Precious Metal Recycling
Also: Secondary recovery, Scrap gold recycling, Urban mining, Scrap recovery
Precious metal recycling is the recovery of gold, silver and platinum-group metals from end-of-life material such as jewellery, electronic scrap and industrial residues using chemical or thermal processing methods.
After primary mining, recycling is the single most important source of fresh precious metal entering the world market. A gold mine may yield just 1-5 grams of gold per tonne of rock, yet a tonne of processed electronic scrap can hold many times that amount, which is why industry specialists talk about urban mining: treating the city itself as an ore deposit.
Where does recycled material come from?
The feedstock falls into a handful of broad categories:
| Category | Typical sources | Main metals |
|---|---|---|
| Jewellery & scrap gold | Broken gold, heirlooms, remodelling offcuts | Gold, silver, platinum |
| Industrial residues | Vehicle catalysts, 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 a distinct niche of their own: typical dental alloys contain gold between 585 and 900 per mille (14-22 kt) alongside palladium and platinum, and are processed by specialist refineries.
How is the metal recovered?
Industrial refining applies different techniques depending on the input material:
- Pyrometallurgy (smelting): the scrap is melted at high temperature. Base metals are separated off through slags while precious metals collect in a lead or copper collector phase. This is typical for catalysts and electronic scrap.
- Hydrometallurgy (wet chemistry): precious metals are selectively dissolved using aqua regia (hydrochloric and nitric acid) or cyanide solutions, then recovered by electrolysis or precipitation. This route achieves very high purities.
- Combined processes: large plants such as those run by Umicore or Heraeus pair the two stages, using pyro as a first step and hydro for fine refining, reaching gold recovery rates as high as 99%.
You can estimate the current market value of your scrap material in advance with the melt value calculator.
Why it matters for the precious metal market
Recycling acts as a supply buffer. When the gold price rises sharply, more investors and dealers bring old material into circulation, and that additional supply tends to soften the price increase. When prices fall, recycling volumes drop, which underpins supply. This counter-cyclical behaviour sets recycling fundamentally apart from mine output, which responds to price changes only after a delay of years.
The same principle applies to silver: its industrial share is higher, so recycling from photovoltaic panels, electrical equipment and photography carries particular weight.
The environmental and sustainability angle
Recycling consumes far less energy than mining primary ore and avoids the land-intensive footprint of open-pit mining. It therefore makes a measurable contribution to concepts such as responsible gold and Fairtrade gold, while easing demand for conflict gold from problematic mining regions.
Note: In Ireland, gains on the sale of bullion may attract Capital Gains Tax at 33% above the annual personal exemption, with no holding-period relief. The tax treatment of scrap gold sales varies from person to person. This is not tax advice.
In a nutshell
Recycling supplies roughly a quarter of annual gold output and is an indispensable part of a stable precious metal market. The recovery rates of modern refineries far exceed the yield of primary mines, and at a considerably lower resource cost.