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6 results for “surface plasmon resonance” in Industry
Industry · 7 August 2026
How Fake Gold Is Detected
…s. · XRF is fast, non-destructive and reads only the outer tens of microns — it validates surface composition, never the interior. · Ultrasonic velocity testing is the standard front-line defence against core-filled bars, because sound travels through tungsten far faster than thr…
Tomas Herrera · 15 min read
Industry · 4 August 2026
The Gold Inside Your Phone
…nding on the model and generation, spread across connector plating, printed-circuit-board surface finish, and the fine wires or bumps connecting silicon dies to their packages. At typical prices that is a few dollars of metal — negligible per unit, substantial across a billion un…
Tomas Herrera · 15 min read
Industry · 6 August 2026
The Scrap Trade
…gold; specialist refiners buying in volume pay far closer to it. · Handheld XRF reads the surface only, which is why plated and filled items are caught by density checks, file tests or a destructive assay. · Recycled gold is chemically identical to mined gold after refining — the…
Ingrid Sørensen · 15 min read
Industry · 7 August 2026
After the Cyanide
…shape. Reagent circuits are rinsed and neutralised before the plant is stripped. Tailings surfaces are capped to exclude oxygen and shed water, or kept saturated to achieve the same end from the opposite direction, because both starve the sulphide oxidation reaction of what it ne…
Tomas Herrera · 17 min read
Industry · 2 July 2026
Nine Nines: Inside a Modern Gold Refinery
…, copper and lead convert to chlorides that either volatilise off as fume or float to the surface as a molten salt layer that can be skimmed. Silver becomes silver chloride and joins the skim. Gold, being the least reactive thing in the crucible, is left behind. · The operator's…
Tomas Herrera · 12 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
