How do jewellers capture every last particle of gold dust? (2017)
Goldsmiths and jewelers go to remarkable lengths to capture every speck of precious metal, from specialized ventilation and enclosed CNC machines to periodically burning carpets, filters, and even floorboards to recover accumulated dust. Commenters connect these practices to broader “urban mining,” such as scavenging gold and gems from city streets or reclaiming silver and platinum from industrial waste, and note that small quantities can add up to significant sums over time. The thread also highlights how little intrinsic resale value most jewelry and gemstones have compared to their retail prices, underscoring that much of what buyers pay for is labor, branding, and sentiment rather than raw materials.
Workshop practices and dust capture
- Jewelers typically do not use sealed gloveboxes: intricate handwork, magnification, frequent torch use, and hazardous chemicals (sulfuric acid, cyanide fumes, ammonia baths) make full enclosure and gloves impractical and unsafe.
- Instead they rely on:
- Local suction at polishing stations and other dust sources.
- Leather aprons and carpets to trap fine dust; carpets and sticky door mats are periodically destroyed and refined.
- Collection of emery paper, polishing wheels, filters, doormats, and even floorboards for incineration and metal recovery.
- Specialized CNC and laser systems sometimes operate in enclosed, filtered environments, with controlled access to swarf bins.
Urban and secondary “mining”
- Stories of sweeping floors and sidewalks in jewelry districts (NYC, Karachi, London, India) and extracting gold or gem dust recur.
- Some examples and videos are praised as educational; others are criticized as marketing stunts selling “paydirt” or unrealistic dreams.
- Similar reclamation is reported for silver (e.g., film processing, even shower wastewater) and platinum-group metals from roadside dust.
- Commenters note landfill and old buildings may eventually be mined for concentrated metals.
Economics of scrap and resale
- Tiny scraps from ring resizing are low-value per job, but worth aggregating; some advise customers to request their own scrap, others see that as not worth the hassle.
- Dental labs and refiners report significant decade-scale payouts from burning carpets, but per-day value is small.
- Second-hand jewelry and stones have poor resale value; dealers often pay ~70% of gold spot for “salvage,” far less for stones and especially gold teeth.
- Many retail jewelry prices are driven more by brand, design, and sentiment than metal or gem content.
Health, materials, and side discussions
- Gold dust inhalation is noted; gold is described as largely biochemically inert, but actual health impacts are unclear in the thread.
- There is brief exploration of e‑waste recovery (gold, gallium, indium) and the idea that future cheap energy might enable large-scale elemental separation.
- Tangents include Manhattan Project silver loans and detailed debates over tons/tonnes and SI units.