Leadgate, Consett – Coal Mining Risk Assessment and Ground Investigation

CLIENT REQUIREMENTS & CHALLENGES

Identifying and mitigating risks from abandoned coal and ironstone seams

• Historic coal mining and ironstone extraction beneath the site.

• Potential shallow seams posing settlement or collapse risks.

• Requirement to comply with Coal Authority regulations before development.

• Need for a cost-effective investigation strategy without compromising safety.

• Complex ground conditions typical of the Durham Coalfield.

OUR APPROACH & METHODOLOGY

From desk-based risk assessment to targeted ground investigation

1. Desk Study: Reviewed historical maps, geological records, and mine abandonment plans to identify seam depth and thickness.

2. Ground Profiling: Created detailed 2D and 3D models of subsurface conditions.

3. Investigation Design: Leveraged local geological expertise to focus on high-risk areas, optimising scope and cost.

4. Intrusive Works: Carried out rotary boreholes and probing to target shallow seams identified in the desk-based phase.

5. Risk Assessment: Analysed field data alongside mine plans to evaluate residual risks.

6. Regulatory Engagement: Worked with the Coal Authority to verify findings and ensure compliance.

RESULTS & DELIVERABLES

Confirmed safe development potential with minimal risk of mining-related instability

• Verified that underlying coal and ironstone seams posed a very low risk to the planned development.

• Delivered a comprehensive Coal Mining Risk Assessment for planning and regulatory approval.

• Provided geological data to support safe foundation and structural design.

• Achieved cost savings for the client through a targeted, efficient investigation approach.