Coal Mining Risk Assessment

Requirement of a Coal Mining Risk Assessment

In the UK’s quest to unlock more land for housing, we are frequently confronted by the ghosts of our industrial past. A Coal Mining Risk Assessment (CMRA) is not just a bureaucratic hurdle; it is a statutory requirement and a critical safeguard for any new developments located within high-risk areas shaped by a historical coal mining legacy.

For local authorities, housing associations and private developers, this document is the foundation of site viability. By identifying specific coal mining risks relating to past coal mining activity early, a CMRA ensures regulatory compliance, protects capital investment, guards against other safety risks and provides a clear roadmap for mitigating ground instability, gas migration and subsidence.

What is a Coal Mining Risk Assessment?

A CMRA is a specialist technical report that makes a thorough evaluation of the potential hazards associated with historic coal mining activity on or near a proposed development site.

Because abandoned mine workings often lead to unpredictable ground stability, this ground investigation is essential for determining the historical legacy, structural integrity and safety of the land.

The geological insights provided assist both developers and planning authorities in deciding whether specific engineering operations and interventions are required to deal with coal mining issues before construction begins on new developments.

When is a Coal Mining Risk Assessment Report Required?

A Coal Mining Risk Assessment is usually mandated during the planning process, particularly for sites within designated Coal Mining Reporting Areas or a development high-risk area. Understanding when to trigger this assessment can be the difference between a smooth approval and a costly delay.

1. Applications for Planning Consent

Local Planning Authorities (LPAs) generally require a CMRA for developments in a high-risk area with mining-related issues. A report prepared by a competent person ensures that hazards are addressed upfront, leading to a more rapid discharge of planning conditions.

2. Structural Safety and Stability

Developers must account for abandoned mine entries, tunnels and shallow workings when designing foundations. The assessment provides the data needed to determine whether a scheme is commercially viable or requires specialised engineering solutions to make the ground safe and stable.

3. Public Health and Mine Gas

Old workings can be conduits for hazardous ground gas, such as methane and carbon dioxide. A CMRA evaluates the risk of these gases migrating into new structures, protecting future occupants from fire, explosion or asphyxiation risks.

4. Due Diligence and Transactions

For investors and institutions purchasing land, a CMRA is a vital component of due diligence. It identifies potential liabilities and “unbuildable” zones on or near a site location before a transaction is finalised.

Coal Mining Risk Assessment Exemptions

Specific exemptions are in place, preventing developers from referring to a coal mining risk assessment if it simply isn’t needed. For instance, a full CMRA may not be necessary if the site is outside of a development high-risk area or if there are no potential sources of mine gas or unstable ground.

It could even be that a full assessment on a development high-risk area is unnecessary, but this can only be confirmed by the local council. For this to happen, a desk-based CMRA would need to be carried out, with the regulatory information from the desk-based study and assessment of coal authority records confirming that no further surveys are needed.

Key Hazards of Former Mining Activities

The legacy of the Coal Authority’s historic workings presents several distinct physical and environmental risks:

• Ground Subsidence: Underground shallow workings can collapse over time. This leads to surface subsidence and unstable ground that can catastrophically damage buildings, utilities and road infrastructure.

• Mine Shaft Hazards: Abandoned shafts and mine entries that were improperly sealed present a significant collapse danger and subsidence risks.

• Gas Emissions: Disused mines often harbour pockets of pressurised gas. Gas monitoring, proper ventilation and specialised gas membranes are frequently recommended to ensure site safety.

• Water Ingress: Mining often alters natural groundwater movement. This can result in localised flooding or unexpected water pressure in excavations and basements.

• Contaminated Land: Residues from coal mining, including heavy metals, hydrocarbons and sulphates, can contaminate soil and groundwater, requiring remediation before a site is deemed safe for residential use.

Coal Mining Risk Assessment Guidance

Our coal mining risk assessment guidance covers every consideration needed to meet the requirements of the local authorities.

The Assessment Process

A robust Coal Mining Risk Assessment is typically conducted in phases by experienced geo-environmental consultants.

Phase 1: Desk-Based Assessment

The desk-based study identifies a range of issues: it involves a coal mining risk assessment consultant conducting an exhaustive review of historical and geological data, including:

• Coal Authority records and abandonment plans.

• Historical maps and geological survey records.

• Identifying shallow coal seams and known mine shafts.

• Identifying potential sources of ground gas.

Phase 2: Intrusive Site Investigation

If the desk-based assessment identifies potential risks, a site walkover and intrusive investigation is required. This is a more detailed investigation than the desk-based CMRA and often involves:

• Borehole Drilling: Extracting samples to determine exact ground conditions.

• Geotechnical Testing: Evaluating ground stability, soil strength and the potential for subsidence.

• Ground Gas and Groundwater Monitoring: Measuring methane levels and assessing water ingress risks.

Phase 3: Mitigation Measures and Reporting

Once the data is analysed, the consultant proposes specific mitigation strategies. These may include engineering operations such as ground reinforcement (such as grouting or piling), shaft capping, or the installation of gas venting systems. The final coal mining risk assessment report is then submitted to the LPA to satisfy statutory consultees and secure planning permission.

Use an Experienced Coal Mining Risk Assessment Consultant

Navigating the complexities of the Coal Authority’s legacy requires professional expertise and consideration of all regulatory information, whether within a development low-risk area or a high-risk part of the country.

Acquiring the geological information about a site where former coal mining activities have taken place, and the potential risks posed, will assist developers with risk mitigation strategies when it comes to planning applications for a development project.

By engaging geo-environmental consultants with experience of providing comprehensive Coal Mining Risk Assessments across the UK, you give yourself the best chance of avoiding costly surprises and achieving a successful, safe development scheme.

Early intervention and a risk-based approach is key, giving you time to assess commercial advice. Conducting a CMRA at the start of your planning application journey ensures that your development proposals remain viable, compliant, and above all, safe for the community.

Our Coal Mining Risk Assessment Consultant Team

Throughout every step of the process, our team will offer support and advice on any concerns you have about your development site and any overlap between your plans and the risks caused by nearby historical mines.

We remain involved with clients from start to finish and won’t rest until planning permission has been confirmed. Every member of our team has the qualifications, experience and skills to evaluate your site, and we’ve seen every possible issue that would otherwise prevent planning acceptance.

Coal Mining Risk Assessment Cost

It’s perfectly understandable that before you reach out for an inspection, you ask about coal mining risk assessment cost. One of the factors we pride ourselves on is our insistence on keeping our prices competitive, fair and easy to logically justify to clients.

Part of what affects the price of a coal mining risk assessment report is the level of service needed, with certain development sites needing complete assessments and others only requiring the desk study phase. Our quotes always start with a baseline cost, and from there, we only add on what we need to based on the scale of the project.

Booking a Coal Mining Risk Assessment for Planning Application Purposes

You may need a desk study by itself or a full coal mining risk assessment with the ground investigation involved. Whatever the size and purpose of development proposals, we are equipped to provide coal mining risk assessments to clients all over the country and offer commercial advice to architects, developers and landowners.

As soon as the inspection has been concluded, the coal mining risk assessment consultant will put together a coal mining report directly covering risk factors, and we will continue to support you with any other coal mining risk assessment services you need. Request a free quote by emailing us, calling us or visiting our contact page and speaking with our team.