What was developed or tested
The study measured substrate chemistry, microbial communities, germination and biomass in both acid-producing and neutral-to-alkaline tailings.
What the evidence supports
A circular rehabilitation concept combining regional residual streams. Controlled work supports biological feasibility; field hydrology and long-term geochemistry remain unresolved.
Environmental and technical uncertainty
Organic amendments improved nutrient status and raised pH in acid tailings, but field persistence, supply and contaminant uptake require verification.
Benefit-case screening lens
Potential value: Closure and rehabilitation outcomes, reduced erosion or exposure, improved land use and possible avoidance of imported rehabilitation materials.
Deployment constraints: Long-term geochemistry, soil function, vegetation performance, water quality, monitoring duration and whether treatment changes the underlying liability.
Question before applying elsewhere
Will the amended material sustain vegetation while controlling erosion, pore-water quality and contaminant exposure over the required timeframe?