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3 results for “cut-off grade explained” in Mining
Mining · 5 August 2026
Grade, Cut-off and the Arithmetic of an Open Pit
…e to two grams per tonne — roughly a gold ring's worth of metal in a truckload of rock. · Cut-off grade is a price-dependent accounting decision, not a geological fact: a higher gold price literally converts waste into ore. · Strip ratio — waste tonnes moved per ore tonne — is of…
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
…egetation is slow to recover, leaving agricultural and fishing communities dealing with degraded land and contaminated water long after the miners have moved to the next site. · The pit is four metres deep and shored with cut branches. Two men work at the bottom filling rice sack…
Amara Okonjo · 15 min read
