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3 results for “Wohlwill 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 · 20 min read
Mining · 19 August 2026
Nine Grams a Tonne
…es now sit close to one gram per tonne, meaning roughly a tonne of rock must be moved and processed for every wedding ring's worth of metal. · Energy typically accounts for a fifth to a third of a mine's operating cost, and diesel price swings move margins more than most miners'…
Amara Okonjo · 18 min read
Mining · 22 May 2026
The Other Supply Chain: Artisanal Mining and the Mercury Problem
…ir price. · Women make up a substantial share of the artisanal workforce, concentrated in processing roles that carry their own distinct mercury exposure. · Land degradation and mercury-laden tailings often outlast the mining itself, affecting agriculture and fisheries for years…
Amara Okonjo · 15 min read
