Behind every silver bar there is a foundry-refinery: a specialised plant that receives the raw metal, refines it, melts it and shapes it. Understanding how it works sheds light on what makes a bar valuable and reliable. Guided tour.
From raw material to bar: the journey
In a precious-metals foundry, silver follows a rigorous chain:
- Intake and weighing: the metal (ore, doré, recycled silver) is weighed, sampled and recorded. Traceability begins here.
- Analysis: a fire assay (cupellation) or a spectrometry determines the exact fineness of the batch.
- Refining: mainly by electrolysis, the metal is purified up to 999 fine.
- Melting: the refined silver is melted at 961.8 °C and homogenised.
- Shaping: casting in a mould (large bars) or rolling then minting (small bars).
- Marking and sealing: weight, fineness, logo, serial number, then certified packaging.
- Final quality control: checking weight, dimensions and appearance before shipment.
The central role of LBMA accreditation
Not all foundries are equal. The global benchmark is the Good Delivery List of the LBMA (London Bullion Market Association), which lists the refineries whose bars are accepted without question on the international market.
To be included, a refinery must demonstrate:
- sufficient production capacity and seniority;
- consistent, verified purity;
- financial strength and impeccable traceability.
A bar bearing the hallmark of a Good Delivery refiner is therefore, by design, more liquid: any dealer will buy it back with confidence.
The major silver foundries
Global production is concentrated among a few players:
- Switzerland: PAMP, Valcambi, Argor-Heraeus, Metalor;
- Germany: Heraeus, Geiger, Heimerle + Meule;
- North America: Royal Canadian Mint, Asahi Refining, Sunshine Minting, Scottsdale Mint.
Each has its specialities (finishes, security, formats). We devote a detailed profile to each refiner.
Security and anti-counterfeiting
Modern foundries incorporate features to protect their bars: serial numbers, holograms, micro-engravings, or digital authentication systems such as PAMP’s Veriscan, which records the surface “fingerprint” of each bar. These measures make the checks described in spotting a fake silver bar easier.
What this changes for the investor
- Buy a bar from a recognised foundry: it guarantees purity and smooth resale.
- Keep the seal and certificate: they extend the plant’s traceability all the way to you.
- On resale, your silver will ultimately return to a foundry to be remelted and refined.
In summary
- A foundry-refinery refines, melts, shapes and certifies silver.
- LBMA accreditation distinguishes benchmark refiners and guarantees liquidity.
- Production is concentrated in Switzerland, Germany and North America.
- Security and traceability protect the investor against fakes.
Ready to invest in a bar from a recognised refiner? Check the silver price and find your city.
This article is informational and does not constitute investment advice.