APPLYING THE SCIENCE OF GEOPHYSICS

We bring a broad range of experience to your project specializing in permafrost, hydro-geophysics, aggregate exploration, oil sands, and geological hazard identification. 

ENVIRONMENTAL

Environmental geophysics is one of DMT Geosciences' core areas of expertise. We have extensive experience collecting and interpreting environmental data. We work closely with our clients to integrate soil and water chemistry data with our geophysical data to provide a more thorough interpretation.

DMT has developed an alternative approach to environmental geophysics called Rapid Conductivity Volume (RCV). With this method we provide a pseudo 3-D image of the subsurface contaminants. With a more sophisticated approach and a team of Professional Geophysicists, DMT strives to provide our clients with data that has advantages over traditional EM methods.

The advantage of DMT's approach:

  • Improved volume estimates of salt impacted areas
  • Volume estimates of clean overburden
  • Increased accuracy and depth information
  • Significant cost savings during the 'dig and dump' stage of remediation

Applications:

  • Contaminant delineation
  • Groundwater detection and monitoring
  • Soil type analysis
  • Borehole logging
  • Muskeg mapping
  • Permafrost mapping
  • Void detection (Karst and erosion)
  • Landfill delineation and monitoring
  • Bedrock mapping
  • Aggregate detection and mapping
  • Buried utilities (pipelines and UST)

 

CASE STUDIES:

RCV PROJECT FOR VOLUMETRIC ANALYSIS OF SALT IMPACT

Location: Southern Alberta

Objective: delineating impacted zone of high TDS spill for improved efficiency in remediation.

PERMAFROST & ICE THICKNESS

DMT Geosciences has extensive experience working in Northern environments. There are unique challenges working in the north including the presence of presence of permafrost and muskeg. With the warming climate such studies are increasingly relevant. Geophysics provides non-invasive method to investigate in environmentally sensitive areas where drilling and other methods may lead to permafrost degradation.

Applications:

  • Permafrost mapping
  • Muskeg depth
  • Variations in ice content
  • Permafrost thickness
  • Active layer thickness
  • Monitoring permafrost degradation
  • Depth to bedrock
  • Granular depostis
  • Delineation of taliks


CASE STUDIES:

PERMAFROST MAPPING FOR DYKE EXPANSION PROJECT

LOCATION: Northwest Territories, Canada

OBJECTIVES: Identifying variations in ice content, soil type, permafrost extent, depth to bedrock, and taliks.     

RISK MANAGEMENT: MAPPING PERMAFROST AND SINKHOLES ALONG THE DEMPSTER AND CAMPBELL HIGHWAYS

LOCATION: Yukon, Canada

OBJECTIVES: Identify sinkholes, ice-rich permafrost and underlying factors contributing to permafrost
degradation and sinkhole development.

 

WATER-BORNE GEOPHYSICS

Bodies of water present a challenging environment to acquire data for site characterization.  At DMT, we provide a broad range of water-borne geophysical surveys that help to provide information where other forms of data acquisition are limited.  Surveys are customized to ensure that they meet the specific needs of the projects.

Applications:

  • Marine seismic reflection – depth to bedrock, sediment layers
  • Marine seismic refraction – seismic velocities for estimating geotechnical parameters
  • Sidescan sonar – water-bottom hazards, and archeological
  • Bathymetry – dredging, bridge scour, and erosion
  • Marine electrical resistivity – distribution of clays and sands


CASE STUDIES:

SURVEY TO MAP SEDIMENT AND BEDROCK FOR CIVIL ENGINEERING PROJECT

Location: Lillooet Lake, BC 

Objectives: Map the bedrock surface and layering in the water-bottom sediments.

MARINE SURVEY FOR HAZARD MAPPING

Location: False Creek, BC

Objectives: Map the location of hazards at the bottom of False Creek.  

UTILITY & TRANSPORTATION CORRIDORS

DMT specializes in geophysical solutions for transportation corridor design and monitoring including roads, railways, power lines and pipelines. Typical geophysical methods used are: Ground penetrating radar, DC-resistivity, electromagnetics and refraction/reflection seismic each providing different rock and soil properties and depths of investigation.

Carefully designed and collected multi-method geophysical surveys can be used to measure the thickness of sediments above bedrock and to provide detailed fault mapping and stratigraphic information. It is also possible to differentiate fractured, weathered low RQD bedrock from competent bedrock and in some case differentiate certain rock types. Typical geophysical methods used are: Ground penetrating radar, DC-resistivity, electromagnetics and refraction/reflection seismic each providing different rock properties and depths of investigation.

In combination with strategically placed boreholes, geophysical methods offer a more continuous view of the subsurface than boreholes alone, with little or no environmental impact.
Electrical, electromagnetic, ground penetrating radar and refraction/reflection seismic methods are used in specific combinations to map rock properties at the required depths along HDD crossings.
Interpretive cross sections are provided showing the distribution of sand, gravel and boulder horizons, identifying aquifers and infilled collapse features as well as profiling the bedrock surface, within the limitations of geophysical investigation.

Applications:

  • River crossing geotechnical engineering
  • Muskeg mapping/Buoyancy control
  • Bedrock depth, rippability
  • Permafrost delineation
  • Availability of borrow resources
  • Monitoring and environmental mapping
  • Directionally drilled water crossings
     

CASE STUDIES:

RESISTIVITY FOR AGGREGATE DELINEATION                                                                 

LOCATION: Central Alberta

OBJECTIVES: to delineate a gravel deposit and prospect for further resources in the lease area.                                               
Central Alberta Aggregate Study

GPR FOR PIPELINE BUOYANCY CONTROL

LOCATION: Northeastern Alberta

OBJECTIVES: To reduce costs in the design, procurement and construction of a pipeline through delination of muskeg depths.
An Integrated Approach to Pipeline Buoyancy Control

 

HYDROGEOPHYSICS

DMT Geosciences specializes in geophysical investigations for groundwater using data from ground and airborne geophysical methods including: EM, resistivity/IP, seismic, magnetics, and gravity gradiometry.

Applications:

  • Paleochannel Mapping
  • Mine inundation mitigation
  • Saline water mapping
  • Vadose zone studies
  • Environmental and contamination studies
  • Groundwater in bedrock structure, fractures and basal water sands


CASE STUDIES:

GROUNDWATER INVESTIGATION - MAPPING PALEO-CHANNELS IN NORTHERN ALBERTA

LOCATION: North-East Alberta, Athabasca Oil Sands

OBJECTIVES: Using multiple geophysical methods to study incised valley systems, inter-till paleochannels, deep saline aquifers and bedrock structure for regional groundwater exploration, Devonian geoscience studies, mine inundation risk analysis and protection of potable water supplies.

MINE DEVELOPMENT

DMT has extensive experience in mining and mine development geophysics, with a specialisation in the support of risk management regarding structures such as tailings dams and studies for environmental impact.

Surveys have been conducted in environments ranging from the jungles of Africa to the high Andes in Peru, and from the Canadian Arctic to the South Pacific. DMT Geosciences has employed nearly every geophysical method available to address a wide variety of mine related project objectives. DMT as an organization is dedicated to providing thorough and professional analysis, advice, data acquisition and results to maximize the effectiveness of geophysics in engineering projects to minimize risk posed by geological hazards.

Because our expertise spans a wide range of geophysical methods and we have experience with these methods in a variety of geological settings, we can bring unique solutions to complicated problems using carefully designed and collected multi-method geophysical surveys.

Applications:

  • In-Seam Coal Mapping
  • Oil Sands Deposit Mapping and Hazard Identification
  • Aggregate and Sand Mapping
  • Laterite and Bauxite Exploration
  • Alluvial Gold and Diamond Exploration
  • Permafrost studies
  • Water inundation hazards
  • Depth to bedrock
  • Soil and bedrock characterisation


CASE STUDIES:  Please click project name for for more details

MOUNT POLLEY REVIEW

LOCATION: Mount Polley Mine, Canada

OBJECTIVES: Evaluate the use of geophysics in tailings dam construction. DMT was consulted as an expert on geophysics during the Mount Polley Independent Expert Engineering Investigation and Review Panel at the recommendation of Panel Chair Dr. Norbert Morgenstern, P.Eng

 

GEOTECHNICAL RISK ASSESSMENT

DMT Geosciences has extensive experience in geophysical investigations for geotechnical engineering applications using surface and borehole geophysical methods.

We offer many types of geotechnical testing for site investigations. Our engineers cover groundwater surveys, analyses of rock and soil conditions, feasibility studies and consulting for your geotechnical project. We combine several geotechnical testing methods to be able to gather complimentary data to deliver an analysis suitable for your needs.

Applications:

  • Rippability and pre-excavation studies
  • Pipeline ROW
  • Road bed/bridge deck/pavement studies
  • Determination of dynamic soil properties/downhole seismic testing
  • Soil resistivity measurements/grounding design
  • Geophysical borehole logging in vertical and deviated holes
  • Granular deposits
  • Delineation of taliks 


CASE STUDIES:

 

FLOOD MITIGATION FEASIBILITY STUDY IN THE HIGHWOOD RIVER BASIN

LOCATION: High River, Alberta

OBJECTIVES: Using a combination of seismic and ground resistivity surveys to identify and measure the thickness of coarse-grained sediments and determine the depth to bedrock.

DYRGAS GATE SINKHOLE MITIGATION                                                

LOCATION: Canmore, Alberta                                                                   

OBJECTIVES: Locate an airshaft from abandoned coal workings causing the sinkhole to form.

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