Report on Mag Survey

GM 03291-A REPORT ON MAG SURVEY

de-~ PHONEal()X8XXX P. O. BOX 880 4-6295 KOULOMZINE, GEOFFROY 8c Go. SUCCESSORS TO TECHNI-COUNSEL LIMITED GEOPHYSICAL AND GEOLOGICAL PROSPECTIN QUEBEC DEPARTMENT OF MINES

TH. KOULOMZINE, L.Sc. INO. ENSP. PARIS S STRASSSOURG UNIVERSITIES P. R. GEOFFROY, M.E. ECOLE POLYTECHNIOUE,PARIS MINERAL DEPOSITS BRANCH

1563 71 STREET No G VAL D • Report on the MAGNETOMETER SURVEY of the property of NEW LAGUERRE MINES LIMITED Landrienne Township, Quebec by Leo Brossard, M.Sc. and T. Koulomzine, L.Sc. Ing. ENSP June - July 1955. INTRODUCTION The recently acquired property of New Laguerre Mines Limited in the Lacorne-Landrienne area consists of eight claims numbered C-79404, cis. 1 & 2, C-79405, cis. 1 & 2, C-79406, cls. 1 & 2, C-79409, cls. 1 & 2 and com- prising lots 46 to 49, Ranges I and II, Landrienne Town- ship. Each lot covers slightly more than 100 acres and the actual area of the group is 845.15 acres. The location is about three quarters of a mile north of the Quebec Lithium ground, where an important deposit of lithium ore is now being prepared for production; adjacent claims on the east and south are held by Sullivan Consolidated and American Lithium respectively. The property is only about 10 miles from the town of Barraute and can be reached most conveniently through the so-called "penetration road" of Landrienne Township which extends throughout its length; in addition, easy access to the eastern section is provided by a new road which has just been bull-dozed between Ranges I and II and by the Quebec Lithium railway which crosses the northeastern corner. The object of the magnetometer work was to guide a proposed exploration campaign by outlining the geological structures, under the extensive sand ridge that covers prac- tically the entire property; sulphides are known to occur in the immediate vicinity and it was also hoped that the survey might directly indicate the presence of base-metal deposits undetectable by other geophysical methods under such deep overburden.

GENERAL GEOLOGY

There are several 'püblicatiôns, both federal and. provincial, on-the geology of the district; map No. 999A entitled "Piedmont" and issued in 1950 by he Geological Survey of Canada.is.a compilation of all. information available at that date._ Since then. nothing new has been.published on the area including the New Laguerre property, but the : lithium deposits immediately to the south in Lacorne Town ship have received a great deal of attention and .have been discussed.in anumber of reports including Papers 53-3 and - 53-4 issued in 1953 and 1954 by the Geological Survey of Canada and respectively entitleds "Pegmatitic Beryllium and - Lithium Deposits',:Preissac- Lacorne.Regidn, Abitibi Count, Quebec", by Robert B. Rowe "Structural Features of the Preissac-Lacorne:Batholith, Abitibi: County,. Quebec",'by K. R. Dawson. At the last Prospectors: and Developers'Convention held in Toronto in March 1955, a paper:on the "Lithium Deposits of the Lacorne Area" was presented by the resident geologists of the .Quebee Department' of Mines, who have also prepared a half-a-mile-to-the-inch map incorporating the' latest geological data available on the area. The results of an eeromagnetic•survey conducted in, l9+8' by the Geophysics Section of the Geological Survey of Canada were released in 1952 and are presented-on map 72G entitled.."Barraute"; it shows an anomaly of relatively low intensity extending in an approximately east-west direction a short distance to the north of the boundary between Ranges 1 and II. ' Except for a fete .very limited rock exposures in the northwest corner,, the-above-mentioned maps show nô .outcrops whatsoever, within the .limits of the area surveyed and the .general geological conditions must, therefore, be projected from adjoining.,properties. The underlying rocks would consist chiefly of andesitic keewatin lavas intruded in the northwest cerner by a northeast-trending diabase dyke. According to the latest determination, the important Manneville fault, believed to -represent. the. eastern extension of.the well-known-porcupine-Beattie break, would pass, about half a mile south of the. New. Laguerre claims. A plug of. quartz feldspar porphyry, elongated in an east-west direction and containing numerous sulphide' occurrences, terminates about half a mile west of the New Laguerre ,property and, on the east side-, . the Mogador mine, about 8 miles. away,- lies roughly on the same geological. horizon.. The claims must therefore be regarded as favorable hunting ground for base-metals. Opinions, however, are divided as regards the possibility., of finding lithium deposits north of the Manneville break; it is claimed by some geologists that considerable` verical movement has.taken, place along the'. fault and , that geological formations on either side of it are totally unrelated, so that a - granite mass of the Lacorne type. on ,the - New- Laguerre property would net necessarily be a. satellite af the main batholith near the contact of which the spodumene ore-bodies are concentrated., On the other. hands it is generally believed that most of the important litheum-bearing.pegmatte,dykes so,far discovered in the area probably occupy tension openings related to the Manne- ville fault. Until, proof to- the contrary,: it cannot be definitely stated that `no lithium deposit is to be found on the north side of.the Manneville faultt which may have been the controlling structure, and `any favorable forma- tion in ita.vicinity would: appear to warrant careful investigation.

RESULTS . OF TIE SUI1VEY

All the results of the survey are compiled on the accompanying map drawn at a scale of 200 feet to the inch; the figures plotted near each measurement station represent the magnetic values which are expressed in gammas and are also represented graphically by profiles drawn at a scale of 1000 gammas to the inch. Our interpretation of the geological significance of the magnetic results is presented in the following para- graphs; technical details regarding the methods used, in the performance of the magnetometer measurements and in the establishment of the picket lines will be found in the Appendix.

• The. survey, was instrumental in outlining two distinct belts of magnetic rock separating three zones of relatively uniform . magnetic values marked A, B and C : on the map. Five holes drilled by New Laguerre in the south- western section of zone A just before our survey was completed encountered mostly andesite with one band of grey- wacke, a few occurrences of graphite and narrow intersec- tions of massive pyrite and pyrrhotite. No geological information whatsoever is available as to the nature of the rock underlying the rest of zone A as well as zones B and C, but very minor magnetic variations such as shown by lines marked MM and NN. on the accompanying map would seem to indicate that they are probably underlain chiefly 'by volcanic rather than by intrusive rocks. The presence, however, of some intrusive masses of a non-magnetic type cannot be altogether ruled out, especially in zone B where such a possibility is faintly suggested by the very slight divergence in strike on either side, by the uniformity of the magnetic values and by the fact that the zone may be closed on the east side by anomaly S. In the northwest corner of. zone C, two northeast- trending anomalies marked D1 and D2 are undoubtedly due to diabase dykes. Anomalies Vi, V2 and V3 are of the greenstone type and probably represent simply a weakly magnetic horizon in the volcanic formations; a sudden increase in width in the vicinity of line 0 could be due to transverse faulting. The M anomalies (MI to M6) are also of the general greenstone type, but the irregularity of the magnetic values, which range up to nearly 4000 gammas, and the fact that they lie roughly along the eastern, extension of known mineralized zones suggest that they may be due at least in part to miner- alization; the variation in width and intensity is much more pronounce than in the case of the V anomalies and may be due to the lenticular nature of the magnetic formations or possibly to transverse 'faulting; we have marked on the accom- parrying map by the letters FF.to F4F4 a humber of possible transverse faults; FIFi and F F2.may represent the same fracture and similarly F3F3 lines up roughly with F1,1..t

SUMMARY AND RECOMMENDATIONS

The magnetometer survey supplied a general pic- ture of the geological conditions on the New Laguerre property and, in addition to diabase dykes in the northwest corner, indicated two magnetic belts separating three zones of relatively uniform values where intrusive rocks may be present; one of the magnetic horizons is on strike of formations known to contain sulphide occurrences and some of the individual anomalies could be due to mineral- ization. It is recommended that particular attention be paid to the M anomalies especially near the possible transverse faults suggested by the magnetic results. After hole No. 6 now being drilled to explore the eastern part of anomaly m5, another boring could be made toward the south from station N-15 on line 3W to investigate anomaly 114 near possible fault F1F1. The nature of the rocks responsible for the V anomalies should be determined by at least one hole, which could be collared at station S-4 on line 0 and directed toward the south so as to intersect anomaly V2 near assumed fault F4F4. The possibility that zone B may be underlain by intrusive rock should be checked by one short diamond-drill hole drilled in its approximate center, for instance at station N-7 on line 3E; if a granitic mass is thus indicated, it may contain lithium deposits and should be completely cross-sectioned by.a series of holes. .APPENDIX

TECHNICAL DETAILS OF THE SURVEY

The field work started on June 8th, 1955 and was completed on July 25th; the preparation.of the map and, report lasted. until July 30th.

Network of Picket Lines . The network of measurement stations consists of numbered pickets placed at 100-foot intervals on lines. started 300 feet apart at approximately 90o to .a main base line coinciding with the boundary between Ranges,II and 'III. The distances between the-ends of the lines were .then chained along, the. Landrienne-Lacorne township line , on the south and the boundary between Ranges II and..III 'on the north; measurements were taken to several lot posts, so. that the whole network is accurately tied in to the official township survey. The total length of the lines` cut and chained .amounted to.28.35 miles and all chainages except the regu- lar. 100- and'300-foot intervals are.plotted..on.the'accompanying map.

Magnetometer Survey The magnetometer stations established and the measurements performed can be classified as follows: Base Station 1 . Stations` of the . main network 1390 Stations on intermediate lines 13 Total number ,of stations . 1404 Check. measurements on bases 34'.'.. Check measurements on ordinary stations 15 Total number of measurements performed 1453 The survey *as carried ©.ut with a Ruska magnetometer measuring the variations :of the vertical component of the earth's;magnetic field. The instrument was adjusted for precision work with a scale constant of 20.8 `.gammas. per division and a completely annulled temperature coeffi- cient.. .In o'rder to reduce to a minimum the inevitable 'errors due to -'daily .magnetic variations, ;checks. Were taken on a base.at least every' three' hours and: the daily varia- tionse ,observedvwere distributed proportionally to time. between the stations occupied during the day. All ,the magnetic values shown on the attached map are expressed.in gammas (1 gamma ,= 1/100,000 gauss C.G.S. unit) and are referred to an arbitrarily chosen magnetic,base considered to have a zero value and located in the very,, centre of the property at , the intersection of the base line with line 0 (station LeO/;0) The total value of. the vertical= component of the earth's magnetic field in the district is of,about .57,800gemmas

Thé interpretation of the results iras based on: the study.: of magnetic 'profiles, drawn at a scale of 1000 gàmmas to the inch.