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3 results for “Tailings” in Mining
Mining · 19 August 2026
Nine Grams a Tonne
…is required to close the pit or underground workings, remove or stabilise waste rock and tailings, treat any residual water contamination, and rehabilitate the surface, funded by a closure bond posted before mining even begins. In practice, closure costs are frequently underesti…
Amara Okonjo · 18 min read
Mining · 22 May 2026
The Other Supply Chain: Artisanal Mining and the Mercury Problem
…oles that carry their own distinct mercury exposure. · Land degradation and mercury-laden tailings often outlast the mining itself, affecting agriculture and fisheries for years after a site is abandoned. · What is artisanal and small-scale gold mining? ASGM refers to mining carr…
Amara Okonjo · 15 min read
Mining · 5 August 2026
Grade, Cut-off and the Arithmetic of an Open Pit
…That number is the entire business. Everything else at a mine — the fleet, the mill, the tailings facility, the workforce, the community agreement, the closure bond — is machinery for turning grade into cash flow at an acceptable cost per tonne. To understand why gold mining beh…
Amara Okonjo · 20 min read
