Ground Penetrating Radar (GPR)
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1 Ground Penetrating Radar (GPR) In the search for uraniferous paleo-channels Klaus P. Knupp Uranium Conference October 2009, Swakopmund, Namibia
2 Some GPR Principles Source: Sensors & Software Inc. GPR Signal is sensitive to changes in: electrical conductivity σ dielectric permittivity ε (magnetic permeability μ)
3 GPR Survey Principles Source: Sensors & Software Inc.
4 GPR: Factors to consider Direct Air Wave System Ring down Direct Air Wave Response Source: Sensors & Software Inc. Radar Velocity Calcrete Sources of Noise
5 GPR Survey: Antennas
6 GPR Survey: Antennas Dune Survey
7 GPR Survey: Antennas 25 MHz 50 MHz 100 MHz 200 MHz
8 GPR Survey: Antennas for Paleo-channel work 25 MHz Production Rate: 3.5 km/day 12.5 MHz
9 GPR Survey: Namibian Case Studies Trekkopje Langer Heinrich Tumas EPL 3516
10 EPL Pitchstone Exploration Ltd. Terrain: Gypcrete & Calcrete GPR - Acknowledgements: Pitchstone Exploration Ltd.
11 EPL Pitchstone Exploration Ltd. S Pitchstone Exploration Ltd. Horizontal Loop Electromagnetic (HLEM) Test Survey: 50 m coil spacing Line CD - EPL /8/2009 C D N Terrain: Gypcrete & Calcrete DN09-25 DN09-26 DN09-27 DN09-28 HLEM + bedrock Figure 6 Acknowledgements: Pitchstone Exploration Ltd.
12 GPR Survey: Namibian Case Studies Trekkopje Langer Heinrich Tumas EPL 3516
13 Trekkopje Mine Terrain: Gypcrete & Calcrete Acknowledgements: Areva Resources Namibia
14 Trekkopje Mine Trekkopje paleo-channel Terrain: Gypcrete & Calcrete GPR - Acknowledgements: Areva Resources Namibia
15 Trekkopje Mine UranMin (Namibia) Pty Ltd SE Horizontal Loop Electromagnetic (HLEM) Test Survey: 50m coil spacing Line CD - Klein Trekkopje 3/9/2009 C KTPC n Trekkopje paleo-channel 8KTH0062 KTRC 1415 KTRC 0125 KTPC D NW Terrain: Gypcrete & Calcrete HLEM + bedrock Figure 5 Acknowledgements: Areva Resources Namibia
16 GPR Survey: Namibian Case Studies Trekkopje Langer Heinrich Tumas EPL 3516
17 Tumas Project Line Terrain: 1A T u m a s 1B Line 2 Calcrete & Alluvium R i v e r 2A Tumas paleo-channel 2B Locality Map Kilometers Earthmaps Consulting May 2008 WGS84 UTM33S Reptile Uranium Namibia (Pty) Ltd Ground Penetrating Radar Test Survey Legend GPR Test Line 1A-1B GPR Test Line 2A-2B GPR Test Line AB GPR Test Line CD Acknowledgements: Reptile Uranium Namibia (Pty) Ltd
18 Tumas Project Tumas paleo-channel Terrain: Calcrete Paleo-channel GPR + Acknowledgements: Reptile Uranium Namibia (Pty) Ltd
19 Tumas Project Line 2 Tumas paleo-channel Terrain: Calcrete Paleo-channel GPR + Acknowledgements: Reptile Uranium Namibia (Pty) Ltd
20 Tumas Project Line 1 T u m a s 1A 1B Line Terrain: Active River Drainage R i v e r 2A Tumas paleo-channel 2B Locality Map Kilometers Earthmaps Consulting May 2008 WGS84 UTM33S Reptile Uranium Namibia (Pty) Ltd Ground Penetrating Radar Test Survey Legend GPR Test Line 1A-1B GPR Test Line 2A-2B GPR Test Line AB GPR Test Line CD Acknowledgements: Reptile Uranium Namibia (Pty) Ltd
21 Tumas Project Line 1 - S Tumas active drainage Terrain: Active River Drainage GPR + Acknowledgements: Reptile Uranium Namibia (Pty) Ltd
22 Tumas Project Line 1 - N Tumas active drainage Terrain: Active River Drainage GPR + Acknowledgements: Reptile Uranium Namibia (Pty) Ltd
23 GPR Survey: Namibian Case Studies Trekkopje Langer Heinrich Tumas EPL 3516
24 Langer Heinrich Mine Langer Heinrich Mine Terrain: Calcrete & Alluvium Acknowledgements: Langer Heinrich Uranium (Pty) Ltd
25 Langer Heinrich Mine Traverse 1 Langer Heinrich paleo-channel Terrain: Calcrete & Alluvium GPR + - Acknowledgements: Langer Heinrich Uranium (Pty) Ltd
26 Langer Heinrich Mine Traverse 1 Terrain: Langer Heinrich paleo-channel Calcrete & Alluvium HLEM + - faulted bedrock Acknowledgements: Langer Heinrich Uranium (Pty) Ltd
27 Langer Heinrich Mine Langer Heinrich Mine Terrain: Calcrete & Alluvium Acknowledgements: Langer Heinrich Uranium (Pty) Ltd
28 Langer Heinrich Mine Traverse 2 Langer Heinrich paleo-channel Terrain: Calcrete & Alluvium GPR + Acknowledgements: Langer Heinrich Uranium (Pty) Ltd
29 Langer Heinrich Mine Traverse 2 Terrain: Langer Heinrich paleo-channel Calcrete & Alluvium HLEM - Acknowledgements: Langer Heinrich Uranium (Pty) Ltd
30 GPR & HLEM: Comparison Colour Key: Good resolution & penetration Poor resolution & poor penetration Environment Calcrete, Alluvium >10 ohm.m Gypcrete, Calcrete < 10 ohm. m GPR (12.5 MHz) +-2m depth resolution down to m +- 2 m depth resolution down to m HLEM (50m coil) +- 4 m depth resolution to m provided resistivity not > 30 ohm.m +- 4 m depth resolution to m provided resistivity not < 1 ohm.m
31 GPR & HLEM: Comparison GPR HLEM Not effective EPL 3516 Trekkopje Effective Langer Heinrich (Tumas) Resistivity: ohm.m
32 GPR Survey: Namibian Case Study: Results Trekkopje GPR penetration: m in cypcretes GPR penetration: m in calcretised alluvium Langer Heinrich Tumas EPL 3516 Where you penetrate the resolution is hard to beat.
33 GPR: Other Applications Groundwater Table Acknowledgements: Swakop Uranium (Pty) Ltd
34 sea beach GPR: Other Applications Omaruru River Salt Water Vs. Fresh Water Saline water fresh water Interface (Omaruru River Mouth) Acknowledgements: Sam Nujoma Marine and Coastal Research Centre
35 GPR: Other Applications Pipe Pipe Pipe Pipe Acknowledgements: Knight Piesold (Pty) Ltd
36 GPR: Other Applications Diamondiferous Gravels in Kasai & Longatshimo Rivers (DRC) Acknowledgements: Gem Diamonds Mining Company of Africa
37 GPR: Other Applications Diamondiferous Gravels in Kasai & Longatshimo Rivers (DRC) Acknowledgements: Gem Diamonds Mining Company of Africa
38 GPR: Other Applications Diamondiferous Gravels in Kasai & Longatshimo Rivers (DRC) Gravel bars Acknowledgements: Gem Diamonds Mining Company of Africa
39 GPR: Other Applications K a s a i R i v e r Gravel bars Acknowledgements: Gem Diamonds Mining Company of Africa
40 GPR: Other Applications Diamondiferous Gravels in Kasai & Longatshimo Rivers (DRC) Gravel bar Acknowledgements: Gem Diamonds Mining Company of Africa
41 GPR: Other Applications Boulders Diamondiferous Gravels in Kasai & Longatshimo Rivers Gravel bars (DRC) Acknowledgements: Gem Diamonds Mining Company of Africa
42 Thank You
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