Johnson Matthey Mint

Johnson Matthey Mint

Johnson Matthey History

Johnson Matthey has almost 200 years of experience in the Precious Metals industry. The mint began in 1817 when Percival Norton Johnson established his Gold assaying business in London. George Matthey joined the company in 1851, officially making it Johnson & Matthey. A year later, the company was appointed to be Official Assayers and Refiners to the Bank of England and in 1861, they were approved as Refiners for the Bank of England.

The Mint’s dedication to responsible Precious Metal production and interest in technological applications is evident in Johnson Matthey’s history. In 1874, it produced the first standard meter and weights in Platinum-iridium for the International Metric Commission. The next year, they supplied Platinum leads for the first electric lamps. In 1974, the company produced the first catalysts to control vehicle pollution. And in 1989, Johnson Matthey began commercializing the Platinum-based anticancer drugs it had developed.

Refining History

Johnson Matthey may not offer refining services any longer, but it has a long and proud history as one of the UK’s primary refiners. It had a longstanding reputation for integrity and expertise. The refining process Johnson Matthey used was highly complex and involved a profound understanding of PGM science, pyro-metallurgy, multi-stage chemical separations and analytical science. Their Precious Metals refining process involved four major steps:

    1. Evaluation - An essential step for Precious Metals refining, evaluation involves determining the Precious Metal content of the customer’s material. It allows the refiner to communicate accurately the quantity or value of Precious Metal it will be able to return to the customer.
    2. Smelting - A pyro-metallurgical process that melts down metal at over 1200°C for around 12 hours. In large furnaces, non-metallic components are separated from the desired material. Two types of bullion feed are produced by this process: Silver, which also contains the Platinum and Palladium, and iron, which contains all five types of Precious Metals.
    3. Chemical Leaching - Once formed, the two different types of bullion then undergo multiple leaching processes to concentrate the Precious Metals into solution. Gold and Silver are removed from the Platinum and Palladium.
    4. Chemical Separation - This multi-stage process separates the five Precious Metals into their final products through solvent extractions, evaporation, dissolution, precipitation, and filtration. These processes create the highly pore orgometallic salts for each PGM. These salts then undergo heat treatments that transform them into their final PGM, which is then prepared for sale.

    With almost two centuries of service in the Precious Metals industry, time has helped shape Johnson Matthey into one of the world’ best known mints. While it may no longer operate its refining services, Johnson Matthey Gold, Silver, and Platinum products are still highly sought after. Consider Johnson Matthey bars if you are interested in making an investment in a brand that offers Precious Metals that are widely recognized and respected around the world.

    Satisfaction Guaranteed

    We provide all of our customers with a refund, return and / or exchange on everything we sell including all bullion and certified coins. If for any reason, you have a problem, please feel free to call us. We will always do our best to accommodate you.


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