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3 results for “Ore grade” in Mining
Mining · 5 August 2026
Grade, Cut-off and the Arithmetic of an Open Pit
…is a spreadsheet with a hole attached — and the single number that decides which rock is ore and which rock is waste moves every time the price does. · Modern open-pit gold ore is typically around one to two grams per tonne — roughly a gold ring's worth of metal in a truckload o…
Amara Okonjo · 20 min read
Mining · 19 August 2026
Nine Grams a Tonne
…actually cost to pull an ounce of gold out of the ground? The honest answer runs through grade decline, energy and water bills, permitting delays and the closure liabilities nobody prices until the mine is already exhausted. · The industry's headline cost figure, all-in sustaini…
Amara Okonjo · 18 min read
Mining · 22 May 2026
The Other Supply Chain: Artisanal Mining and the Mercury Problem
…-digit to low double-digit percentage of annual mined supply, while employing many times more people than the industrial mining industry. · Are there mercury-free alternatives for small-scale miners? Yes. Gravity concentration with sluices, shaking tables and centrifuges, sometim…
Amara Okonjo · 15 min read
