A gold and copper mine in Longyan, China, has shown that its own waste can become the road beneath its heaviest vehicles. According to ‘ Sustainable valorisation of mine-derived solid wastes into cementitious pavement materials: Mechanical performance and microstructural insights ,’ researchers mixed blasting slag, neutralised dreg and a binder made from steel slag, waste cement and lime slag, all taken from the Zijinshan Gold-Copper Mine, then laid test roads that carried 100-ton trucks. After 28 days, the best mixture resisted deformation better than rock, soil and plain blasting slag, and it met groundwater limits for three toxic metals. This article explains how the mixture works, what the field tests found, and what limits remain, using a recent study. By turning material that once sat in storage into a surface built to carry the heaviest loads, the mine points toward a future where haul roads are built from the leftovers of the work they support.
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