Which survey measures how well rocks conduct electricity to locate kimberlite?

Which survey measures how well rocks conduct electricity to locate kimberlite?

• A. Seismic survey
• B. Electromagnetic survey
• C. Geochemical testing
• D. Indicator minerals

Answer: (B)

Measuring how well rocks conduct electricity is the job of an electromagnetic survey. By introducing an electromagnetic field into the ground and recording how rocks respond, you map subsurface conductivity. Kimberlite pipes often have fluids, clays, graphite, or sulfides that make the surrounding rock more conductive, producing a distinctive anomaly that helps pinpoint the pipe. Other methods don’t focus on conductivity: seismic surveys study how fast and with what attenuation seismic waves travel to reveal stiffness and density, geochemical testing analyzes element concentrations in sampled rocks, and indicator minerals rely on minerals that suggest kimberlite presence but don’t directly measure electrical properties. So electromagnetic surveying is the best fit for locating kimberlite through conductivity.

Measuring how well rocks conduct electricity is the job of an electromagnetic survey. By introducing an electromagnetic field into the ground and recording how rocks respond, you map subsurface conductivity. Kimberlite pipes often have fluids, clays, graphite, or sulfides that make the surrounding rock more conductive, producing a distinctive anomaly that helps pinpoint the pipe. Other methods don’t focus on conductivity: seismic surveys study how fast and with what attenuation seismic waves travel to reveal stiffness and density, geochemical testing analyzes element concentrations in sampled rocks, and indicator minerals rely on minerals that suggest kimberlite presence but don’t directly measure electrical properties. So electromagnetic surveying is the best fit for locating kimberlite through conductivity.