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NAD offers an unprecedented combination of services that provides turnkey ground construction solutions in both rural and urban conditions.

NAD's advanced ground stabilization resources, world-renowned drilling expertise and specialized equipment are all proficiently coordinated by an experienced team of SDI engineers. Customers are provided with 100% accountability throughout each phase, risks are minimized, and projects are completed on time and on budget.


  • DCIM101MEDIA
    Civil Solutions

    Access / Egress
    Ventilation – Intake / Exhaust
    Drop / Surge
    Utilities
    Foundation Elements

Mining Services Brochure
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  • Mining_Front_Right_1
    Mining Solutions

    Access / Egress
    Ventilation – Intake / Exhaust
    Utilities
    Exploration / Bulk Sample

Mining Services Brochure
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  • 1
    International Solutions

    Access / Egress
    Ventilation – Intake / Exhaust
    Utilities
    Exploration / Bulk Sample
    Foundation Elements

International Services Brochure
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NAD provides the global market with shafts approaching 20' (6m) in diameter and 2000' (600m) deep.

This unrivaled expertise is used to meet the growing demands for larger diameter ventilation and access shafts for sewer systems, tunnels, infrastructure, and raw water intake. Our shafts are used by our clients to provide underground operations with the shortest possible route for utilities, such as electrical power, pneumatics (air) and communications.

Ground stabilization for shaft development is self-performed by SDI's extensive geo-technical company. Analysis, design and execution for our clients site-specific task are performed in house and in real time.



Our team has more than 30 years of experience in mine shaft development to meet the requirements and schedules of technically difficult projects, such as those involving multiple types of strata (ranging from soft to hard) or extreme depth.

  • Ventilation
  • De-watering Systems for Underground Mines
  • Conduits for Utilities
  • Emergency Egress

NAD delivers optimum efficiencies and the greatest alleviation of risk to our clients.

  • Rock grouting and compaction grouting expertise allows greater access to the rock formation through unconsolidated materials.
  • Shaft development is performed ahead and independent of any underground work keeping projects isolated from underground operations.
  • Fully developed shafts are lined according to application and material efficiencies. Final liners available in steel, concrete or composite materials.
  • On site equipment and expertise to expedite site prep
NAD's unprecedented combination of resources can reduce the need for multiple contractors resulting in significant savings in time and cost for our clients.

Contact our team today and let's discuss how we will overcome your project's unique challenges.