Search
Search the whole magazine.
Full-text search across every article — headlines, decks, body copy, pull quotes, captions and FAQs — plus our editorial and legal policies.
3 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 · 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 · 20 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
