The Institute of Quarrying recently sat down with Dr R Neil Humphries to discuss his latest publication, Soil Resource Considerations – Part 1: Identification. This insightful conversation explores the motivations behind his three-part guide, the challenges and opportunities in soil resource management, and the critical role soils play in quarry restoration, biodiversity, and sustainable land development.
What inspired you to develop this three-part guide on soil resource considerations for the mineral extraction industry?
There has been a sea-change in how soils should now be considered in land development, and this needs to be addressed by the minerals industry.
Why do you believe soil identification has historically been overlooked in mineral development planning, and what are the consequences of that?
Previously, planning policy focused on conserving the most productive and versatile agricultural soils, while overlooking the wider importance of all soils for their ecosystem services.
How does the Soil Resource and Management Plan (SRMP) improve outcomes for quarry restoration and environmental stewardship?
The SRMP provides an accessible, single reference source for all soil survey, recovery, replacement, and aftercare information, incorporating any changes made. It informs those involved throughout the life cycle of land development, resulting in better restoration and stewardship outcomes.
Can you explain the importance of distinguishing between natural and manufactured soils in restoration projects?
The functioning and ecosystem services of naturally derived soils and naturally occurring soil-making materials are likely to be more predictable and require less intervention than manufactured soils.
What are the biggest challenges in conducting accurate soil surveys on mineral sites, and how can these be overcome?
There are three main challenges: These are getting acceptance that the soils specialist is involved early in the planning process (at the scheme inception and design stages), acceptance that there is to be a complete resurvey following replacement at the completion of the mandatory ‘restoration condition’ stage, and acceptance of resurveys during aftercare period.
How do soil characteristics influence the success of Biodiversity Net Gain and nature recovery schemes?
Soil profile physical and chemical characteristics, and the resulting ecosystem functioning, determine the type, composition, and sustainability of terrestrial habitats. Therefore, achieving Biodiversity Net Gain and nature recovery schemes depends on matching specific soil characteristics and ecosystem functioning.
In your view, what role should planning authorities play in enforcing soil conservation and management standards?
Engagement with planning authorities throughout the development life cycle is essential for achieving intended outcomes and facilitating flexibility where needed. The SRMP plays an important role in informing and recording this process.
How can the industry address the current shortage of soil specialists, and what opportunities exist for professional development?
The minerals industry could sponsor bespoke training courses and raise its profile with educational providers offering soil and earth science courses. Existing CPD opportunities include British Society of Soil Science conferences and training courses. There is also scope for forming an Extractive Industry Soils (EIS) group, similar to the successful mineral geologists’ EIG.
What innovations or technologies do you see shaping the future of soil resource management in quarrying?
Two key innovations stand out:
Moving from 2-D mapping to 3-D terrain mapping of in situ and replaced soil resources, alongside geomorphologic and catchment modelling of ecosystem services. Establishing a national evidence base of practices and outcomes.
What advice would you give to young professionals entering the field of soil science within the extractive industries?
Seek as much mentoring as possible from experienced practitioners, whether in-house or external. Field experience is essential—take every opportunity to explore different in situ and replaced soils, and observe soil handling operations.
Dr Humphries’ work highlights the growing importance of soil resource management in delivering sustainable quarry restoration and supporting biodiversity goals. His three-part guide provides practical tools and insights for professionals across the minerals industry.
To learn more about Soil Resource Considerations – Part 1: Identification and access guidance documents, visit www.quarrying.org/soils-guidance