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Geophysical Overview of the Aerodat Airborne

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Geophysical Overview of the Aerodat Airborne GM 46677 GEOPHYSICAL OVERVIEW OF THE AERODAT AIRBORNE GEOPHYSICAL SURVEY ON THE MCIVOR LAKE PROPERTY 'MMietin de Meryl" it des BeuQnrap 110 Service de Is Oéolnformatlon Ode i5 JINN 1988 No GAL 4.6677 L GEOPHYSICAL OVERVIEW OF THE AERODAT AIRBORNE GEOPHYSICAL SURVEY ON THE MACIVOR LAKE PROPERTY FOR SHEAR EXPLORATION LIMITED R.J. Meikle Exsics Exploration Ltd April 22, 1988 TABLE OF CONTENTS Page INTRODUCTION 1 AIRBORNE SURVEY 1 SUMMARY AND RECOMMENDATIONS 3 LIST OF MAPS Map #1 Interpretation Map #2 Calculated Vertical Magnetic Gradient Map #3 VLF-EM Total Field Contours Map #4 Total Field Magnetic Contours Map #5 Calculated Vertical Magnetic Gradient Contours. & Colours APPENDICES Appendix A Geophysical Report on Caber Project Aerodat survey INTRODUCTION The writer has been contracted to review and assess a recent airborne Mag, VLF and HEM Survey flown by Aerodat over a 165 claim group lotted in Daniel Township, Quebec. Claim status, location etc., has been dealt with in a report by R.E. Norman, Feb 10, 1988. This brief report deals specifically with the results of the airborne survey and the correlation with the limited amount of previous work done on the property. Technical specifications for the airborne survey are included. They are taken from a report on a larger survey of which the Maclvor Lake Property comprises a part of the eastern block. AIRBORNE SURVEY The airborne results show several interesting features. The most noteable is a NE trending diabase dike which is well defined on the Total Field magnetometer map as well as the vertical gradient map. From the government map M306 it is evident that there are numerous copper and zinc showings on or in close proximity to the dike, northeast of the property. the structural significance of this intrusive is not known at this time. - 1 - However, there is an offset in the centre of Maclvor Lake. This offset would support the possibility of a NW structural fault which would correlate with: 1. A pronounced NW straight NE shoreline of Macivor Lake. 2. A NW flexture in the western tributary of the Allard River and a NW trending bay to the SE on the main river course. 3. There is a coincident NW trending resistivity low shown on the Aerodat calculated apparent resistivity contoured map. 4. Fourth, but probably the most important; this proposed structure is parallel to and west of a major NW fault shown on government maps. This feature forms the south- western flank of a felsic unit to the SW on which there are several mines in close proximity to this felsic/mafic volcanic contact, the Matagami Mine being one of the larger ones. This NW structure continues to the NW through the Allard River, Wabassi Lake and the Gouault River. The current Aerodat survey covers a portion of this structure and shows a coincident NW trending resistivity low. Only the Calculated Vertical Magnetic Gradient Map is available to the author. This map does not show any clear evidence to support the NW fault. - 2 - There are several airborne EM anomalies mainly clustered around the east and SE shore of Maclvor Lake. From the compilation files it appears that there is a felsic unit between Maclvor Lake and Wabassi Lake. This felsic unit was encountered in two drill holes. It should be stressed that this work was carried out in the late 1950's and early 1960's. The geophysical work appears to have consisted of Vertical Loop Surveys. Also, the thrust of their early exploration programs was base metal orientated. It appears that favourable gold-bearing geology was not recognized and gold assays were not commonly run. Other than the aforementioned structural features, the Airborne Survey suggest that the geology consists of interbedded volcanics striking EW to northeasterly. This being the case, the stratigraphy which hosts the New Hosco Mine, 4 km to the east would continue on to the property. SUMMARY AND RECOMMENDATIONS The property is well situated geologically and has a very limited smount of work done on it. The NW structures described appear to be economically important on a regional scale. The NW structure in the vicinity of the Matagami Lake Mine cari be extrapolated northwestward through Daniel Twp., La Gauc:hetiere Twp., Grasset Twp., Subercase Twp., and Caumont Twp., using surface topographical expressions. Also, there are numerous gold showing along this structure in each township. - 3 A favourable place to concentrate exploration efforts would be the intersection of this NW structure with other structures such as the diabase dike on Macivor Lake. The following recommendations are based on a compilation of the available Aerodat Maps, Government Maps and Compilation Maps. 1. A grid should be cut to cover the entire property. The baseline should be orientated at 090 degrees TN with cross lines at an azimuth of 180 degrees TN at a spacing of 100 meters. This would seem to be the optimum direction to couple with the different structures described in this report. 2. A detailed magnetometer survey should be carried out on the entire grid at a 12.5 meter spacing utilizing a recording base station. 3. A two station VLF-EM survey should be conducted on the entire grid utilizing Cutler Maine and Anapolis Maryland. 4. The entire grid should be mapped in detail. 5. A "Gradient Array" IP survey should be carried out to cou»»+ the more interesting geological areas of the grid and any important anomalies located by the Mag/VLF survey. Yours truly, R.J. Meikle Exsics Exploration Ltd - 4 APPENDIX A. The following data is taken from a report entitled "Geophysical Report on Caber Project Aerodat Survey" by R.J. de Carle, Nov 25, 1987. The full report is not available because it covers both the Shear Exploration property as well as Newmont Exploration of Canada Ltd's property. 2 - 1 2. SURVEY AREA LOCATION The survey area is depicted on the index map as shown. It is centred at Latitude 49 degrees 47 minutes north, Longitude 78 degrees 00 minutes west, approximately 27 kilometres west-northwest of Matagami, Quebec, (NTS Reference Map No. 32E/16 and 32F/13) . The eastern portion of the survey block is in the confines of Lac Macivor while the western portion is in the proximity of Riviere Subercase. The area is accessible by helicopter or float plane from the Town of Matagami. The terrain is generally flat, with elevations in the order of 850 feet above sea level. Two large hills, located to the southwest of Lac Macivor, are approximately 1150 feet high. 78°00' Lac La Coucheliiri Lae t41PPP, ~au Rat ouauil ra446 Lac Lac < y 5 Alacivor ô Warm ~!^ ~_~_...~~~.. 4 49°45' ► ~ d +~, r ~i ~ h , \ç.0 —19 ti~ l 3 - 1 3. AIRCRAFT AND EQUIPMENT 3.1 Aircraft An Aerospatiale A-Star 350D helicopter, (C-GJIX), owned and operated by Ranger Helicopters Limited, was used for the survey. Installation of the geophysical and ancillary equipment was carried out by Aerodat. The survey aircraft was flown at a mean terrain clearance of 60 metres. 3.2 Equipment 3.2.1 Electromagnetic System The electromagnetic system was an Aerodat 3-frequency system. Two vertical coaxial coil pairs were operated at 935 Hz and 4600 Hz and a horizontal coplanar coil pair at 4175 Hz. The transmitter-receiver separation was 7 metres. Inphase and quadrature signals were measured simultaneously for the 3 frequencies with a time constant of 0.1 seconds. The electromagnetic bird was towed 30 metres below the helicopter. 3.2.2 VLF-EM System The transmitters monitored were NLK, Jim Creek, Washington, broadcasting at 24.8 KHz for the Line Station and NAA, Cutler, Maine, broadcasting at 24.0 kHz for the Orthogonal station. 3 - 2 3.2.3 Magnetometer The magnetometer employed a Scintrex Model VIW-2321 H8 cesium, optically pumped magnetometer sensor. The sensitivity of this instrument was 0.1 nanoTeslas at a 0.2 second sampling rate. The sensor was towed in a bird 12 metres below the helicopter. 3.2.4 Magnetic Base Station An IFG- 2 proton precession magnetometer was operated at the base of operations to record diurnal variations of the earth's magnetic field. The clock of the base station was synchronized with that of the airborne system to facilitate later correlation. 3.2.5 Radar Altimeter A King Air radar altimeter was used to record terrain clearance. The output from the instrument is a linear function of altitude for maximum accuracy. 3.2.6 Tracking Camera A Sony video tracking camera was used to record flight path on VHS video tape. The camera was opèrated in continuous mode. Fiducial numbers and time reference marks, for cross reference to the analog and digital data, were encoded on the tape. 3.2.7 Analog Recorder An RMS dot-matrix recorder was used to display the data during the survey. In addition to manual and time fiducials, the following data were recorded: Channel Input Scale CX11 Low Frequency Inphase 2.0 ppm/mm CXQ1 Low Frequency Quadrature 2.0 ppm/mm CX12 High Frequency Inphase 2.0 ppm/mm CXQ2 High Frequency Quadrature 2.0 ppm/mm CPI1 Mid Frequency Inphase 8.0 ppm/mm CPQ1 Mid Frequency Quadrature 13.0 ppm/mm VLT VLF-EM Total Field, Line 2.5%/mm VLQ VLF-EM Quadrature, Line 2.5%/mm VOT VLF-EM Total Field, Ortho 2.5%/mm VOQ VLF-EM Quadrature, Ortho 2.5%/mm ALT Altimeter 10 ft/mm MAGF Magnetometer, fine' 2.5 nT/mm MAGC Magnetometer, coarse 25 nT/mm MAGN Magnetometer, noise 0.025 nT/mm 3 - 4 3.2.8 Digital Recorder A DGR 33 data system recorded the survey on magnetic tape.
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