Spectral IP and Resistivity

Spectral Induced Polarization & Resistivity surveys (IP & Res) are excellent methods for detecting disseminated sulphide mineralization that could be associated with gold. The surveys are carried out using surface and borehole modes.

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Large Loop TDEM

ClearView Geophysics Inc. owns and operates transient PROTEM receivers and TEM57/67 transmitters built by Geonics. This system has proven itself useful for detecting both good and bad conductor sulphide mineralization located both shallow and 100’s of metres deep.  It is also useful for detecting sources of water.

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Snowmobile-Mode Cesium Magnetics

Cesium magnetometer surveys are carried out using a custom-built sleigh pulled behind a standard snowmobile.  This system has proven itself on numerous large-scale mineral exploration projects during the past 15+ years. 

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Seismic Refraction

Seismic Refraction surveys are typically carried out for depth to bedrock investigations.  The "shot" can be either an explosive or hammer source.  Interpex IXRefraX software is used to process the data.

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Electromagnetic (EM) and Magnetic surveys

EM and Magnetic surveys are perhaps the most common geophysical methods used on mineral exploration and environmental investigations. The most commonly used EM instruments for environmental investigations are the Geonics EM31 and EM61.

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GPR ( Ground Penetrating Radar )

GPR works best in low conductivity areas. Conductive materials (e.g., clay) attenuate the GPR signal to the point that very little depth penetration is achieved. Penetration is greatest in unsaturated sands and fine gravels.

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Gravity

Gravity surveys are completed for a number or applications, including mineral exploration (e.g., diamonds) and geotechnical investigations (e.g., escarpments).

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Geophysical Interpretation

ClearView has extensive experience interpreting airborne and ground-based geophysical data. We use UBC's suite of inversion software to produce 2D and 3D interpretations of total field magnetics and IP/Resistivity data. Post-processing software is also used to produce various derivative datasets and maps.  

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Methods

Within the specialty of geophysics, there are a number of geophysical methods that can be applied to obtain solutions for your project.  In some cases, it is beneficial to apply more than one method for complementary information.

A few examples of situations where complementary methods are recommended and carried out by ClearView:

Environmental Investigations:

Where buried metal is the main target, ClearView typically has on-hand an EM61 metal detector, a Noggin250 GPR system, AND a Metrotech Pipe & Cable Locator system.  For larger areas (>1 hectare), an EM31 is also made available.  The EM61 and/or EM31 survey is carried out and viewed on the field computer.  GPR and Metrotech instruments are then used to follow-up questionable EM anomalies to provide additional interpretive information about their potential sources.  GPR is also necessary in areas with excessive surface metal interference, or where concrete containing rebar "masks" objects that could be located underneath.  The Metrotech instrument can be used to test vent and fill pipes, if available.

Depth to Bedrock and Water Exploration:

Bedrock interfaces and overlying soils can make it difficult to measure depth's to bedrock with a single geophysical method.  That is why methods are sometimes combined depending on site conditions.  For wide open areas with predominanly sandy soils, seismic refraction and GPR are good methods to apply.  For more confined areas and mixed soils, an EM31 and TDEM sounding survey is useful to map the lateral variations in soils and detection of faults and alteration zones within the bedrock respectively.  Micro-Gravity is another method that ClearView has successfully applied to locate escarpments and lateral variations in bedrock topogaphy.  Gravity works best over flat terrain and vibration-quiet areas, although it was completed successfuly in a city environment when done at night when traffic was minimal.

Base metal exploration:

Magnetics and gravity data can help guide both broad and detailed TDEM surface and borehole surveys carried out by ClearView.  In large scale arctic setttings ClearView develops UBC Mag3D inversion models of ClearView's high resolution snowmobile-mode cesium magnetics data.  These models along with the help of MultiLoop III, are used to design follow-up TDEM surveys.  ClearView can carry out all aspects of your Base metal exploration geophysics program: from design to implementation, modeling to presentation, interpretation to reporting...and continuing follow-up. 

Diamond exploration:

Ground magnetometer, electromagnetic, resistivity, GPR and gravity surveys (e.g., Snowmobile-Mode Cesium Mag / MaxMin / EM34 / Syscal / Ohm-Mapper / PulseEkko/Noggin / CG5 etc.) can be utilized to prioritize the large number of airborne magnetic and EM anomalies that are deemed favourable kimberlite targets.  Electromagnetic, resistivity, or GPR anomalies that correlate with magnetic anomalies are higher priority for drill testing compared to anomalies with no correlation. 

Gold exploration:

A magnetometer AND Spectral IP & Resistivity survey carried out by ClearView is typically recommended.  An anomaly with short spectral Tau, high spectral MIP, low resistivity and a magnetic low could result from fine grained sulphides within an alteration zone.  In some environments, this could represent ideal conditions for gold.  In environments where sulphides are more scattered throughout the various gold bearing and non-gold bearing rock types, borehole IP data can more directly correlate detection log results to assays, structure and % sulphides to develop a signature that can be applied on a broader scale.  ClearView compiles the geological and geophysics data to get the most information possible. 

ClearView can recommend the best geophysical solution for your project based on years of field tested experience.  Note that as more data are acquired from follow-up surveys, ClearView routinely compiles data from previous surveys and reinterprets the results with the newly incorporated data.

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