The Terraquest XDS VLF System Discussion of the 3-Component Passive by uoy21072

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									  The Terraquest XDS VLF System:
Discussion of the 3-Component Passive
  VLF EM System and Case Studies

      Peter Walker, Geophysical Algorithms
    Jeremy S. Brett, MPH Consulting Limited
Platforms



 Airborne Platforms:
   Navajo, King Air, Cessna
   Radiometrics 2000 Cu in, 8 down 1 up
   Horizontal T.F. Magnetic Gradiometer
   XDS/VLF-EM
   Digital Camera
XDS/VLF How is it different?
   What is XDS/VLF-EM?
   What is it good for?
   What about directional dependence?
   How deep can it measure?
   Why three-components?
   How does it respond to?:
          Massive Sulphides
          Kimberlites
          Gold
          Uranium
VLF Spectrum
Summary:
Benefits of the XDS/VLF-EM System

   Cost effective regional EM mapping tool
   Fault mapping / confirmation
   Confirms geological trends
   Confirms magnetic mapping
   Useful in prioritizing uranium occurrences
Case Studies
 Bonny Fault Project, NE Alberta
  North American Gem Inc.
 Athabasca Basin Project, NE Alberta
  Strathmore Minerals Corp.
 Fire Eye Project, Athabasca Basin, NW Saskatchewan
  (Purepoint Uranium)
 Matoush Project, Otish Basin, Quebec
  Strateco Resources
 Mikwam Project, Casa Berardi Area, Ontario
  ESO Uranium
 Eagle 1 Project, Ring of Fire Area, NW Ontario
  Noront Resources
Case Study #1 Bonny Fault Project, NE Alberta
  Digital
 Terrain
Model with
 peak eU
anomalies
   Total
Magnetic
 Intensity
   with
 peak eU
anomalies
    Total
 Horizontal
 Derivative
with Peak eU
 anomalies
  XDS-VLF
   ORTHO
 Component
with peak eU
 anomalies
  XDS-VLF
    LINE
 Component
with peak eU
 anomalies
TMI / XDS /
   eU
anomalies
    XDS
Interpreted
 Structures
  with eU
 anomalies
#3 Purepoint Uranium, Athabasca Basin
 Survey
  Area,
Athabasca
  Basin
Survey
 Area
(zoom)
  Total
Magnetic
Intensity
Reconstructed
    Total
    Field
   (RTF)
   RTF
   TILT
DERIVATIVE
XDS-VLF
  Ortho
Component
XDS-VLF
   Line
Component
XDS-VLF
 Vertical
Component
XDS-VLF
 Vertical
Component
 045pass
  Filter
XDS-VLF
   Line
Component
 045pass
  Filter
   Case Study #4
 Matoush Project,
Strateco Resources
    Otish Basin,
      Quebec
Residual
 Total
 Field

  TILT
Derivative
 XDS-VLF
  VERT
   and
   LINE
Components
  VERT
  TILT
Derivative

  LINE
  TILT
Derivative
VERT (negative)
with Resistivity
  Colour Bar

 AQL Impulse
   Apparent
  Resisitvity
    4650Hz
#5 Mikwam Gold Project, ESO, NW Ontario
Geology
TMI with Casa Berardi Trend
TILT Derivative with Casa Berardi Trend
XDS-VLF ORTHO COMPONENT
XDS-VLF ORTHO (070 Pass)
XDS-VLF ORTHO (070 Pass 120 Reject)
TMI with Casa Berardi Trend and Splay?
#6 Noront, Ring of Fire Area, NW Ontario
Residual Total
    Field




                 TILT Derivative
XDS-VLF ORTHO




                XDS-VLF LINE
XDS-VLF LINE
045 Pass Filt




                XDS-VLF LINE
                045 Pass Filt
SIG: Analytic Signal of the TMI, created using the actual measured horizontal

magnetic gradients - It emphasizes discrete bodies
TILT - Tilt Derivative of the TMI, created using the actual measured horizontal

magnetic gradients - it emphasizes linear features
THD - Total Horizontal Derivative of the TMI, created using the actual measured
horizontal magnetic gradients! (Superior to the THD calculated from the TMI)

The THD emphasizes magnetically inferred contacts
Comparison of Airborne and Ground VLF:
  Line coil          Line TILT           Ground
Summary:
Benefits of the XDS/VLF-EM System

 Cost effective near-surface regional EM
  mapping tool
 Inferred fault mapping
 Reinforces known geological trends
 XDS is supported by magnetically inferred
  trends
 Assists with magnetic interpretations
 Useful in prioritizing mineral targets by
  potentially identifying controlling structures
Credits
   North American Gem Inc. Charles Desjardin, President
   Strathmore Minerals Corp. Patrick Groening, CFO
   Dahrouge Geological Services. Jody Dahrouge
   Purepoint Uranium, Roger Watson
   Strateco Resources, Jean-Pierre Lachance
   ESO Uranium, Ben Ainsworth
   Noront Resources, Jim Atkinson
   Northern Superior Resources, Tom Morris
   Geophysical Algorithms, Dr. Peter Walker, Geophysicist
   MPH Consulting Ltd., Jeremy S. Brett, Geophysicist
   Terraquest Ltd, Paul Wessler, Director of Technology
A Commitment to Excellence in Airborne Geophysics

								
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