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.
2 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 · 16 min read
Mining · 22 May 2026
The Other Supply Chain: Artisanal Mining and the Mercury Problem
…d where feasible eliminate mercury use in the sector. · The pit is four metres deep and shored with cut branches. Two men work at the bottom filling rice sacks with grey sediment; a third hauls them up on a rope. At the river's edge, a fourth swirls the contents of a shallow stee…
Amara Okonjo · 12 min read
