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2 results for “Miller process” in Mining
Mining · 5 August 2026
Grade, Cut-off and the Arithmetic of an Open Pit
…grade? The lowest grade at which a tonne of rock generates more revenue than it costs to process. Rock above it is ore and goes to the mill; rock below it is waste and goes to the dump. Because the calculation depends on the gold price, energy costs and recovery rate, the bounda…
Amara Okonjo · 16 min read
Mining · 22 May 2026
The Other Supply Chain: Artisanal Mining and the Mercury Problem
…a heavy concentrate so that gold can be melted out directly. It removes mercury from the process entirely and uses a material available in any hardware market. · It also demands a higher-grade concentrate than panning typically produces, which means it must be paired with improv…
Amara Okonjo · 12 min read
