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ClearView Geophysics Inc

12 Twisted Oak Street
Brampton, Ontario L6R1T1
Tel: (905) 458-1883

ClearView Geophysics Inc. specializes in the application of ground-based geophysical surveys for environmental, geotechnical and mineral exploration. Our business is centred on the ability to operate various geophysical instruments in sometimes rugged and difficult field conditions. The acquired data are subsequently processed/plotted and interpreted to guide follow-up intrusive investigations.

Two instruments demonstrated: Geonics EM31 Ground Conductivity Meter and Scintrex EnviC Cesium Magnetometer.


The Geonics EM31 Ground Conductivity Meter is built and serviced by Geonics Limited based in Mississauga, Ontario. It a one-person operated instrument that has two poles extending from the control box. The total length is approximately 4 metres long. The data recorded are apparent conductivity (quadrature) and in-phase. The instrument can be run in the standard vertical dipoles mode which has a penetration depth of approximately 6 metres with most of the response coming from below ~2 metres. The less commonly used horizontal dipoles mode has a penetration depth of approximately 3 metres with most of the response coming from near surface. The apparent conductivity and inphase components are plotted as separate maps that can be post-processed to accentuate subtle features caused by former foundations, pipes/utilities, limits of fill, contaminant plumes, settling pond leaks and so forth. The inphase component is more sensitive to metal and therefore is useful for detecting buried metal. An experienced geophysicist can often interpret the source based on the character of the coincident apparent conductivity and inphase response. ClearView carries out EM31 surveys in streaming 10x/second mode by combining the system with a DAP logger and AgGPS132 receiver. This allows for rapid positioning, plotting and interpretation while still in the field.

The Scintrex EnviC Cesium Magnetometer is a relatively new instrument introduced last year by Scintrex of Concord, Ontario. It is a follow-up system to the NavMag cesium magnetometer. The system is run using a DAP logger (a Quebec based company) running navigation and acquisition software written by Scintrex. The cesium sensor is one of the fastest magnetic sensors commercially available. It is standard for airborne geophysical surveys. ClearView routinely uses cesium magnetometers for snowmobile-mode and walking-mode surveys in the arctic, where diurnal variations and magnetic gradients can be very high. ClearView uses GEM Systems Overhauser magnetometers as base stations. All systems are synchronized to UTC time. Cesium magnetometers are excellent for detecting buried metal, with or without a base station. The base station is necessary to remove diurnal variations caused by solar activity so that subtle buried objects and structures can be more accurately detected and mapped.

We will demonstrate how these two instruments are applied in the field and display data that was collected that morning from the demonstration site
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