
Silver refinery services
StoneX Metals Ltd is a precious metal refining service specializing in silver refining. We are one of only two UK precious metals brokers accredited by LBMA to supply 'Good Delivery' silver bars guaranteed at 99.9+% purity to the London Bullion Market.
Sustainable & efficient silver refining solutions
We specialize in the refining of silver scrap recycled through silver recovery services and a variety of industrial waste streams, utilizing advanced technology to ensure a pure material with minimal environmental impact.
Refinery materials
StoneX silver refining service receives 98%+ high grade silver in various forms from our customers and converts them to 99.99% pure ‘Good Delivery’ silver bars including:
- Silver Dore
- Silver Flake
- Silver Bullion, grain or wire
- Other metallic silver – bars, manufactures scrap
Silver refining process
StoneX’s electrolytic silver refining process combines modern technology with a traditional pyrometallurgical operation. Recovering and refining silver begins in a blast furnace, where suitable silver scrap materials are incinerated to ash. The ash is mixed with other silver-bearing materials and heated in a blast furnace. The material reacts to producing a lead-silver alloy with a silver purity of up to 50%. The alloy undergoes preferential oxidation to remove the lead, producing 98%+ high-grade silver and lead oxide (litharge). The litharge is recycled, and the silver is cast as doré beads and sent to the refinery.
The refinery receives the 98%+ silver from the cupel and uses moebius cells to further purify the silver. The cells contain titanium mesh baskets, which act as the anode, into which the bars are placed. The baskets are submerged in an acidified silver nitrate electrolyte. When an electric current is applied to the bath, the silver ions in the alloy migrate and deposit as silver crystals on the cathodes. The crystals are scraped from the cathode, collected, melted, and cast into 1000 troy ounce 99.99% silver ‘Good Delivery’ bars conforming to international standards and stamped as 999.
Materials received
Silver scrap materials are received and secured, weighed, and given a unique individual identity number, which enables them to be tracked through the preparation and sampling stages.
Secure facility
Securing our customer’s materials and precious metals is paramount and StoneX has the following measures in place:
- Continuous (24/7) manned security presence
- CCTV, card access and alarms where metals are stored and handled
- Security search and metal scanning of all persons leaving the production site
- High security vault, fitted with alarms, cameras, and smoke-cloak for storage
Sampling and assessment
All incoming materials undergo advanced analysis by our fully equipped and versatile sampling department, utilizing state-of-the-art equipment, to determine silver content.
Fire assay
Samples are assayed in our laboratory using a variety of methods from lead or nickel collection to Inductively Coupled Plasma Optical Emission Spectrometry (ICP OES)
Silver purification
Refining to the highest industry standards, we receive 98%+ high-grade silver and, using electrolysis, convert the silver to 99.99% pure, ensuring exceptional metal quality.
Casting
Silver crystals are melted and cast into 1000 troy ounce 99.9% silver ‘Good Delivery’ bars.
Refinery Schematic
StoneX's silver refinery services provide the purification of silver by electrolysis.
Why Choose StoneX Metal Refinery?
LBMA Good Delivery Bars
Accredited by LBMA to supply 99.9+% pure silver ‘Good Delivery’ bars to the London Bullion Market.
Environmental compliance
Strict adherence to Environmental Agency and industry regulations across the supply chain helps mitigate our environmental impact.
End-to-end exceptional service
From recovery and refining to physical silver trading, superior customer service is the primary focus of our world-class global metals team.
Flexible & scalable solutions
From recovery to refining and final product delivery, we offer bespoke silver waste recovery and silver refining solutions for businesses of all sizes.
Integration with wider StoneX services
From physical trading to risk solutions, we are backed by the leading global financial services of StoneX Group, Inc.
The environment
The Environment Agency issues an Environmental Permit to which we must adhere in order to manage any associated environmental impacts. To ensure compliance, we monitor our environmental performance internally via our Environmental Management System, and through Environment Agency audits. We are also accredited with ISO 14001:2015, which is internationally recognized standard for measuring EMS.
View our environmental permit, 14001 Certificate and other safety and regulation documents here.
Site environmental controls
- Documented Environmental Policy, Operating Procedures & Emergency Response and Business Continuity Plans
- Secure site bounded by perimeter walls and drainage channels
- Surface water collection and recirculation system
- Abatement plant for process emissions with continuous monitoring of particulates and periodic monitoring of stack emissions
- Energy monitoring
- Full traceability of all incoming and outgoing waste transfers
StoneX Metals Ltd disclosures
Investing in precious metals carries inherent risks, including market fluctuations, liquidity changes, and regulatory considerations. StoneX is committed to transparency and compliance, providing disclosures to help clients make informed decisions.
Press release
'StoneX completes acquisition of JBR Recovery’s recycling and refining business, to deepen the company’s end-to-end metals offering'
StoneX Metals Limited Refinery location
For detailed instructions to our location, please click below.
Silver recovery services
At StoneX Recovery, we specialize in the recovery of silver from a variety of industrial waste streams, ensuring maximum yield with minimal environmental impact.
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