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2 results for “Urban mining” in Mining
Mining · 22 May 2026
The Other Supply Chain: Artisanal Mining and the Mercury Problem
…ation is the stated solution. Nobody agrees on what it costs. · Artisanal and small-scale mining employs millions and is the largest source of anthropogenic mercury emissions. · Mercury amalgamation persists because it is cheap, fast and requires no capital or literacy in chemist…
Amara Okonjo · 12 min read
Mining · 5 August 2026
Grade, Cut-off and the Arithmetic of an Open Pit
…for turning grade into cash flow at an acceptable cost per tonne. To understand why gold mining behaves as it does through a price cycle, you have to understand the arithmetic that sits underneath the machinery. · Grams per tonne, and what that means physically · Gold grade is q…
Amara Okonjo · 16 min read
