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3 results for “Artisanal and small-scale mining (ASM)” in Science
Science · 8 August 2026
The Metal That Went Medical
…virus. · Gold nanoparticles are red because collective electron oscillations — surface plasmons — absorb green light at around 520 nanometres. · The colour is size-dependent and aggregation-sensitive, which is what makes the particles usable as a readout rather than just a pigme…
Amara Okonjo · 15 min read
Science · 10 August 2026
Where Gold Actually Comes From
…. · A 'rich' deposit is still roughly one part gold to a million parts rock, which is why mining is an exercise in moving overburden rather than collecting treasure. · Is it true that all gold comes from exploding stars? Broadly, yes — but not from ordinary supernovae alone. Gold…
Tomas Herrera · 18 min read
Science · 9 August 2026
The Metallurgy of Karat
Pure gold is too soft to hold a stone, too soft to hold an edge, and the wrong colour for half the world's taste. Almost everything you own that is gold is a designed alloy — and the design is where t…
Tomas Herrera · 16 min read
