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7 results for “acid mine drainage” in Industry
Industry · 7 August 2026
After the Cyanide
Every ounce of mined gold leaves behind roughly a tonne of processed rock and the water that carried it. What happens to that material after the last shift is the part of the industry with the longest time…
Tomas Herrera · 16 min read
Industry · 6 August 2026
The Scrap Trade
…a quarter to a third of annual gold demand, and its volume responds to price faster than mine output can. · Scrap is priced off spot, adjusted for assayed fineness, then discounted for testing, refining, transport and each intermediary's margin. · High-street payouts commonly la…
Ingrid Sørensen · 16 min read
Industry · 28 July 2026
Urban Mining: The Richest Gold Ore on Earth Is in Your Old Phone
…y richer than gold ore? By concentration, frequently yes. Modern underground ore is often mined at grades measured in single-digit grams of gold per tonne, while sorted, high-grade circuit boards can run into the hundreds of grams per tonne. What e-waste lacks is a deposit: the m…
Tomas Herrera · 16 min read
Industry · 2 July 2026
Nine Nines: Inside a Modern Gold Refinery
…bars trade without re-assay in the wholesale market. · Provenance documentation now determines a bar's marketability as much as its fineness. · Recycled scrap is a large and often more profitable feedstock than mined doré, but it demands heavier sorting and compliance work befor…
Tomas Herrera · 19 min read
Industry · 20 August 2026
The Refiner's Ledger
Somewhere between a mine's doré bar and a Good Delivery brick sits a chain of chlorination furnaces, electrolytic cells, assay labs and accreditation committees that decides which gold the world's markets will…
Tomas Herrera · 17 min read
Industry · 4 August 2026
The Gold Inside Your Phone
…ties, yes: a tonne of scrap circuit boards contains far more gold than a tonne of typical mined ore. At household scale it is not economic and the informal chemical methods used to attempt it are genuinely dangerous. · Does a higher gold price reduce electronics demand? Barely, i…
Tomas Herrera · 18 min read
Industry · 7 August 2026
How Fake Gold Is Detected
…obvious density mismatches — but it cannot detect a well-made tungsten-cored bar, because acid streak tests and simple electronic testers only sample the surface. A home kit is a useful first filter, not a substitute for an ultrasonic or assay-based check on any high-value purcha…
Tomas Herrera · 16 min read
