geophysical survey report covering borehole pulse em
TRANSCRIPT
APPENDIX VII
Crone Geophysics & Exploration Limited
Geophysical Survey Report
On the
URSA Major Minerals Incorporated
Nickel Offset Mine Option Property
Foy Township, Ontario
By: Kevin Ralph; Geophysicist, Crone Geophysics
January 2010
98
Geophysical Survey Report
covering
Borehole Pulse EM Surveys over the
Nickel Offsets Property for
Ursa Major Minerals during
November- December 2009
by
CRONE GEOPHYSICS & EXPLORATION LTD.
Survey Area: Nickel Offsets Property, Near Sudbury, Ontario
Survey Type: Borehole Pulse EM Surveys
Survey Operator: Jus tin Pittman
Borehole Surveys: U-15-01, U-15-02, U-15-04, U-15-05
Survey Period: November 23rd 2009 to December 16th, 2009
Report By: Kevin Ralph
Report Date: January 2010
Crone Geophysics & Exploration Ltd.
TABLE OF CONTENTS
PULSE ELECTROMAGNETIC SURVEY
1.0 INTRODUCTION
2.0 PROPERTY LOCATION
3.0 PERSONNEL
4.0 SURVEY METHODS
5.0 SURVEY PARAMETERS
6.0 PRODUCTION SUMMARY
APPENDICES
APPENDIX I: PLAN AND SECTION MAPS
APPENDIX II: LINEAR (5-AXIS) PULSE EM DATA PROFILES
APPENDIX III: PULSE EM DATA PROFILES (LIN-LOG SCALE)
APPENDIX IV: CRONE INSTRUMENT SPECIFICATIONS
Geophysical Survey Report
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FIGURE 1:
FIGURE 2:
TABLE I:
TABLE II:
TABLE III:
TABLE IV:
TABLE V:
Crone Geophysics & Exploration Ltd.
LIST OF FIGURES
Nickel Offset Property Location
Geological Plan of the Nickel Offsets Property
LIST OF TABLES
TRANSMITTER LOOP COVERAGE
BOREHOLE SURVEY COVERAGE
CHANNEL CONFIGURATION 50 msec
CHANNEL CONFIGURATION 16.66 msec
PRODUCTION SUMMARY
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1.0 INTRODUCTION
Crone Geophysics & Exploration Limited was contracted by Ursa Major Minerals to conduct 30 Borehole Pulse Electromagnetic Surveys on its Nickel Offsets property Near Sudbury, Ontario. This report summarizes the geophysical work carried out in November-December 2009.
Five (5) holes were surveyed during the survey period November 23rd to December 16th 2009, utilizing four separate transmitting loops. The appendices to this report contain page size plan and section maps, PEM profiles (linear 5-axis and logarithmic scale), and Crone Instrument Specifications.
2.0 PROPERTY LOCATION AND ACCESS (From: A.C.A. HOWEE INTERNATIONAL LIMITED Report No. 888)
The Nickel Offsets Property ("Property") lies within the Sudbury Mining District situated within central eastern Foy Township, Ontario. The Property includes the Nickel Offsets approximately 40 km north-northwest of the city of Sudbury. The Property includes the nickel Offsets Mine, a significant past-producing nickel and copper operation between 1943 and 1957. The city of Sudbury lies along the TransCanada highway connecting Western Canada to Toronto and to Ottawa and points east.
Prior to 2005, access into the Nickel Offsets Property was via an unOmaintained dirt and gravel road otherwise known as the Sandcherry Creek road. This road originates in the town of Larchwood (part of greater Sudbury) situated some 32 km to the south of the property on Hwy 144. The Sandcherry Creek Road winds through rugged hilly terrain that crosses Sandcherry Creek and other creeks in at least five locations. All bridges were removed a number of years ago, but in some places log crossings have been established to facilitate the fording of creeks. During the drier summer months, 4-wheel drive trucks may be able to reach the Property directly. Otherwise all-terrain vehicles (ATVs) are required during wetter periods, or snowmobiles during the winter. Though not maintained, the road is in good condition as it is well-traveled by local hunters, anglers and trappers year-round. It is not suitable however, for the movement of heavy equipment.
During the winter of 2004/2005, a logging road reached the Property from the west. Access for the 2005 summer program was made by turning off a main logging haul road just northeast of Levack onto the Little Sandcherry Creek Road which provides access by vehicle to kilometer 15, within about 4.5 km of the western Property boundary. At the time of the Program, the road over the last 4.5 km into the Property was an un-maintained winter road that could be negotiated by 4-wheel drive trucks only under the best of conditions. A bulldozer pulled the drill equipment into the
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Property. Otherwise, A TV s were used for daily access from kilometer 15. It is anticipated that the final 4.5 km into the Property will soon be graveled for advanced logging operations on the Property, which should provide year-round access. The entire 19.5 km into the Property is winding and quite hilly. Permission was required from Inco to use the main road which crosses their claims in the general area.
Road or trail access on the property within the immediate area of the Nickel Offsets Mine is rocky in places but generally good and easily negotiated by ATV.
The city of Sudbury, situated approximately 37 km to the southeast of the property, serves as the main support center for the region with several daily flights to Toronto. Owing to the fact that Sudbury is also a major mining center, the city contains many mining and exploration support services and businesses and is home to the Ontario Geological Survey. The city of Sudbury lies along Hwy 17; the Trans-Canada Highway connecting Western Canada to Toronto, Ottawa and points east. Of note, the small residential area just north of Chelmsford en route to the Sandcherry Creek Road hosts a small privately owned grass airstrip that services small single-engine aircraft.
C1 Outline of the Sudbury Igneous Complex •••• Ma1or Offset Dikes
Paved Road - Secondary (gravel) Road
Figure 1: Nickel Offset Property Location (From: A.C.A. HOWE£ INTERNATIONAL LIMITED Report No. 1188)
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c::::::J Gran~e 1-1 Gossan-OpenCut
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~ ~.U~t~4M.~I D f\ickel Offsets Orin Hole
g Claimline
Crone Geophysics & Exploralion Lid.
N
A 0 250
m8tres
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\ Figure 2: Geological Plan ofthe Nickel Offsets Proper(v
(From: A.C.A. HOWE£ INTERNATIONAL LIMITED Report No. 8881
3.0 PERSONNEL
The personnel involved in this project during the reporting period include:
Survey Operator: Justin Pittman
Data Processing: Kevin Ralph
Report: Kevin Ralph
4.0 SURVEY METHODS
Crone Pulse EM is a time domain electromagnetic method in which a precise pulse of current with a controlled linear shut off is transmitted through a large loop of wire on the ground and the rate of decay of the induced secondary field is measured across a series of time windows during the off-time. The EMF created by the shutting-off of the current induces eddy currents in nearby conductive material thus
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Crone Geophysics & Exploration Ltd.
setting-up a secondary magnetic field. When the primary field is terminated, this magnetic field will decay with time. The amplitude of the secondary field and the decay rate are dependent on the quality and size of the conductor.
On this project, a 3D Borehole Pulse EM system was assembled in which an axial component (Z) probe and a cross component (XY) probe were used to measure the three components of the induced secondary field. The first pass with the 'Z' probe detects any in-hole or off-hole anomalies and gives information on size, conductivity, and distances to the edge of conductors. The second pass with the 'XY' probe measures two orthogonal components of the EM field in a plane orientated at right angles to the borehole. These results give directional information to the center of the conductive body. Data is usually collected at a nominal sample interval of I Om.
The rotation of the XY probe is corrected through the use of an orientation tool, so that positive X points in the direction of the hole azimuth and positive Y is horizontal and points to the left of an observer looking down the hole.
The borehole surveys were carried out using a time base of either I6.66 ms ( I5 Hz), or 50ms (5 Hz), with a 1.5 ms shut-off ramp time (see Table
Crone Geophysics & Exploration Ltd.
data. The synchronization between the Transmitter and the Receiver was maintained by direct cable link.
Data units are nT/s.
5.0 SURVEY PARAMETERS
a e ransmllter T, bl I T, L oop c overaRe
Size Loop Location Ramp Current Loop Time Time Base (ms) (meters) UTM NAD83 Canada Zone 18N (ms) (amps)
481154E, 5178259N
01 -400x400 480954E,5177963N 1.5ms 18 50ms 481274E,5177775N 481434E,5178082N 481191E,5178271N 480955E,5177961N
01A -400x400 481274E,5177773N 1.5ms 20 16.66ms 481499E,5178094N 481273E,5178267N 481454E. 5179415N 482100E,5179143N
02 -800x800 481925E.5178419N 1.5ms 20 16.66ms 481780E,5178531N 481719E,5178465N 481305E,5178599N 480852E,5178600N 480711E,5178214N 481258E,5177960N 481349.E, 5177877N 481465E,5177856N
03 -800x500 481559E,5177758N 1.5ms 20 16.66 481676.E, 5177730N 481502E,5178015N 481531E,5178274N 481474E.5178358N 481044E,5178511N
Geophysical Survey Report
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Crone Geophysics & Exploration Ltd.
Table II: Borehole and Surface Survey Coverage
Collar Location (UTm) Collar Dip Collar Azimuth Length
Hole Tx loop Nad83 (degrees) (degrees)
Read (m)
U-15-01 Loop I 481352.8 5178217.5 -59.9 34.7 20-390 U-15-02 Loop I 481169.3 5178296.0 -52.3 21.2 20-335 U-15-04 Loop I 481169.3 5178296.0 -48.4 21.8 20-305
U-15-05 Loop lA 481318.9 5178264.5 -50.9 29.6 20-303
U-15-04 Loop 2 481169.3 5178296.0 -48.4 21.8 20-310
U-15-02 Loop 3 481169.3 5178296.0 -52.3 21.2 30-335 U-15-04 Loop 3 481169.3 5178296.0 -48.4 21.8 30-305 U-15-05 Loop 3 481318.9 5178264.5 -50.9 29.6 100-303
The following table shows the various time gates that constitute the channel configurations set up in the Crone PEM Receiver used in the surveys discussed in this report. The 16.66 ms timebase uses off-time channels 1 - 20, while the 50 ms timebase uses off-time channels 1 -24.
Table Ill: Channel Configuration 50 msec Channel Start Finish
pp -200 f.lS -100 f.lS
1 48 f.lS 64 f.lS
3 84 f.lS 112 f.lS
5 152 f.lS 204 f.lS
7 268 f.lS 360 f.lS
9 480 f.lS 640 f.lS
11 848 f.lS 1.128 ms 13 1.496 ms 1.992 ms 15 2.644 ms 3.512 ms 17 4.664 ms 6.192 ms 19 8.22 ms 10.92 ms ------------ ---------------------- ---------------------21 14.4 ms 17.7 ms 23 27.7 ms 37.7 ms
Channel
2 4 6 8
10 12 14 16 18 20 ------------22 24
Start Finish
64 f.lS 84 f.lS
112 f.lS 152 f.lS
204 f.lS 268 f.lS
360 f.lS 480 f.lS
640 f.lS 848 f.lS
1.128 ms 1.496 ms 1.992 ms 2.644 ms 3.512 ms 4.664 ms 6.192 ms 8.22 ms 10.92 ms 14.4 ms --------------------- ----------------------
17.7
37.7
ms 27.7 ms ms 47.7 ms
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Component Measured
X,Y,Z X,Y,Z X,Y,Z
X,Y,Z
X,Y,Z
X, Y,Z X,Y,Z X,Y,Z
Crone Geophysics & Exploration Ltd.
Table IV: Channel Confiyuration 16. 66msec Channel Start Finish Channel Start Finish
pp -200 1-!S -100 1-!S
1 48 1-!S 64 1-!S 2 64 1-!S 84 1-!S
3 84 1-!S 112 1-!S 4 112 1-!S 152 1-!S
5 152 1-!S 204 1-!S 6 204 1-lS 268 1-!S
7 268 1-lS 360 1-lS 8 360 1-lS 480 1-lS
9 480 1-lS 640 1-lS 10 640 1-lS 848 1-lS
11 848 1-lS 1.128 ms 12 1.128 ms 1.496 ms 13 1.496 ms 1.992 ms 14 1.992 ms 2.644 ms 15 2.644 ms 3.512 ms 16 3.512 ms 4.664 ms 17 4.664 ms 6.192 ms 18 6.192 ms 8.22 ms 19 8.22 ms 10.92 ms 20 10.92 ms 14.4 ms
---------------------------------- ---------------~----- ------------ --------------------- ----------------------
6.0 PRODUCTION SUMMARY
T, bl v p d s a e ro uctwn urn mary 23-Nov-2009 Mob Mississauga to Sudbury_ 24-Nov-2009 Laid loop 25-Nov-2009 Dummied all 4 holes 26-Nov-2009 Surveyed hole U-15-04 Z component 27 -Nov-2009 Surveyed hole U-15-03 ZYX and XY on 15-04 components- at
night as striking mine workers were preventing access during the day
28-Nov-2009 Surveyed hole U-15-01 -at night- mine strike 29-Nov-2009 Surveyed hole U-15-01 30-Nov-2009 Surveyed hole U-15-05 2-Dec-2009 Laid 4 sQ_ools on the 8x8 loop 3-Dec-2009 Laid 2 spools on the 8x8 loop. Gpsed and picked up 4x4.
Transferred gear to new site. 4-Dec-2009 Laid 2 loops on the 8x8 loop. Gpsed and picked up 4x4. Transferred
the rest of the gear to new site. 5-Dec-2009 Surveyed INCO hole 56550 6-Dec-2009 Surveyed Z component one hole U-15-04 7-Dec-2009 Finished job. Picked up loop and loaded wire and generator aboard
truck 13-Dec-2009 Laid 4 more spools Completing loop for borehole survey and 3 111 of
C loop 14-Dec-2009 Surveyed holes 02 and 04 with loop. GPSed loop and laid 1 spool to
complete C loop 15-Dec-2009 Surveyed hole 05 with loop 3
Geophysical Survey Report
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Crone Geophysics & Exploration Ltd.
Respectfully submitted,
Kevin Ralph Crone Geophysics & Exploration Ltd.
Geophysical Survey Report
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Crone Geophysics & Exploralion Ltd.
APPENDIX I
PLAN AND SECTION MAPS
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APPENDIX II
LINEAR (5-AXIS) PULSE EM DATA PROFILES
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APPENDIX III
PULSE EM DATA PROFILES (LIN-LOG SCALE)
Geophysical Survey Report
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APPENDIX IV
CRONE INSTRUMENT SPECIFICATIONS
Geophysical Survey Report
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SYSTEM DESCRIPTION
The Crone Pulse EM system is a time domain electromagnetic method (TDEM) that utilizes an alternating pulsed primary current with a controlled shut-off and measures the rate of decay of the induced secondary field across a series of time windows during the off-time. The system uses a transmit loop of any size or shape. A portable power source feeds a transmitter which provides a precise current waveform through the loop. The receiver apparatus is moved along surface lines or down boreholes.
The transmitter cycle consists of slowly increasing the current over a few milliseconds, a constant current, abrupt linear termination of the current, and finally zero current for a selected length of time in milliseconds. The EMF created by the shutting-off of the current induces eddy currents in nearby conductive material thus setting-up a secondary magnetic field. When the primary field is terminated, this magnetic field will decay with time. The amplitude of the secondary field and the decay rate are dependent on the quality and size of the conductor. The receiver, which is synchronized to the off-time of the transmitter, measures this transient magnetic field where it cuts the surface coil or borehole probe. These readings are across fixed time windows or "channels".
SYSTEM TERMINOLOGY
Ramp Time "Ramp time" refers to the controlled shut-off of the transmitter current. Three ramp times
are selectable by the operator; 0.5ms, l.Oms, and 1.5ms. By controlling the shut-off rather than having it depend on the loop size and current ensures that the same waveform is maintained for different loops so data can be properly compared.
The 1.5ms ramp is the normally used setting for good conductors. lt keeps the early channel responses on scale and decreases the chance of overload. The faster ramp times of l.Oms and 0.5ms will enhance the early time responses. This can be useful for weak conductors when data from the higher end of the frequency spectrum is desired.
Time Base Time base is the length of time the transmitter current is off (it includes the ramp time). This
also equals the on time of the current. Time bases are available for both 60Hz and 50Hz noise rejection respectively:
• 8.33ms (30Hz), 16.66ms (15Hz), 50ms (5Hz), lOOms (2.5Hz), 150ms (1.67Hz), 300ms (0.833Hz), 500ms (0.5Hz), 750ms (0.33Hz), lOOOms (0.25Hz)
• lOms (25Hz), 20ms (12.5Hz), 50ms (5Hz), lOOms (2.5Hz), 150ms (1.67Hz), 300ms (0.833Hz), 500ms (O.SHz), 750ms (0.33Hz), lOOOms (0.25Hz)
Since readings are taken during the off cycles, the time base will have an effect on the receiver channels. Normally, a standard time base is selected for the type of system and survey being used, but this can be changed to suit a particular situation. A longer time base is preferred for conductors of greater time constants, and in surveys such as resistive soundings where more channels are desired.
Zero Time Set The term "zero time set" or "ZTS" refers to the starting point for the receiver channel
measurements. lt is manually set on the receiver by the operator thus allowing adjustments for the ramp times and fine tuning for any fluctuations in the transmitter signal.
Receiver Channels The rate of decay of the secondary field is measured across fixed time windows which
occupy most of the off-time of the transmitter. These time windows are referred to as "channels". These channels are numbered in sequence with "1" being the earliest. The analog and datalogger receivers measured eight fixed channels. The digital receiver, being under software control, offers more flexibility in the channel positioning, channel width, and number of channels.
PP Channel The PEM system monitors the primary field by taking a measurement during the current
ramp and storing this information in a "PP channel". This means that data can be presented in either normalized or normalized formats, and additional information is available during interpretation. The PP channel data can provide useful diagnostic information and helps avoid critical errors in field polarity.
Synchronization Since the PEM system measures the secondary field in the absence of the primary field, the
receiver must be in "sync" with the transmitter to read during the off-time. There are three synchronization methods available: cable connection, radio telemetry, and crystal clock. This flexibility enhances the operational capabilities of the system.
SURVEY METHODS
The wide frequency spectrum of data produced by a Pulse EM survey can be used to provide structural geological information as well as the direct detection of conductive or conductive associated ore deposits. The various types of survey methods, from surface and borehole, have greatly improved the chances of success in deep exploration programs. There are eight basic profiling methods as well as a resistivity sounding mode.
Moving Coil A small, multi-turn transmitter loop (13.7m diameter) is moved for each reading while the
receiver remains a fixed distance away. This method is ideal for quick reconnaissance in areas of high background conductivity.
Moving Loop Same as Moving Coil method, but with a larger rectangular transmit loop (100 to 300
meters). This method provides deeper penetration in areas of high background conductivity, and works best for near-vertical conductors. This method can be used in conjunction with the Moving Inloop survey for increased sensitivity to horizontal conductors.
Moving In-Loop A rectangular transmit loop of size 100 to 300 meters is moved for each reading while the
receiver remains at the center of the loop. This method provides deep penetration in areas of very high background conductivity, and works best for near-horizontal conductors. It can be used in conjunction with the Moving Loop survey.
Large In-Loop A very large, stationary transmit loop (BOOm square or more) is used, and survey lines are
run inside the loop. This mode provides very deep penetration (700m or more) and couples best with shallow dip conductors ( <45 deg.) under the loop.
Deep EM A large, stationary transmit loop is used, and survey lines are run outside the loop. This mode
provides very deep penetration, and couples best with steeply dipping conductors (>45 deg.) outside the loop.
Borehole (Z Component only) Isolated Borehole: A drill hole is surveyed by lowering a probe down a hole and surveying it
with a number of transmit loops laid out on surface. The data from multiple loops gives directional information on the conductors.
Multiple Boreholes: One large transmit loop is used to survey a number of closely spaced holes. The change in anomaly from hole to hole provides directional information. These methods have detected conductors to depths of2500m from surface and up to 200m from the hole.
3-D Borehole Drill holes are surveyed with both the Z and the XY borehole probes. The X and Y
components provide accurate direction information using just one transmit loop. Since the probe rotates as it moves down the hole a correction is required for the X-Y data. This is accomplished in one of two ways. The measurement of the primary field from the "PP" channel can be used to apply a "cleaning" algorithm to remove most of the secondary field contamination, and compare this to theoretical values. The amount of probe rotation is then calculated, and the correction can be made. The second method involves the use of an optional orientation tool for the X-Y probe. This attachment uses dip meters to calculate the probe rotation. A third method uses another rotation tool with integrated 3-axis accelerometers and 3-axis magnetometers which can be used to correct rotation on steeply dipping holes including vertical.
Underground Borehole Underground drill holes can be surveyed in any of the above mentioned borehole methods
with one or more transmit loops on the surface. Near-horizontal holes can be surveyed using a pushrod system.
Resistivity Soundings By reading a large number of channels in the centre of a transmit loop it is possible to
perform a decay curve analysis giving a best-fit layer earth model using programs such as ARRTl or TEMIX.
EQUIPMENT
Transmit Loops The PEM system can operate with practically any size of transmit loop, from a multi-turn
circular loop 13.7m in diameter, to a 1 or 2 turn loop of any shape up to 1 or 2 kilometers square using standard insulated copper wire of 10 or 12 gauge. The multi-turn loop is made in two sections with screw connectors. The 10 or 12 gauge loop wire comes on spools in either 300m or 400m lengths. The spools can be mounted on pack frame wire winders for laying out or retrieving.
Power Supply The PEM system has been produced in 2 varieties: high power ( 4.8 KW), and low power (2.4
KW). The low power PEM system normally operates with an input voltage from 24V to 240V with a maximum output current of 20 amps. For very low power surveys a 20ampjhr 24V battery can be used. The high power system operates on a continuously variable voltage input up to 240V with a maximum output current of 30 amps. The power supply requires a motor generator and a voltage regulator to control and filter the input voltage to the transmitter.
Specifications: PEM Motor Generator • (2.4 KW) 4.5 hp Robin EH34 engine, 120V 3-phase alternator • ( 4.8 KW) 11 hp Robin RGV6100 240V j120V generator (1-phase) • cable output to regulator • fuse type overload protection • steel frame • external gas tank
• optional packframe for low-power generator • wooden shipping box • unit weight: 33kg (2.4 KW); 81kg ( 4.8 KW) • shipping weight: 4 7kg (2.4 KW); 100kg ( 4.8 KW)
Specifications: PEM Variable Voltage Regulator • High Power
• Continuously variable voltage output up to 240V • 30 amp maximum current • Integrated sealed aluminum case ruggedized for shipping • Shipping weight 18kg
• Low Power • selectable voltage between 24v and 120v • 20amp maximum current • anodize d aluminum case • padded wooden shipping box • unit weight 10kg; shipping weight 18kg
• fuse and internal circuit breaker protection • cable connections to motor generator and transmitter
Specifications: PEM Transmitter • High Power
• Timebases • 8.33ms (30Hz), 10ms (25Hz), 16.66ms (15Hz), 20ms, (12.5Hz), 50ms (5Hz), lOOms
(2.5Hz), 150ms (1.67Hz), 300ms (0.833Hz), 500ms (0.5Hz), 750ms (0.33Hz), 1000ms (0.25Hz)
• ramp times: O.Sms, l.Oms, l.Sms • operating voltage: continuously variable input up to 240V • output current up to 30amp maximum • optional current control feedback system features constant current output with ±0.1 amp
precision • integrated sealed aluminum case ruggedized for shipping with shock protection
• Low Power • Timebases
• 8.33ms (30Hz), 10ms (25Hz), 16.66ms (15Hz), 20ms, (12.5Hz), 50ms (5Hz), lOOms (2.5Hz), 150ms (1.67Hz), 300ms (0.833Hz)
• operating voltage: 24v to 120v • output current: 5amp to 20amp • anodized aluminum case • optional pack frame • unit weight 12.5kg; shipping weight 22kg • padded wooden shipping box
• monitors for input voltage, output current, shut-off ramp, tx loop continuity, instrument temperature, and overload output current
• automatic shut-off for open loop, high instrument temperature, and overload • fuse and circuit breaker overload protection • three sync modes:
• built-in radio and antenna • cable sync output for direct wire link to receiver or remote radio • crystal clock connection with built-in optical isolation
Receiver The receiver measures the rate of decay of the secondary field across several time channels.
The Crone Digital Receiver, in use since 1987 uses software control, offering a variety of programmable channel configurations.
Specifications: Digital PEM Receiver • 26 bit (156d8) dynamic range • operating temperature -40°C to 50°C • built-in non-volatile memory • optional pack frame • unit weight 15kg; shipping weight 25.5kg • padded wooden shipping box • Menu driven operating software system offering the following functions:
• controls channel positions, channel widths, and number of channels • Timebases: 8.33ms (30Hz), lOms (25Hz), 16.66ms (15Hz), 20ms, (12.5Hz), 50ms (5Hz),
lOOms (2.5Hz), 150ms (1.67Hz), 300ms (0.833Hz), 500ms (0.5Hz), 750ms (0.33Hz), lOOOms (0.25Hz)
• ramp time selectable • sample stacking from 1 to 65536 • automatic gain and spike rejection • scrolling routines for viewing data • graphic display of decay curve and profile with various plotting options • routines for memory management • control of data transmission • provides information on instrument and operating status
Sync Equipment There are three modes of synchronization available; radio, cable, and crystal clock. The radio
sync signal can be transmitted through a booster antenna from either the PEM Transmitter internal radio or through a Remote Radio.
Specifications: Sync Cable • 2 conductor, 24awg, Teflon coated • approx. 900m per aluminum spool with connectors
Specifications: Remote Radio • operating frequency 27.12mhz • 12V rechargeable gel cell battery supply • fuse protection • sync wire link to transmitter • coaxial link to booster antenna • anodized aluminum case • unit weight 2.7kg
Specifications: Booster Antenna o 8m, 4 section aluminum mast • guide rope support • %wave CB fiberglass antenna • range up to 2km • coaxial connection to transmitter or remote radio
Specification: Crystal Clocks • heat stabilized crystals • 24V rechargeable gel cell battery supply
• anodized aluminum case • rx unit can be separate or housed in the receiver • outlet for external supplementary battery supply
Surface PEM Receive Coil The Surface PEM Receive Coil picks up the EM field to be measured by the receiver. The coil
is mounted on a tripod that can be positioned to take readings of any component of the field.
Specifications: Surface PEM Receive Coil • ferrite core antenna • VLF filter • 10khz bandwidth • two 9v transistor battery supply • tripod adjustable to all planes • unit weight 4.5kg; shipping weight 13.5kg • padded wooden shipping box
Surface SQUID sensor CSlRO 1-,2- or 3- axis high-sensitivity superconducting sensor measures magnetic field in the sub-pT
range.
Specifications: Surface SQUID sensor • liquid nitrogen cooled, 12 hour operation between reservoir refills • low-noise floor -350fT /VHz • man-portable sensor and control system • moving loop, or large loop survey configuration • solid teflon non-magnetic housing • operational temperature range: -40°C to 40°C • total system packaged shipping weight (without liquid nitrogen): 62kg
Borehole PEM Z Component Probe The Z component probe measures the axial component of the EM field. The Z component
data is not affected by probe rotation so no correction is required.
Specifications: Borehole PEM Z Component Probe • ferrite core • dimensions: length- 1.6m; dia- 3.02cm (3.15cm for high pressure tested probes) • internal rechargeable NiCd battery supply • replaceable heat shrink tubing for abrasion protection • pressure tested for depths 1300m, 2000m, and 2800m • packaged in padded cover and aluminum tube • shipped in padded wooden box; total weight 17kg
Borehole PEM XV Component Probe The XY probe measures two orthogonal components of the EM field perpendicular to the
axis of the hole. Correction for probe rotation can be achieved by mathematical theoretical primary field reduction or more commonly with an attached orientation tool sensor.
Specifications: Borehole PEM XV Component Probe • ferrite core • dimensions: length- 2.01m; dia- 3.02cm • internal rechargeable ni-cad battery supply
• selection of X or Y coils by means of a switch box on surface or automatic switching with Digital receiver
• replaceable heat shrink tubing for abrasion protection • pressure tested for depths to 2800m • packaged in padded cover and aluminum tube • shipped in padded wooden box; total shipping weight 20kg
Specifications: Orientation Tool • 2 axis tilt sensors • accuracy± 0.1 deg. • operating range -88 to -10 deg. • dimensions: length- 0.94m; dia- 28.Smm • packaged in padded cover and aluminum tube • shipped in padded wooden box; total shipping weight 14kg
Specifications: Rotation Angle Direction (RAD) Tool • integrated 3-axis accelerometers and 3-axis magnetometers • dip and roll accuracy: ±0.5°, azimuth accuracy: ±1.0° • operating range: all • simultaneous 3D magnetometer borehole survey by station • optional continuous logging mode • dual 3-axis sensors provide an alternative complete borehole Dip-Azimuth measurement • dimensions: length- 0.75m; dia- 31.8mm • packaged in padded cover and aluminum tube • shipped in padded wooden box; total shipping weight 14kg • NiCd battery provides ali-day operation
• Length- 0.93m; dia- 28.6mm • Packaged in padded cover and aluminum tube • Shipped in padded wooden box; total shipping weight 14kg
Borehole Equipment To lower the probe down a drill hole requires a cable and spool, winch assembly frame and
cable counter. Borehole surveys also require equipment to "dummy probe" the hole before doing the survey.
Specifications: Borehole Cable • two conductor shielded cable • kevlar strengthened • lengths are available up to 2600m on three sizes of spools • shipped in wooden box
Specifications: Slip Ring • attaches to side of borehole cable spool providing a connection to the receiver while allowing the
spool to turn. • VLF filter • pure silver contacts
Specifications: Borehole Winch Frame • welded aluminum frame • removable axle • chain driven, 3 speed gear box • hand or optional power winding • hand brake and lock
• optional chain-gear safety cover • two sizes: standard for up to 1300m cable; large for longer cables • shipped in wooden box
Specifications: Borehole Counter • attaches to the drill hole casing • calibrated in meters • shipped in wooden box; total weight 13kg
Specifications: Dummy Probe and Cable • solid steel or steel pipe • same dimensions as borehole probe • shear pin connection to dummy cable • steel dummy cable on aluminum spool • cable mounts on borehole frame • various lengths to 2600m on 3 spool sizes.
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Notes on the Crone Geophysics, Borehole Geophysical Surveying November and December 2009
Brief discussion with respect to the locations of the geophysical plates detected by: Crone Geophysics, during their borehole surveying efforts on the Ursa Major Minerals Incorporated, Nickel Offset Mine Option Property, in Foy Township, Ontario.
The Blue plate, corresponding with the in hole response for diamond drill hole, Kevin has modeled the center of the plate at: 0481237 E and 5178433N = 431 meters west (1413.68 feet) and 55 meters north (180.4 feet) of the Nickel Offset No. shaft.
The vertical projection of the location plots 14 meters +/- ( 45 feet) east of the trace of DDH U-15-02. The location can also be pin pointed at 125 meters north (410 feet) and 75 meters east (245 feet) from the collar of DDH U-15-02.
Kevin Ralph has indicated that the center top of plate at 217 meters (712 feet+/-) vertically below the surface, which on section plots 50 meters ( 165 feet) vertically below the 21 0 meters mark in DDH U-15-02.
The massive sulphide mineralization in DDH U-15-02 is located at 250 meters down the hole. If as per the location information from Kevin Ralph, the center of the blue plate would be located at 30 meters distance from the massive sulphide intersection. Connecting up the two points gives a bit of an odd, shallow like apparent dip I plunge, seems to be inclined at about 35 degrees towards the foot wall of the dyke. This is generally contrary to the plunge of the main lenses in the mine, but may have a similar attitude as has been suggested for the No. 5 Lens located on the 1550 West Level.
It is actually interesting that the blue plate plots just below DDH U-15-03 near a large area of diabase - glomeroporphyritic diabase. It may be conceivable that a south east plunging zone of mineralization may have passed just above the diabase interval cut in DDH U-15-03, and would be out of view in that hole. Likewise may also be the same with respect to the location of the red plate.
The Red plate, corresponding with the off hole response form DDH U-15-04, Kevin Ralph has modeled the center of the plate at 0481249 E and 5178445 N = 419 meters west (1374.3 feet) and 55 meters north (180.4 feet) from the Nickel Offset No. 1 shaft.
The vertical projection of the location plots 26 meters+/- (85 feet) east of the trace of DDH U-15-04. The location can also be pin pointed at 125 meters (41 0 feet) north and 88 meters (290 feet) east of the collar of DDH U-15-04.
Kevin Ralph has indicated that the center to of plate is located at 239 meters vertically (785 feet +/-)below the surface, which on section plots 95 meters (312 feet) vertically below the 195 meter mark in DDH U-15-04.
On plan the vertical projections of the points would seem to indicate that if the two responses were connected, then the strike between the two points would be 092 degrees Az.
Harold J. Tracanelli, Getn, P.Geo Ursa Major Minerals Incorporated