-line of the township.

The deposit consists of a lenticular body of massive and disseminated pyrite and pyrrhotite containing variable amounts of chalcopyrite and sphalerite. The mineralization is confined to a band of carbonate-bearing ch]oritict' Sd agglomerates which are interbedded with narrow cherty sediments, andesite lavas and spherulitic lavas. These strike N.80°W. and dip steeply. The pyroclastic band is adjoined to the north by massive dacitic lavas, possibly the basal portion of the dacite-andesite group. A semi-concordant gabbro dyke of the Bell River complex lies south of the sulphide zone and strikes N.60°W., cut- ting across the volcanic beds and truncating the western end of the sulphide body. The dyke dips steeply north and in places truncates the sulphide zone at depth. The deposit is strongly zoned. The north portion consists of a tabular body of massive, banded pyrite, pyrrhotite:, magnetite, sphalerite and chalcopyrite with local concentrations of bismuth, bismuthinite and gold. This zone is 10 to 35 feet wide, 700 feet long, and extends to an approximate depth of 300 feet. Immediately south of this zone is a smaller lensoid mass of pyrite and pyrrhotite enriched in copper and containing only minor amounts of sphalerite. This copper zone has its apex approximately 200 feet below the surface. - 13 -

Gold and Silver No significant amounts of gold or silver (aside from those associated with base metal deposits) have been found in the area. Some low assays have been reported from pyritic quartz veins intersected in drill holes. Low gold values and some chalcopyrite occur in quartz veinlets within the sheared and carbonatized zones exposed around Matagami lake (see Longley, p. 28-31*). Gravel and: Sand Deposits Quantities of sand and gravel appear to be scarce within the map-area. The two ridges mentioned in the previous section on "Pleistocene and Recent Deposits" are possible sources, espe- cially the ridge east of Allard river in ranges III and IV. Drill holes in this area indicate deposits of coarse unconsolidated mate- rials composed, in part, of sand and gravel. These are blanketed with silt and clay deposits and thus will require considerable stripping before evaluation is possible.

Reference cited page 6.