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6 results for “9 carat vs 18 carat” in Industry
Industry · 7 August 2026
How Fake Gold Is Detected
…st takes under a minute and costs a fraction of an assay. · 19.32 / 19.25 Density of gold vs tungsten (g/cm³) 3,240 / 5,180 Sound velocity, gold vs tungsten (m/s) ~30 µm Practical XRF sampling depth in gold ±0.01 mm Dimensional tolerance a modern mint holds · Coins are a differen…
Tomas Herrera · 15 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 · 15 min read
Industry · 2 July 2026
Nine Nines: Inside a Modern Gold Refinery
…mid sparks · Stage one: the Miller process · Francis Bowyer Miller patented his method in 1867, and it is still how most of the world's gold takes its first serious step towards purity. Molten doré is held at around 1,100°C and chlorine gas is bubbled through it via a ceramic lan…
Tomas Herrera · 12 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 · 17 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 · 15 min read
Industry · 28 July 2026
Urban Mining: The Richest Gold Ore on Earth Is in Your Old Phone
A tonne of good underground ore holds a few grams of gold. A tonne of discarded circuit boards can hold two hundred. So why is most of it still going into landfill? · Concentration, not tonnage, is wh…
Tomas Herrera · 13 min read
