Recycling of Precious Metals
Also: Secondary Recovery, Scrap Gold Recycling, Urban Mining, Scrap Recovery
Recycling of precious metals refers to the recovery of gold, silver, and platinum group metals from scrap material such as jewellery, electronic waste, and industrial residues through chemical or thermal processing methods.
Recycling is, after primary production, the most important source of new precious metal volumes on the world market. While a gold mine often yields only 1–5 grams of gold per tonne of rock, one tonne of processed electronic scrap contains many times that amount — which is why industry experts speak of urban mining: the city as an ore deposit.
Where Does the Recycled Material Come From?
The raw material sources can be divided into three main categories:
| Category | Typical sources | Main metals |
|---|---|---|
| Jewellery & scrap gold | Broken gold, heirlooms, remodelling | Gold, silver, platinum |
| Industrial residues | Catalytic converters (automotive), laboratory equipment, dental alloys | Platinum, palladium, rhodium, gold |
| Electronic scrap (e-waste) | Circuit boards, contacts, connectors, mobile phones | Gold, silver, palladium |
| Coins & bars | Sales by private investors, distress sales | Gold, silver |
Dental gold and dental alloys form their own niche: typical dental alloys contain gold between 585 and 900 ‰ (14–22 ct) as well as palladium and platinum, and are processed by specialised refineries.
How Does Recovery Work?
Industrial affinage / refining uses different processes depending on the source material:
- Pyrometallurgy (smelting): The scrap material is melted at high temperatures. Base metals are separated off via slag; precious metals collect in a lead or copper collector phase. Typical for catalytic converters and electronic scrap.
- Hydrometallurgy (wet chemistry): Precious metals are selectively dissolved using aqua regia (hydrochloric/nitric acid) or cyanide leaching and subsequently recovered electrolytically or by precipitation. Enables very high purities.
- Combined processes: Large-scale plants such as those of Umicore or Heraeus couple both stages — pyro as a preliminary step, hydro for fine refining — achieving recovery rates of up to 99% for gold.
You can estimate the current market value of your scrap material in advance using the melt value calculator.
Significance for the Precious Metals Market
Recycling acts as a supply buffer: when the gold price rises sharply, more investors and dealers bring scrap material into circulation — the additional supply tends to moderate the price increase. When the price falls, recycling volumes decline, supporting supply. This counter-cyclical behaviour fundamentally distinguishes recycling from mine production, which responds to price changes only with a delay of years.
The same principle applies to silver: the industrial share is higher, which is why recycling from photovoltaic systems, electrical equipment, and photography is particularly significant.
Environmental and Sustainability Aspects
Recycling requires considerably less energy than extracting primary ores and avoids the land-intensive interventions of surface mining. It thereby makes a measurable contribution to concepts such as Responsible Gold and Fairtrade Gold. At the same time, it reduces demand for conflict gold from problematic mining regions.
Note: The tax treatment of proceeds from the sale of scrap gold in the United Kingdom depends on individual circumstances. Gains on the disposal of non-legal-tender items and gold bars may be subject to Capital Gains Tax above the annual exempt amount, while gains on UK legal-tender coins from The Royal Mint are exempt. This does not constitute tax or investment advice.
In Brief
Recycling supplies around a quarter of the annual gold supply and is an indispensable component of a stable precious metals market. The recovery rates of modern refineries far exceed the yield of primary mines — and at considerably lower resource cost.