Magnetometer and VLF EM Surveys Over the

Transcription

1 PO Box 9, 4579 Government Road, Larder Lake, Ontario, PK L, Canada Phone (75) 645 Fax (75) Magnetometer and VLF EM Surveys Over the ANVIL PROPERTY Van Nostrand Township, Ontario

2 TABLE OF CONTENTS. SURVEY DETAILS.... PROJECT NAME.... CLIENT.... LOCATION....4 ACCESS SURVEY GRID SURVEY WORK UNDERTAKEN SURVEY LOG PERSONNEL SURVEY SPECIFICATIONS OVERVIEW OF SURVEY RESULTS SUMMARY INTERPRETATION... 6 LIST OF APPENDICES APPENDIX A: STATEMENT OF QUALIFICATIONS APPENDIX B: THEORETICAL BASIS AND SURVEY PROCEDURES APPENDIX C: INSTRUMENT SPECIFICATIONS APPENDIX D: LIST OF MAPS (IN MAP POCKET) LIST OF TABLES AND FIGURES Figure : Location of... Figure : Claim Map with Anvil Traverses... 4 Figure : Total Field Magnetic Plan map over... 6 Table : Survey Log... 5 CANADIAN EXPLORATION SERVICES LIMITED PLAN-EXECUTE-DISCOVER-DEVELOP Page ii

3 . SURVEY DETAILS. PROJECT NAME This project is known as the.. CLIENT AURORA SILVER MINES LIMITED 4579 Government Rd. Larder Lake, Ontario PKL. LOCATION The is located approximately km south of Elk Lake, Ontario. The magnetic traverse area is located in Van Nostrand Township and covers mining claim 47, within the Larder Lake Mining Division. Figure : Location of CANADIAN EXPLORATION SERVICES LIMITED PLAN-EXECUTE-DISCOVER-DEVELOP Page

4 Figure : Claim Map with Anvil Traverses.4 ACCESS Access to the property was attained with a 4x4 truck via the Town of Elk Lake, Ontario. From Elk Lake, the Cooke Lake Road extends southward. The Cooke Lake Road along with a secondary Anvil Lake access trail was travelled for approximately 4 kilometers to access the survey area. For this, a snow machine was originally used, then Argo and ATV..5 SURVEY GRID The traversed lines were established using a GPS in conjunction with the execution of the survey. The GPS operator would establish sample locations while remaining approximately.5m in front of the magnetometer operator. GPS waypoints, magnetic and VLF samples were taken every.5m along these controlled traverses. The GPS used was a Garmin GPS Map 6S. CANADIAN EXPLORATION SERVICES LIMITED PLAN-EXECUTE-DISCOVER-DEVELOP Page 4

5 . SURVEY WORK UNDERTAKEN. SURVEY LOG Date Description Line Min Extent Max Extent Total Survey (m) February 8, Crew breaks skidoo trail to Anvil survey area with skidoo. Due to the length of skidoo trip (8+km) it is decided a second crew is needed for safety reasons. March 5, March 6, March 7, After early thaw, crew attempts to survey area with ATV s and found that the access trail was too flooded and an Argo was needed. Achieve access using Argo. Begin survey. Argo failure during long trip out. 4W 4S 4 W 5S 5 W 6.S 6.5 W 4S 4 Return with second Argo to recover the first Argo. Abandon survey until better access can be achieved. Table : Survey Log. PERSONNEL Chris Prest of Kirkland Lake, Ontario conducted the magnetic data collection while Tyler Potts of Larder Lake, Ontario was responsible for the GPS control and GPS waypoint collection.. SURVEY SPECIFICATIONS The survey was conducted with a GSM-9 v7 Overhauser magnetometer/vlf with a second GSM-9 magnetometer for a base station mode for diurnal correction. A total of.95 line kilometers of no grid mag and VLF EM was performed between February 8 th and March 7 th,. This consisted of 7 magnetometer and VLF EM samples taken at.5m intervals. CANADIAN EXPLORATION SERVICES LIMITED PLAN-EXECUTE-DISCOVER-DEVELOP Page 5

6 . OVERVIEW OF SURVEY RESULTS. SUMMARY INTERPRETATION Figure : Total Field Magnetic Plan map over Access proved extremely difficult for this property. After spending a day opening a 4 plus kilometer skidoo trail to the survey area, it was determined that for safety reasons work had to be delayed until an additional magnetometer crew became available. When the crew became available, the snow conditions had changed drastically because of the extremely early breakup. This resulted in the requirements of an Argo for entry. The survey was abandoned because of the extremely long Argo rides required to access the survey area and the end result was one survey day for 4 days worth of attempts. The survey indicates the presence of a magnetic high in the north part of the survey area. This area is covered with Nipissing Diabase and this contrast between the magnetic highs and lows most likely represent the top and bottom of the sill. CANADIAN EXPLORATION SERVICES LIMITED PLAN-EXECUTE-DISCOVER-DEVELOP Page 6

7 APPENDIX A STATEMENT OF QUALIFICATIONS I, C. Jason Ploeger, hereby declare that:. I am a geophysicist (non-professional) with residence in Larder Lake, Ontario and am presently employed as Geophysical Manager of Canadian Exploration Services Ltd. of Larder Lake, Ontario.. I graduated with a Bachelor of Science degree in geophysics from the University of Western Ontario, in London Ontario, in I have practiced my profession continuously since graduation in Africa, Bulgaria, Canada, Mexico and Mongolia. 4. I am a member of the Ontario Prospectors Association, a Director of the Northern Prospectors Association and a member of the Society of Exploration Geophysicists. 5. I do not have nor expect an interest in the properties and securities of Aurora Silver Mines Limited. 6. I am responsible for the final processing and validation of the survey results and the compilation of the presentation of this report. The statements made in this report represent my professional opinion based on my consideration of the information available to me at the time of writing this report. Larder Lake, ON May C. Jason Ploeger, B.Sc. (geophysics) Geophysical Manager Canadian Exploration Services Ltd. CANADIAN EXPLORATION SERVICES LIMITED PLAN-EXECUTE-DISCOVER-DEVELOP

8 APPENDIX B THEORETICAL BASIS AND SURVEY PROCEDURES TOTAL FIELD MAGNETIC SURVEY Base station corrected Total Field Magnetic surveying is conducted using at least two synchronized magnetometers of identical type. One magnetometer unit is set in a fixed position in a region of stable geomagnetic gradient, and away from possible cultural effects (i.e. moving vehicles) to monitor and correct for daily diurnal drift. This magnetometer, given the term base station, stores the time, date and total field measurement at fixed time intervals over the survey day. The second, remote mobile unit stores the coordinates, time, date, and the total field measurements simultaneously. The procedure consists of taking total magnetic measurements of the Earth s field at stations, along individual profiles, including Tie and Base lines. A meter staff is used to mount the sensor, in order to optimally minimize localized near-surface geologic noise. At the end of a survey day, the mobile and base-station units are linked, via RS- ports, for diurnal drift and other magnetic activity (ionospheric and sferic) corrections using internal software. For the gradiometer application, two identical sensors are mounted vertically at the ends of a rigid fiberglass tube. The centers of the coils are spaced a fixed distance apart (.5 to.m). The two coils are then read simultaneously, which alleviates the need to correct the gradient readings for diurnal variations, to measure the gradient of the total magnetic field. VLF Electromagnetic The frequency domain VLF electromagnetic survey is designed to measure both the vertical and horizontal inphase (IP) and Quadrature (OP) components of the anomalous field from electrically conductive zones. The sources for VLF EM surveys are several powerful radio transmitters located around the world which generate EM radiation in the low frequency band of 5-5kHZ. The signals created by these long-range communications and navigational systems may be used for surveying up to several thousand kilometres away from the transmitter. The quality of the incoming VLF signal can be monitored using the field strength. A field strength above 5pT will produce excellent quality results. Anything lower indicates a weak signal strength, and possibly lower data quality. A very low signal strength (<pt) may indicate the radio station is down. The EM field is planar and horizontal at large distances from the EM source. The two components, electric (E) and magnetic (H), created by the source field are orthogonal to each other. E lies in a vertical plane while H lies at right angles to the direction of propagation in a horizontal plane. In order to ensure good coupling, the strike of possible conductors should lie in the direction of the transmitter to allow the H vector to pass through the anomaly, in turn, creating a secondary EM field. The VLF EM receiver has two orthogonal aerials which are tuned to the frequency of the transmitting station. The direction of the source station is located by rotating the sensor around a vertical axis until a null position is found. The VLF EM survey procedure consists of taking measurements at stations along each line on the grid. The receiver is rotated about a horizontal axis, right angles to the traverse and the tilt recorded at the null position. CANADIAN EXPLORATION SERVICES LIMITED PLAN-EXECUTE-DISCOVER-DEVELOP

9 APPENDIX C GSM 9 Specifications Overhauser Performance Resolution:. nt Relative Sensitivity:. nt Absolute Accuracy:.nT Range:, to, nt Gradient Tolerance: Over,nT/m Operating Temperature: C to +6 C Operation Modes Manual: Coordinates, time, date and reading stored automatically at min. second interval. Base Station: Time, date and reading stored at to 6 second intervals. Walking Mag: Time, date and reading stored at coordinates of fiducial. Remote Control: Optional remote control using RS- interface. Input/Output: RS- or analog (optional) output using 6-pin weatherproof connector. Operating Parameters Power Consumption: Only Ws per reading. Operates continuously for 45 hours on standby. Power Source: V.6Ah sealed lead acid battery standard, other batteries available Operating Temperature: -5 C to +6 C Storage Capacity Manual Operation: 9, readings standard, with up to 6, optional. With VLF stations:, standard and up to 48, optional. Base Station: 5, readings standard, with up to 49, optional (88 hours or 4 days uninterrupted operation with sec. intervals) Gradiometer: 5, readings standard, with up to, optional. With VLF stations:,, with up to 45, optional. Omnidirectional VLF Performance Parameters: Resolution.5% and range to ±% of total field. Frequency 5 to khz. Measured Parameters: Vertical in-phase & out-of-phase, horizontal components, total field coordinates, date, and time. Features: Up to stations measured automatically, in-field data review, displays station field strength continuously, and tilt correction for up to ± tilts. Dimensions and Weights: 9 x 4 x 5mm and weighs only.kg. Dimensions and Weights Dimensions: Console: x 69 x 4mm Sensor: 7 x 7mm diameter cylinder Weight: CANADIAN EXPLORATION SERVICES LIMITED PLAN-EXECUTE-DISCOVER-DEVELOP

10 Console:.kg Sensor and Staff Assembly:.kg Standard Components GSM-9 magnetometer console, harness, battery charger, shipping case, sensor with cable, staff, instruction manual, data transfer cable and software. Taking Advantage of a Quirk of Physics Overhauser effect magnetometers are essentially proton precession devices except that they produce an orderof magnitude greater sensitivity. These "supercharged" quantum magnetometers also deliver high absolute accuracy, rapid cycling (up to 5 readings / second), and exceptionally low power consumption. The Overhauser effect occurs when a special liquid (with unpaired electrons) is combined with hydrogen atoms and then exposed to secondary polarization from a radio frequency (RF) magnetic field. The unpaired electrons transfer their stronger polarization to hydrogen atoms, thereby generating a strong precession signal-- that is ideal for very high-sensitivity total field measurement. In comparison with proton precession methods, RF signal generation also keeps power consumption to an absolute minimum and reduces noise (i.e. generating RF frequencies are well out of the bandwidth of the precession signal). In addition, polarization and signal measurement can occur simultaneously - which enables faster, sequential measurements. This, in turn, facilitates advanced statistical averaging over the sampling period and/or increased cycling rates (i.e. sampling speeds). The unique Overhauser unit blends physics, data quality, operational efficiency, system design and options into an instrumentation package that... exceeds proton precession and matches costlier optically pumped cesium capabilities CANADIAN EXPLORATION SERVICES LIMITED PLAN-EXECUTE-DISCOVER-DEVELOP

11 APPENDIX C GARMIN GPS MAP 6S Physical & Performance: Unit dimensions, WxHxD: Display size, WxH: Display resolution, WxH: Display type: Weight: Battery: Battery life: Waterproof: Floats: High-sensitivity receiver: Interface:.4" x 6." x.4" (6. x 6. x.6 cm).4" x.5" (.6 x 5.5 cm);.6" diag (6.6 cm) 6 x 4 pixels transflective, 65-K color TFT 9. oz (6. g) with batteries AA batteries (not included); NiMH or Lithium recommended hours (IPX7) no high-speed USB and NMEA 8 compatible Maps & Memory: Basemap: Preloaded maps: Ability to add maps: Built-in memory: no.7 GB CANADIAN EXPLORATION SERVICES LIMITED PLAN-EXECUTE-DISCOVER-DEVELOP

12 Accepts data cards: microsd card (not included) Waypoints/favorites/locations: Routes: Track log:, points, saved tracks Features & Benefits: Automatic routing (turn by turn routing on roads): Electronic compass: Touchscreen: Barometric altimeter: Camera: Geocaching-friendly: Custom maps compatible: Photo navigation (navigate to geotagged photos): Outdoor GPS games: Hunt/fish calendar: Sun and moon information: Tide tables: Area calculation: Custom POIs (ability to add additional points of interest): Unit-to-unit transfer (shares data wirelessly with similar units): Picture viewer: Garmin Connect compatible (online community where you analyze, categorize and share data): (with optional mapping for detailed roads) (tilt-compensated, -axis) no no (paperless) no Specifications obtained from CANADIAN EXPLORATION SERVICES LIMITED PLAN-EXECUTE-DISCOVER-DEVELOP

13 APPENDIX D LIST OF MAPS (IN MAP POCKET) Posted profiled TFM plan map (:5) ) AURORA SILVER-ANVIL-MAG-CONT Posted profiled VLF EM plan map (:5) ) AURORA SILVER-ANVIL-VLF-NML Grid Sketch on Claim Map (:) ) AURORA SILVER -ANVIL-GRID TOTAL MAPS= CANADIAN EXPLORATION SERVICES LIMITED PLAN-EXECUTE-DISCOVER-DEVELOP

14 L4W L4W LW L5W L5W L5W

15 Scale :5 ANVIL PROPERTY VLF IN PHASE/OUT PHASE PROFILE PLAN MAP 5.kHz NML - LAMOUR USA In Phase: Posted Right/Bottom (Red) Out Phase: Posted Left/Top (Blue) Vertical Profile Scales: %/mm Contour Interval:, 5,, 5,, 5, 5, Station Seperation:.5 meters Posting Level: GSM-9 OVERHAUSER MAGNETOMETER/VLF v7 Receiver Operated By: Chris Prest GPS Operated By: Tyler Potts Processed by: Claudia Moraga Map Drawn By: C Jason Ploeger, B.Sc. May Drawing :AURORA SILVER-ANVIL-VLF-NML L4W L4W L5W L5W LW LW L5W L5W (meters) NAD8 / UTM zone 7N

16 Scale : TOTAL FIELD MAGNETIC nanotesla (nt) ANVIL PROPERTY TOTAL FIELD MAGNETIC CONTOURED PLAN MAP Base Station Corrected Posting Level: nt Field Inclination/Declination: 74degN/degW Station Seperation:.5 meters Total Field Magnetic Contours: nt GSM-9 OVERHAUSER MAGNETOMETER/VLF v7 Receiver Operated By: Chris Prest GPS Operated By: Tyler Potts Processed by: Claudia Moraga Map Drawn By: C Jason Ploeger, B.Sc. May Drawing :AURORA SILVER-ANVIL-MAG-CONT L4W L4W L5W L5W LW LW L5W L5W (meters) NAD8 / UTM zone 7N