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.
7 results for “9 carat vs 18 carat” in Industry
Industry · 7 August 2026
How Fake Gold Is Detected
…tungsten-cored bar is a rare, deliberate, high-value fraud; a batch of jewellery stamped 18-karat that actually assays at 15 or 16 is quiet, distributed across thousands of pieces, and usually only discovered when the item is later sold and independently assayed. · Does hallmark…
Tomas Herrera · 16 min read
Industry · 2 July 2026
Nine Nines: Inside a Modern Gold Refinery
…ce work before it ever reaches the furnace. · The metallurgy has barely changed since the 1870s; what has changed is the containment engineering, financial controls and paperwork built around it. · What is a doré bar? A doré bar is the semi-pure alloy poured at a mine site, typic…
Tomas Herrera · 19 min read
Industry · 6 August 2026
The Scrap Trade
…ld? Work out the contained gold first: weight in grams multiplied by fineness — 0.750 for 18k, 0.585 for 14k, 0.375 for 9k — multiplied by the spot price per gram. That is the theoretical maximum. What you are offered is a percentage of it, and the percentage varies enormously be…
Ingrid Sørensen · 16 min read
Industry · 7 August 2026
After the Cyanide
…roblem one: the reagent · Cyanide leaching has been the industry's core process since the 1890s, and its persistence is a matter of arithmetic rather than affection. Gold is chemically stubborn; very few reagents will dissolve it at all, and fewer still will do so without also di…
Tomas Herrera · 16 min read
Industry · 20 August 2026
The Refiner's Ledger
…according to how pure the final product needs to be. The Miller process, developed in the 1860s and still in wide industrial use, bubbles chlorine gas through the molten doré; base metals react with the chlorine and are drawn off as chlorides, leaving behind gold at roughly 995 p…
Tomas Herrera · 17 min read
Industry · 28 July 2026
Urban Mining: The Richest Gold Ore on Earth Is in Your Old Phone
…evices, per kilogram Lower Typical life-cycle emissions per gram, formal e-waste recovery vs primary mining Reversed That comparison's direction once informal, unpermitted recovery is substituted
Tomas Herrera · 16 min read
Industry · 4 August 2026
The Gold Inside Your Phone
Industrial demand is the quietest third of the gold market: a few tenths of a gram per handset, multiplied by billions of devices, chosen not for prestige but because nothing else conducts as reliably…
Tomas Herrera · 18 min read
