report on borehole induced polarization surveys herrick

Report on

Borehole Induced Polarization Surveys

Herrick Grid, Shining Tree Project

Churchill Township

Northern Ontario

PLATINEX INC.

Ref. 10-73 December, 2010

Report on

Borehole Induced Polarization Surveys

Herrick Grid, Shining Tree Project

Churchill Township, Northern Ontario

For: Platinex Inc. 114 – 445 Applecreek Blvd. Markham, ON L3R 9X7 Tel: 905-470-6400 Fax: 905-470-6450 Contact: James Trusler (President & CEO) E-mail: [email protected]

By: JVX Ltd. 60 West Wilmot Street, Unit #22 Richmond Hill, ON L4B 1M6 Tel: 905-731-0972 Fax: 905-731-9312 Contact: Blaine Webster E-mail: [email protected]

Ref. 10-73 December, 2010

Summary Borehole Directional Induced Polarization and Resistivity surveys were done on the Herrick grid, Shining Tree Project, Northern Ontario. The work was done for Platinex Inc. by JVX Ltd. under JVX job number 10-73. The field work was done in the period from September 29 to October 3, 2010. A total of six holes were surveyed. This report discusses the logistics of the project and offers an interpretation of the data.

Table of Contents

1 INTRODUCTION 1

2 BACKGROUND 2

3 INTERPRETATION OF BHIP PROFILES 3

3.1 GRADIENT (DIRECTIONAL LOG) 3 3.1.1 Hole HP09-33 3 3.1.2 Hole HP10-43 3 3.1.3 Hole HP10-44 3 3.1.4 Hole HP10-45 4 3.1.5 Hole HU89-6 4 3.1.6 Hole HU89-9 4

4 INVERSION MODEL RESULTS 4

5 SUMMARY AND RECOMMENDATIONS 9

LIST OF FIGURES Figure 1: Regional Location Map Figure 2: Surveyed Grid & Bore Hole Locations Figure 3: Borehole Electrode Geometry (see Appendix B) Figure 4: 3D chargeability model showing possible target zone Figure 5: 2D chargeability and resistivity model of Line 1300N Figure 6: 2D chargeability and resistivity model of Line 1400N

LIST OF PLATES The plates are included in Appendix C of this report. Borehole Directional Induced Polarization and Resistivity data are presented as profile charts in Appendix C. Each hole listed below has a chart for apparent resistivity Rho and Mx chargeability. HP09-33: Gradient Array (Rho, Mx), Scale 1:1000 HP10-43: Gradient Array (Rho, Mx), Scale 1: 1000 HP10-44: Gradient Array (Rho, Mx), Scale 1: 1000 HP10-45: Gradient Array (Rho, Mx), Scale 1: 1000 HU89-6: Gradient Array (Rho, Mx), Scale 1: 1000 HU89-9: Gradient Array (Rho, Mx), Scale 1: 1000 3D Models of the Gradient Array: The models produced from the Gradient IP/Resistivity surveys are presented as figures in section 4 of this report. Models of conductivity and chargeability were computed from the borehole gradient data that was collected in holes HP09-33, HP10-43, HP10-44, HP10-45, HU89-6 and HU89-9. The models are provided as Oasis Montaj project files. The models can be zoomed, rotated and sliced as desired using the free Oasis Montaj Geosoft Viewer (www.Geosoft.com).

LIST OF APPENDICES Appendix A: Instrument Specification Sheets Appendix B: Surveys, Personnel, Data Processing and Production Appendix C: BHIP Directional Log Profiles Appendix D: Introduction to BHIP Basic Models Appendix E: 3D Models in Geosoft Project File

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1 INTRODUCTION Borehole Induced Polarization/Resistivity (BHIP) surveys were done on the

Herrick grid, Shining Tree Project, Shining Tree area in Northern Ontario. The work was done for Platinex Inc. by JVX Ltd. under JVX job number 10-73. The field work was done in the period from September 29 to October 3, 2010. The BHIP surveys were conducted on six boreholes: HP09-33, HP10-43, HP10-44, HP10-45, HU89-6 and HU89-9. The work was done on claim 1242019.

The regional setting of the survey area is shown in Figure 1. The borehole

locations and local setting of the grid are shown in Figure 2 (folded and bound with this report). A detailed production summary for the survey is included in Appendix B.

The profiles of the directional logs are found in Appendix C of this report.

The conductivity and chargeability models produced from the Gradient IP/Resistivity surveys are presented as figures in section 4 and provided as Oasis Montaj project files in Appendix E. The models can be zoomed, rotated and sliced as desired using the free Oasis Montaj Geosoft Viewer which can be downloaded from www.Geosoft.com. Instrument specification sheets are attached in Appendix A. All of the plates and raw data are archived on the CD accompanying this report.

Surveyed by JVX LTD December 2010 Ref. no. 10-73

REGIONAL LOCATION MAP PLATINEX INC.

HERRICK GRID, SHINING TREE PROJECT CHURCHILL TWP., ONTARIO

NTS: 41 P/11 BOREHOLE IP / RESISTIVITY SURVEYS

FIGURE 1

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2 BACKGROUND Reading from Bryant and Jamieson, 2008 –

The Herrick vein received relatively systematic early exploration from the time of discovery in 1918 until 1923 when the underground development program ceased. The project was dormant until 1989, except for undocumented surface sampling in 1940. The 1989 Unocal exploration program in the Herrick and Churchill areas, was a well documented and systematic exploration program that provided an excellent framework to compile early exploration results and develop future exploration programs.

The Herrick vein structure appears to be an extensive gold-mineralized system. Although the results of Unocal’s work did not meet their threshold for continued expenditures, further work is needed to determine the extent of the local higher grade gold mineralization indicated, as well as the extent of wider zones of lower grade gold mineralization intersected by Unocal. The authors believe that the Herrick gold deposit is a high priority exploration target that may be up-graded to a gold resource with additional drilling.

Phase I investigations should be primarily directed at drill testing the Herrick deposit during the fall of 2008. A total of 1,500 metres in 10 to 15 holes is recommended. The drilling should assess the continuity and grades of gold mineralization and develop the knowledge base to plan more detailed and deeper delineation of the deposit in Phase II. Preliminary calculations of the resource may be possible after the Phase I program is completed. Preliminary work will include re-establishment of the Unocal grid and an initial induced polarization (IP) survey to determine if the technique will assist in target definition in the Herrick deposit area and elsewhere.

Judging from evidence of previous results on the Herrick deposit there is a potential to outline a small commercial gold deposit. On a larger scale the bulk of the property may be at the low temperature top of an epithermal system that could well be associated with a world-class gold deposit at depth.

Reference

J.G. Bryant and David Jamieson, 2008, Technical Report for Platinex Inc., Shining Tree Gold Project, Shining Tree, Ontario

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3 INTERPRETATION OF BHIP PROFILES The results of the BHIP survey are described on a hole-by-hole basis in this section.

3.1 GRADIENT (DIRECTIONAL LOG)

3.1.1 Hole HP09-33

The apparent resistivity profile shows a conductor centered at a downhole depth of approximately 112.5 m. This conductive zone is associated with high chargeability and is strongest from the east gradient, indicating that the conductor is further to the east of the hole at that depth.

3.1.2 Hole HP10-43

The apparent resistivity profile shows a decrease in resistivity centered at

a downhole depth of approximately 87.5 m (strong from the east gradient) and 97.5 m (strong from the west gradient). These resistivity decreases are associated with high chargeability and are strongest from the east and west gradients respectively, indicating that the low resistivity and high chargeability zone is more to the east and west of the hole at those depths. The decrease in resistivity indicates the probable presence of a conductor.

3.1.3 Hole HP10-44 The apparent resistivity profile shows three low resistivity zones centered

at downhole depths of approximately 102.5 m, 137.5 m and 187.5 m. The first low resistivity zone is strongest from the east gradient, indicating that the zone is more to the east direction at that depth. The second low resistivity zone is strongest from the north gradient, indicating that the zone is more to the north direction at that depth. The third low resistivity zone is strongest from the west gradient, indicating that the zone is more to the west direction at that depth. The three low resistivity zones are associated with high chargeabilities at those depths. The low resistivity indicates the probable presence of a conductor.

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3.1.4 Hole HP10-45 Unfortunately, the data collected from this hole is not good enough to interpret. Resurveying this hole is highly recommended.

3.1.5 Hole HU89-6

The apparent resistivity profile shows a conductor centered at a downhole

depth of approximately 142.5 m. This conductive zone is associated with high chargeability and is strongest from the south gradient, indicating that the conductor is further to the south of the hole at that depth.

3.1.6 Hole HU89-9 Both the apparent resistivity and chargeability profiles do not show any distinct features. The apparent resistivity is relatively high and the chargeability is generally low for this hole.

4 INVERSION MODEL RESULTS

The 3D models of the conductivity and chargeability distribution are discussed in the following sections. The inversions were calculated by the University of British Columbia inversion software DCIP3D using the borehole gradient IP/Resistivity data as input. The models are presented as conductivity/resistivity and chargeability distribution maps. The models are archived on the accompanying CD as a Geosoft OASIS MONTAJ® project file that can be viewed, sliced, rotated and zoomed as desired in 3D with the Geosoft MONTAJ® viewer (free copy can be downloaded from www.geosoft.com).

3D conductivity and chargeability models from borehole gradient IP/Resistivity data have been calculated for six holes. The grid cell size of a single cell for gradient IP/Resistivity model was 5 m X 5 m X 5 m. The models are presented as a 3D distribution of conductivity and chargeability over the mesh area. The models can be used in comparison with the profile plots to pick possible targets. To accomplish this, the models can be sliced, rotated and zoomed as desired in 3D view. As an example, a possible chargeability zone is shown in Figure 4.

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Figure 4: 3D chargeability model showing possible target zone JVX conducted spectral IP/Resistivity and magnetic surveys on the Herrick grid in May 2010. The work was done for Platinex Inc. under JVX job number 10-27. The JVX report is dated June 2010. Using the results of the IP/Resistivity and magnetic surveys, cross sections of the magnetic susceptibility models were drafted onto 2D cross sections of the surface IP/Resistivity models. Borehole traces were then added. The resulting maps show the locations of the IP sources, magnetic sources and existing boreholes in two dimensions. Line 1300N From station 500W to 450W, there is a weak chargeability source on surface that is associated with an increase in resistivity. The depth extent of this anomaly is unknown and the line would have to be extended to determine this. At station 190W, there is a weak chargeability source at depth between 50 m and 70 m that is associated with an increase in resistivity. There may be a narrow surface expression of this zone at station 230W. At station 130W, there is a weak chargeability source at depth between 50 m and 70 m that is associated with an increase in resistivity. This zone is

Possible target zone

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magnetic and neither the magnetic source nor the chargeability source is seen at surface level. From station 60E to 90E, there is a weak chargeability source at depth between 30 m and 40 m. The source is magnetic and is not resistive. A short hole drilled with an eastward dip could be used to test this anomaly. From station 120E to 170E, there is a weak chargeability source on surface that is associated with an increase in resistivity. The depth extent of this anomaly is limited (see Figure 5). Line 1400N From station 330W to 360W, there is a weak chargeability source on surface that is associated with an increase in resistivity. The depth extent of this anomaly is limited. From station 270W to 240W, there is a weak chargeability source at depth between 50 m and 70 m that is associated with an increase in resistivity. This zone is nonmagnetic and possibly not seen on surface (but possibly observed at 210W). This zone should be tested by drilling if it has not been already. Neither the magnetic source nor the chargeability source is seen at surface level. At station 30E there is a weak chargeability source on surface that is associated with an increase in resistivity. This zone is magnetic. From station 30E to 100E, there is a west dipping chargeable source that connects to the surface around 100E to 120E. The zone dips to the west and has an undetermined depth extent since it is deeper than the depth of penetration of the IP/Resistivity survey. This zone was interested by HP10-45 at approximately in-hole depths of 100 m to 150 m. HP10-45 nearly perfectly intersected the core of the IP/Resistivity zone. This zone was interested by HU89-6 at approximately in-hole depths of 40 m to 70 m. If these holes yield favourable results, then additional deeper passes of IP/Resistivity surveys could be used to delineate the chargeable zone at greater depths. At approximately station 30E there is a near vertical conductive zone which extends from surface to beyond the investigation of the IP/Resistivity survey. From station 200E to 250E, there are several small IP sources near surface that are associated with high resistivities and are also magnetic. In order to fully survey these sources, the IP/Resistivity and magnetic surveys would have to be continued when the lake is frozen (see Figure 6).

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Figure 5: 2D chargeability and resistivity model of Line 1300N

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Figure 6: 2D chargeability and resistivity model of Line 1400N

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5 SUMMARY AND RECOMMENDATIONS Borehole Directional Induced Polarization and Resistivity surveys were done on the Herrick grid, Shining Tree Project, Northern Ontario. The work was done for Platinex Inc. by JVX Ltd. under JVX job number 10-73. The field work was done in the period from September 29 to October 3, 2010. A total of six holes were surveyed. 3D conductivity and chargeability models from borehole gradient IP/Resistivity data have been calculated for the six holes. It is recommended to survey all of the holes with a detection (pole-dipole) array to determine the mineralization in the vicinity of the holes. Hole HP10-45 should be resurveyed as the acquired data was not good. Also, a cross-hole or 2D-array imaging survey is recommended to map mineralization between holes that are on the same plane. Computing inversion models on the combined, gradient and cross-hole data set will yield better defined mineralization zones in three-dimension. Respectfully submitted, Blaine Webster, B.Sc., P.Geo. December 6, 2010

Certificate of Qualifications

Blaine Webster President - JVX Ltd.,

60 West Wilmot Street, Unit 22 Richmond Hill, Ontario L4B 1M6

Tel : (905) 731-0972 Email : [email protected]

I, Blaine Webster, B. Sc., P. Geo., do hereby certify that

1. I graduated with a Bachelor of Science degree in Geophysics from the University of British Columbia in 1970.

2. I am a member of the Association of Professional Geoscientists of

Ontario.

3. I have worked as a geophysicist for a total of 36 years since my graduation from university and have been involved in minerals exploration for base, precious and noble metals and uranium throughout much of the world.

4. I am responsible for the overall preparation of this report.

______________________ Blaine Webster, B. Sc., P. Geo.

Appendix A:

Instrument Specification Sheets

IRIS INSTRUMENTS

ELREC Pro

10 CHANNELS

IP RECEIVER FOR

MINERAL EXPLORATION

• 10 simultaneous dipoles

• 20 programmable chargeability windows

• High accuracy and sensitivity

ELREC Pro: this new receiver is a new compact and low consumption unit designed for high productivity Resistivity and Induced Polarization measurements. It features some high capabilities allowing to work in any field conditions.

Reception dipoles: the ten dipoles of the ELREC Pro offer an high productivity in the field for dipole-dipole, gradient or extended poly-pole arrays.

Programmable windows: beside classical arithmetic and logarithmic modes, ELREC Pro also offers a Cole-Cole mode and a twenty fully programmable windows for a higher flexibility in the definition of the IP decay curve.

IP display: chargeability values and IP decay curves can be displayed in real time thanks to the large graphic LCD screen. Before data acquisition, the ELREC Pro can be used as a one channel graphic display, for monitoring the noise level and checking the primary voltage waveform, through a continuous display process.

Internal memory: the memory can store up to 21 000 readings, each reading including the full set of parameters characterizing the measurements. The data are stored in flash memories not requiring any lithium battery for safeguard.

Switching capability: thanks to extension Switch Pro box(es) connected to the ELREC Pro unit, the 10 reception electrodes can be automatically switched to increase the productivity in-the-field.

ELREC Pro unit with its graphic LCD screen

Display of numeric values and IP decay curve during acquisition

Monitoring of the Primary voltage waveform before acquisition

ELREC Pro

FIELD LAY-OUT OF AN ELREC PRO UNIT

The ELREC Pro unit has to be used with an external transmitter, such as a VIP transmitter. The automatic synchronization (and re-synchronization at each new pulse) with the transmission signal, through a waveform recognition process, gives an high reliability of the measurement. Before starting the measurement, a grounding resistance measuring process is automatically run ; this allows to check that all the electrodes are properly connected to the receiver. Extension Switch Pro box(es), with specific cables, can be connected to the ELREC Pro unit for an automatic switching of the reception electrodes according to preset sequence of measurements ; these sequences have to be created and uploaded to the unit from the ELECTRE II software.

The use of such boxes allows to save time in case of the user needs to measure more than 10 levels of investigation or in case of large 2D or 3D acquisition. DATA MANAGING

PROSYS software allows to download data from the unit. From this software, one has the opportunity to visualize graphically the apparent resistivity and the chargeability sections together with the IP decay curve of each data point. Then, one can process the data (filter, insert topography, merge data files…) before exporting them to ″txt″ file or to interpretation software: RES2DINV or RESIX software for pseudo-section inversion to true resistivity (and IP) 2D section. RES3DINV software, for inversion to true resistivity (and IP) 3D data.

FEATURES TECHNICAL SPECIFICATIONS

• Input voltage: Max. input voltage: 15 V Protection: up to 800V

• Voltage measurement: Accuracy: 0.2 % typical Resolution: 1 µV Minimum value: 1 µV

• Chargeability measurement: Accuracy: 0.6 % typical

• Induced Polarization (chargeability) measured over to 20 automatic or user defined windows

• Input impedance: 100 MΩ • Signal waveform: Time domain (ON+,OFF,ON-,OFF)

with a pulse duration of 500 ms - 1 s - 2 s - 4 s - 8 s • Automatic synchronization and re-synchronization

process on primary voltage signals • Computation of apparent resistivity, average

chargeability and standard deviation • Noise reduction: automatic stacking number in relation

with a given standard deviation value • SP compensation through automatic linear drift

correction • 50 to 60Hz power line rejection • Battery test GENERAL SPECIFICATIONS.

• Data flash memory: more than 21 000 readings • Serial link RS-232 for data download • Power supply: internal rechargeable 12V, 7.2 Ah

battery ; optional external 12V standard car battery can be also used

• Weather proof • Shock resistant fiber-glass case • Operating temperature: -20 °C to +70 °C • Dimensions: 31 x 21 x 21 cm • Weight: 6 kg

IRIS INSTRUMENTS - 1, avenue Buffon, B.P. 6007 - 45060 Orléans Cedex 2, France Phone: +33 (0)2 38 63 81 00 - Fax: +33 (0)2 38 63 81 82 E-mail: [email protected] - Web site: www.iris-instruments.com

Extension Switch Pro box able to drive 24 - 48 - 72 or 96 electrodes

Appendix B:

Surveys, Personnel, Data Processing and Production

Platinex Inc. JVX 10-73 1

Appendix B Surveys, Personnel, Data Processing and Production

The survey coverage for the gradient BHIP array is listed in table 1.

Borehole ID Gradient Array From Depth

(m)

To Depth

(m)

Separation (m)

Date

HP09-33

North, East, South, West,

a = 5 m (n = 1)

-10 -175 165 September 29, 2010

HP10-43


a = 5 m (n = 1)

-15 -110 95 October 1, 2010

HP10-44


a = 5 m (n = 1)

-255 -120

-120 -10

245 October 1, 2010 October 2, 2010

HP10-45


a = 5 m (n = 1)

-25 -135

-125 -330

305 October 2, 2010 October 3, 2010

HU89-6


a = 5 m (n = 1)

-15 -65

-65 -154

139 September 30, 2010

October 1, 2010

HU89-9


a = 5 m (n = 1)

-105 -15 90 September 30, 2010

Table 1: Survey Coverage for the Gradient (Direction) Array

Measurement Configurations

1. Gradient Array (Direction Logs)

Directional Gradient surveys used large current dipoles located on the surface, East, West, North or South of the borehole collars. Potential readings were taken simultaneously using 5 m dipoles with current injection either East or West or North or South of each borehole.

Appendix B: Surveys, Personnel, Data Processing and Production


Figure 3: Borehole Electrode Geometry

Personnel Dennis Palos, senior geophysicist from JVX acted as crew chief and was responsible for all technical aspects and data accuracy of the survey. Two field assistants were also engaged in the survey. Data processing, inversion, modeling, plotting and report writing was handled by Haileyesus Wondimu, (P. Geo. pending). The work was supervised by Haileyesus Wondimu and Alex Jelenic. Blaine Webster, P. Geo., President of JVX, is the responsibility holder under the certificate of authorization issued to JVX Ltd. by the APGO.

Geophysical Instrumentation

JVX supplied the geophysical instruments listed in table 2. Specification sheets for the instruments are provided in Appendix A.



BOREHOLE IP/RESISTIVITY SURVEYS

Transmitter GDD TXII 1800W

Receiver Elrec Pro

Array Types

Gradient Direction Log: 5 m dipoles

Transmit Cycle Time 2 sec

Receive Cycle Time 2 sec

Station Spacing 5 m for the Gradient array

Number of Holes Surveyed 6

Table 2: Specifications for the Borehole IP/Resistivity Surveys

1. IP Transmitter A GDD TXII 1800W transmitter was used for the surveys. This transmitter generates an interrupted square wave with a pulse width of two (2) seconds. The polarity is inverted between subsequent current pulses. The transmitter output current, wattage circuit resistance are indicated on the transmitter console. Voltages are selectable from 100V to 2400V.

2. IP Receiver (Elrec Pro)

The Elrec Pro time domain IP receiver can take readings with up to 10 receiver dipoles. The IP decay is measured in millivolts/volt over up to 20 programmable windows. For this survey, the IP decay was measured over 19 windows. Time settings for these 19 windows are listed in table 3. All times are in milliseconds after current shut off. A 2 second current pulse was used throughout. Specification sheets are attached.

slice start end duration mid pointM0 50 70 20 60 M1 70 110 40 90 M2 110 150 40 130 M3 150 190 40 170 M4 190 230 40 210 M5 230 270 40 250 M6 270 310 40 290 M7 310 380 70 345 M8 380 450 70 415 M9 450 530 80 490 M10 530 610 80 570



slice start end duration mid pointM11 610 690 80 650 M12 690 780 90 635 M13 780 900 120 840 M14 900 1050 150 975 M15 1050 1210 160 1130 M16 1210 1380 170 1295 M17 1380 1570 190 1375 M18 1570 1770 200 1670

Table 3: Elrec Pro chargeability windows

For each dipole pair, the Elrec Pro records line/stations of the current and potential electrodes, the primary voltage (mV), self potential (mV), 19 chargeability values (mV/V) and the transmitted current (mA). The apparent resistivity is calculated from the primary voltage and transmitted current using K factors based on array geometry. Mx chargeability, the IP slice most often presented in surveys done with the Scintrex IPR12 receiver, is centered at 870 msec (690 to 1050 msec). M13 at 840 msec (780 to 900 msec) from the Elrec Pro is the closest IP slice to Mx. One could get closer to Mx by calculating the weighted average of M12, M13 and M14 as (0.9*M12+1.2*M13+ 1.5*M14)/3.6. Data Processing System

1. Borehole IP Profiles Raw data files from the Elrec Pro were sorted by hole and array type and converted to tab delimited text files. These were imported into Excel® after pre-processing using JVX’s in-house software and a series of JVX proprietary macros were used to analyse and plot the results. Profile plots of all of the data are presented and the complete spreadsheets or PDF’s are provided on the accompanying archive CD. All of the data from the surveys were re-processed and formatted as observation files for input into the UBC-GIF DCIP3D inversion modelling routines. The details of the inversion modelling are given in the following section. Three-dimensional models of the conductivity and chargeability obtained from the inverse model calculations were converted for presentation as a Geosoft® Oasis Montaj® Target® project.

2. Conductivity and Chargeability Inversion The electrical properties of structures in the subsurface give rise to anomalies in the data of a survey. In order to retrieve information on these electrical properties from the data, JVX applies a processing tool called inversion. In this process all of the data are used to constrain a model according to certain criteria. These criteria are necessary in order to overcome problems due to noise and, most importantly, to overcome the large difference between the number of grid cells in the model and the number of data points. JVX uses the inversion routines (DCIP3D) developed by the Geophysical Inversion Facility of the University of British Columbia to determine the model. These routines allow 3D



modelling and inversion of the electrical properties of the subsurface in an iterative way using the Gauss-Newton method, in which a smoothness constraint is used to stabilize the inversion. The output model strikes a balance between fitting the measured data and preserving the smoothness of the model. In the DCIP3D routines, a pure DC conductivity model is calculated first. Later it can be used in the inversion of the IP data to obtain the chargeability model. As current flows through the subsurface farther from a certain location less information on the electrical properties is provided for that location. This is represented in the inversion by a loss in sensitivity in areas farther away (both vertically and horizontally) from the locations of the current source and the receiver electrodes. The final model therefore must be interpreted with care. Structures at a distance cannot be accepted with the same level of confidence as structures close to the source and receiver electrode locations.



JVX LTD.

BHIP SURVEY DAILY FIELD PRODUCTION REPORT

Project No: 10-73 Client: Platinex Inc. Area: Shining Tree, ON Week Ending: Oct. 2, 2010

Day Description Hole

From (m)

To (m)

Length (#stations)

Sun. Sept.26

Dennis mobilizing to job. Jeff is on mobilization – Wawa to Gowganda. Jeff started mobilizing on Sept. 25

Mon. Sept. 27

We loaded up the equipment, drove to the turnoff, and on the bush road lost the brakes. Grant went with the quad and got some brake fluid. We got back to Gowganda very carefully. Not chargeable to client.

Tue. Sept. 28

Haul in the equipment, set up the gradients, set up the transmitter tents, raise wires for road crossings.

Wed Sept. 29

Do the gradient survey on HP-09-33 with the ELREC-PRO. Also try 89-9 with the IPR-12, until it stopped working.

09-33 -10 -175 165 m, 33 stations

Thu. Sept. 30

Surveying with the 302 m cable in HP-09-33, and tested the 182 m cable in HU-89-9.

89-9 89-6

-105 -15

-15 -65

Fri. Oct. 1

We completed HU89-6. Note: HP-10-42 is blocked at a depth of 7 m. We read HP-10-43, and we started HP-10-44.

89-6 10-43 10-44

-65 -15 -255

-154 -110 -120

Sat. Oct. 2

We completed HP10-44 with the multi-conductor cable. We started reading HP10-45 with a triple pulley tree and black wire.

10-44 10-45

-120 -25

-10 -125

Production: X Mob/Demobilization: M Standby: S Logistics & Preparation: L

Name Position S M T W T F S Dennis Palos Grant Trajkowicz Jeff Boettcher

Geophysicist Helper Helper

M M

S S S

X X X

X X X

X X X

X X X

X X X



JVX LTD.

BHIP SURVEY DAILY FIELD PRODUCTION REPORT

Project No: 10-73 Client: Platinex Inc. Area: Shining Tree, ON Week Ending: Oct. 9, 2010

Day Description Hole

From (m)

To (m)

Length (#stations)

Sun. Oct. 3

Finish reading HP10-45. We picked up all of the gradient wire and hauled out the equipment so we could finish the project today. 11 hour day

10-45 -135 -330

Mon. Oct. 4

Tue. Oct. 5

Wed. Oct. 6

Thu. Oct. 7

Fri. Oct. 8

Sat. Oct. 9

Production: X Mobilization/Demobilization: M Standby: S Logistics & Preparation: L

Name Position S M T W T F S Dennis Palos Grant Trajkowicz Jeff Boettcher

Geophysicist Helper Helper

X X X

Appendix C:

BHIP Directional Log Profiles

Platinex Inc. - HP09-33 - Shining Tree Project, Churchill Township

Apparent Resistivity Rho (ohm.m), a = 5m

Gradient BHIP

JVX Ltd ref. # 10-73 - Depth Scale 1:1000

110

100

1000

10000

100000

1000000

0 20 40 60 80 100 120 140 160 180 200 220 240 260 280 300 320 340 360

Depth (m)

Apparent Resistivity (ohm.m)

North East South West


Mx Chargeability (mV/V), a = 5m

Gradient BHIP


010

20

30

40

50

60

70

0 20 40 60 80 100 120 140 160 180 200 220 240 260 280 300 320 340 360

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Gradient BHIP


110

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Gradient BHIP


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90

0 20 40 60 80 100 120 140 160 180 200 220 240 260 280 300 320 340 360

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Gradient BHIP


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0 20 40 60 80 100 120 140 160 180 200 220 240 260 280 300 320 340 360

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Gradient BHIP


110

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0 20 40 60 80 100 120 140 160 180 200 220 240 260 280 300 320 340 360

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Gradient BHIP


0.00

50.00

100.00

150.00

200.00

250.00

300.00

0 20 40 60 80 100 120 140 160 180 200 220 240 260 280 300 320 340 360

Depth (m)



Platinex Inc. - HU89-6 - Shining Tree Project, Churchill Township


Gradient BHIP


110

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0 20 40 60 80 100 120 140 160 180 200 220 240 260 280 300 320 340 360

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Gradient BHIP


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Gradient BHIP


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Gradient BHIP


02

46

810

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Appendix D:

Introduction to BHIP Basic Models

1

Down Hole IP: Some Basic Model Results

This material is provided to clients of JVX Ltd. for their sole use. The permission of the author or of JVX Ltd. is required for any further reproduction or distribution.

For more than 40 years, induced polarization has been used in the search for disseminated metallic sulphides (+ gold). Borehole or down hole IP, the extension of the method to off-hole exploration, has always been available but rarely used. This should be compared to down hole EM, a method that is often used to map off-hole conductors and direct further drilling. Reluctance to use DHIP can be traced to a number of factors including a mixed record in a limited number of surveys and the lack of even the simplest model results to direct survey design and to form the basis for the interpretation. Commercial grade DHIP software for full 3D simulations is now available and results from some simple models should help with a broader understanding of how and where DHIP should be used. Areas of interest include electrode arrays and sampling, the exploration radius of detection logs and the best current layout for effective direction logs. 1. Detection Survey DHIP profiles for what may be the simplest case are shown in figure 1. An inclined borehole runs through the center of a 5 m wide chargeable body at a down hole distance of 318 m. The plane of the body is normal to the borehole. The pole-dipole array with a=25 m and n=1,4 has been used. The potential electrodes lead the current electrode down hole. Modeling methods and parameters are outlined in the attached notes.

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Figure 1. DHIP profiles for IPR12 M8 (935 msec) in mV/V. n=1 (red), n=2 (green) n=3 (light blue) and n=4 (dark blue). See explanatory notes for details.

As might be expected, the profiles are similar in form to those seen for surface surveys over a shallow tabular body. Gradients are, at times, very steep and this suggests tight sampling to fully define (and subsequently interpret) response profiles. Over anomalous sections, the sampling interval should be no more than half the ‘a’ spacing; one quarter would be best.

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DHIP profiles for chargeable bodies of different sizes are shown in figure 2. The target is still centered on the hole. Borehole, target and array are otherwise as in figure 1.

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Figure 2. DHIP profiles (n=1 solid, n=4 dashed) for targets of different sizes. Red (100x100x5 m), blue (200x200x5 m) and green (50x50x5 m).

IP anomaly forms are similar to those seen in surface surveys over shallow, depth limited tabular bodies. Responses from the early dipoles are largely unaffected by target size over this range. Response amplitudes for the later dipoles reflect target size. Off-Hole Targets DHIP response profiles for bodies that are 5, 25 and 50 m from the bore hole (at closest approach) are shown in figure 3. This is equivalent to moving the center of the 100x100x5 m target 55, 75 and 100 m from the survey hole. Borehole, array and target are as in figure 1.

As expected, peak response amplitudes fall off quickly for increasing off-hole separation. The rate of fall-off is similar to what would be seen in a surface survey with the same array, target and target separations but overall chargeability amplitudes are about half for the down hole survey. This is related to the primary current distribution in a full versus a half space. Note that the response profiles for the target that is very close to the holes are similar in shape to those for a target that is intersected (figures 1 and 2). The main difference is the depths of the central IP low for the n=1 dipole. Response profiles for targets that are more distant from the bore hole are distinct from those from holes that intersect or come very close to the target.

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Figure 3. DHIP profiles (n=1 solid, n=4 dashed) for off-hole targets. Target off-hole distances (at closest approach) are 5 m (red), 25 m (light blue) and 50 m (dark blue). These results suggest the radius of detection for off-hole targets is about half that of the depth of exploration for surface IP surveys of the same style. For the pole-dipole array with a=25 m, n=1,4, the radius of detection appears around 25. Larger values would apply to simple targets, little geologic noise and high quality DHIP data. High quality can be taken to include the appropriate array, a sufficiently small measurement interval and stacking for measurements to 0.01 mV/V. Direction Surveys A detection survey may reveal chargeable bodies off-hole. If the IP data is of good quality, it may be possible to estimate the off-hole distance to the chargeable body. The direction to the target however, is unknown. Current electrode arrays that have been used in direction surveys include azimuth, gradient and cross-hole. In an azimuth survey, one current electrode is placed near the collar and another some distance from the collar. This distance is of the same order as the hole length. DHIP data are collected for the distant current set out at four cardinal directions.

In one form of a gradient survey, both current electrodes are placed at equal distance from the collar; the normal to the current dipole is directed at the collar and is set out at four cardinal directions. The length of the current bipolar and the distance from the current bipolar to the collar are of the same order as the hole depth. Designers have to guard against current dipole layouts that produce very low primary voltages anywhere along the axis of the borehole.

In cross-hole surveys, the current dipole is placed in a neighboring drill hole. For targets at extreme depths, this may be the only direction survey option. DHIP profiles for the azimuth survey are shown in figure 4. The target 100x100x5 m target is 25 m west of the hole at closest approach (318 m down hole). The potential electrode separation is 25 m.

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Figure 4. DHIP profiles, direction (azimuth) survey. Current dipole is west (red), north (dark blue), east (light blue) and south (green) of the collar.

The current dipole west of the drill hole and over the target gives the strongest IP anomaly with a peak amplitude of 2.20 mV/V. Peak amplitudes for the other three current diploes are 1.61 (north), 1.83 (east) and 1.94 (south). The relative difference in peak amplitudes is from 1.13 to 1.37.

As with most active geophysical methods, the relative change in peak amplitude is, to a first approximation, explained by differences in the distances from current dipole to potential dipole and from current dipole to the target. These differences are less for a smaller, more concentrated target. The ratio of peak IP anomalies, west and east diploes, is only 1.07 for a 25x25x25 m block 25 m west of the survey hole (at closest approach). Such small differences would probably be lost in a survey burdened with any amount of measurement and geologic noise. Note that anomaly shape is similar to the n=1 detection profile (see figure 3) but overall amplitudes in the direction survey are about 50% larger. Overall amplitudes are about equal to the n=2 detection response (not shown). Differences in anomaly shape are largely due to differences in coupling between the primary field and the target, differences that disappear for a small, circular target. DHIP profiles for a gradient array are shown in figure 5. The current dipole is 500 m long and its center point is 500 m east and west of the collar. The north and south arrays cannot be used because primary voltages along the hole axis is near zero.

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Figure 5. DHIP profiles, direction (gradient) survey. Solid for array west of collar (over target), dashed for array east of collar. Red for 100x100x5 m prism, plane normal to hole, 25 m west of hole (at 318 m) at closest approach. Green is for a vertical prism, plane 45° to hole. Blue is for a 25x25x25 m prism, 25 m west of hole at closest approach.

Absolute and relative amplitudes are higher than for the azimuth array. The ratios of peak

amplitudes from the west and east arrays are 1.52 for the 100x100x5 m target normal to the hole and 1.24 for the cubic target. These factors make the gradient array the better choice. The change in polarity is a bonus. The smaller ratio of west to east peak amplitudes (1.24) for the smaller target is because of smaller differences in the relative geometry of current bipole / potential dipole / effective target center.

The gradient array appears to work better than the azimuth array but the current bipoles must be set out for a reasonable Vp profile. Reasonable means of sufficient amplitude, uniform or slowly varying and of one sign (no zero crossings).

Given limits on relative geometric differences, azimuth and gradient arrays are restricted to ‘shallow’ targets. Cross-hole direction surveys may be the only option for ‘deep’ targets. Given enough cross-hole options, it should also be possible to insure a well behaved Vp profile. DHIP profiles for a direction (cross-hole) survey are shown in figure 6. Parallel drill holes with collars 500 m west, north, east and south are assumed. In each case, the current electrodes are at the collar and 500 m down hole. The target is a 100x100x5 m prism, 25 m west of the survey hole.

Peak responses are 2.79 mV/V (west), 1.50 mV/V (north), 1.75 mV/V (east) and 1.70 mV/V (south). The ratio of west to east peaks is 1.59 which is better than gradient (1.52) or azimuth (1.20). The distinctive polarity reversal of the gradient array is not seen.

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Figure 6. DHIP profiles, direction (cross-hole) surveys. 500 m current dipole, 500 m from Survey hole. Current diploes are west (red), north (dark blue), east (light blue) and south (Green) of survey hole.

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Figure 7. DHIP profiles, cross-hole survey. 250 m current dipole, 250 from survey hole. Current diploes are west (red), north (dark blue), east (light blue) and south (green) of the survey hole.

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Relative IP amplitudes are primarily a function of the relative distances – current electrodes to potential electrodes and current electrodes to the target. The dependence on the distances to the current electrodes may be increased by making the transmitter act more as a current dipole by reducing the current electrode separation.

Figure 7 shows the cross-hole DHIP profiles for parallel holes that are 250 m west, north, east and south of the survey hole. The current dipole is 250 m long and is centered at the depth of the target. The current dipole is deliberately set opposite a target that would have been found in an earlier detection survey. The ratio of peak amplitudes for the 250 m current dipole, west and east surveys, is 2.98 and the best of all direction survey methods considered here. The high chargeability values at the bottom of the hole for the northern current dipole are because Vp is approaching zero. Secondary voltages from the target, although getting smaller, are not approaching zero at the same rate and this gives a false DHIP anomaly.

The spike at 230 m from the south current dipole is because the primary voltage goes through zero (i.e. changes polarity) at this point. Secondary voltages from the target, although small, do not go through zero and this produces another false DHIP anomaly. The anomaly shape would suggest this but recognition depends on adequate sampling.

These results show why it is so important that the current diploes must be set so that the down hole Vp profile is well behaved. Current arrays that give a poorly behaved Vp profile may produce false DHIP anomalies and should be avoided.

Summary

1. General Conditions. For detection surveys, sample at 1/2 the potential electrode spacing; increase to 1/4 in anomalous regions. Some relaxation of these rules may be possible for direction surveys. During each measurement cycle, monitor M0 and M8 (or equivalent) for convergence to .01 mV/V. Model everything. For detection surveys, this includes forward modeling to simulate response profiles for possible or probable targets. Adjust detection array and sampling as needed. For direction surveys, model the Vp profile and adjust current diploes accordingly. Forward and/or inverse modeling for interpretation of the survey results. 2. Detection survey. The standard pole-dipole array is preferred. Pole-dipole arrays with multiple ‘a’ spacing electrode strings suffer from inadequate sampling (short ‘a’) and/or over sampling (long ‘a’). For all DHIP anomalous zones, determine grain size. Scale anomaly amplitudes accordingly. 3. Direction survey. Where there are neighbouring drill holes in appropriate locations, cross-hole is the preferred method. Detection and direction surveys in a 250 to 500 m mesh of drill holes would constitute the most complete survey for disseminated sulphides below the limits of surface surveys. Without neighbouring drill holes, direction (gradient array) surveys are the best option.

Ian Johnson March 1, 2004

Explanatory Notes 1. All simulations are based on results from GeoTutor III V6.4 from PetRos EiKon Inc. See www.PetRosEiKon.com. 2. For the results show here, the borehole is directed to the north, is inclined 45° below horizontal and is 500 m long. The chargeable body is a prism. The width of the prism is normally 5 m. The strike length and depth extent are normally 100 m. Other models considered are 50x50x5 m, 200x200x5 m and 25x25x25 m. The center of the prism is 225 m below grade. The center is

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either at the drill hole (318 m mark) or west of the drill hole (off-hole targets). The plane of the prism is commonly normal to the axis of the drill hole (i.e. dips at 135°). 3. The chargeable body has been assigned the following electrical properties (Cole-Cole impedance model).

DC resistivity : 10,000 ohm.m true chargeability : 0.5 V/V time constant : 1 second c value : .5

The host rock has a resistivity of 10,000 ohm.m. 4. The IP measurement is assumed to be M8 from the Scintrex IPR12 time domain IP receiver. The primary voltage is measured from 0.2 to 1.6 seconds of the current on time. The M8 slice is centered at 935 msec after shut-off of a 2 second transmitter current pulse. The time constant used (1 second) insures a relatively high response in the M8 slice. Much shorter or longer time constants would result in M8 anomaly amplitudes less than shown. 5. It has been assumed that Vp is positive when Pi is at a higher potential than Pi+1 and that this holds true for all potential electrodes in the order that they are connected to the receiver. Chargeabilities are positive if Vp and Vs are of the same sign, negative if of opposite sign. In modeling chargeabilities therefore, the sign (or polarity) of Vp and Vs may be changed without changing the simulated chargeability.

report on borehole induced polarization surveys herrick

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