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  • longwall
    Published On: March 13, 2025

    Join Dr. Ian Gray at Longwall 2025 – A Must-See Presentation on Rock Stress and Failure in Longwall Mining

    Sigra is proud to announce that Dr. Ian Gray, a globally recognised expert in geomechanics and underground mining, will be [...]

    Read More
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Sigra is a privately owned company founded in 1994. It is based in Brisbane, Australia, and operates globally. Sigra is involved in all matters to do with the ground.

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    Sigra provides the experienced field personnel with the capability to conduct the standard exploration drilling supervision and analysis in conjunction with the geotechnical aspects essential to mine design and specific mining related problems.

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  • Geotechnical Engineering & Geomechanics
    Geotechnical Engineering & Geomechanics
    Rock
    • Rock Properties Testing
      • Uniaxial Testing
      • Shear Testing
      • Tensile Testing
      • Triaxial Testing
      • Hydrostatic Testing
      • Index Testing
      • Geophysical Comparisons
      • Other Tests
    • Stress Measurement in Rock
      • In-Situ Stress Testing By Overcoring – 2D
      • In-Situ Stress Testing By Overcoring – 3D
      • Hydrofracture
      • Hydrojacking
      • Core Ovality
      • Borehole Breakout
      • Surface Stress Measurement
      • Stress Change Monitoring
      • Tectonic Strain
    Coal & Shales
    • Coal Properties Testing
      • Coal Structure
      • Carbonate Content – Matrix & Fracture
      • Coal Shrinkage with Desorption
      • Proximate & Moisture Analysis
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      • Injection Fall Off Testing & Falling Head Testing
      • Interference Testing – Well Test with Piezometers
      • Pulsed DST Testing
      • Diagnostic Fracture Injection Testing – DFIT
      • Permeability Testing from Underground
      • Core Permeability
    • Pressure Measurement
      • Piezometers
    • Stress-Related Permeability
    Gassy Rocks – Coals and Shales
    • Gas Content Measurement
      • Gas Content From Core Desorption
      • Gas Content Without Coring
      • Gas Content From Cuttings
    • Gas Sorption Isotherms – Gas Storage
      • Isotherms by Regassing
      • Native Sorption Isotherms
    • Diffusional Behaviour
      • Diffusion from Cuttings
      • Apparent Diffusion Coefficient from Core
    • Stress & Permeability Changes – Stress Path
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    Sigra has a long involvement with drilling in many forms throughout its existence. This comes from having to work with whatever is available wherever that may be to the development of drilling systems. This range of involvement includes:

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