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2 results for “Cut-off grade” 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 · 16 min read
Mining · 22 May 2026
The Other Supply Chain: Artisanal Mining and the Mercury Problem
…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 improved gravity separation to work. As a package the two are strong; as an isolated substitution it dis…
Amara Okonjo · 12 min read
