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UMA S.A

Precious metal refining

The steps and methods of gold and precious metal refining at UMA S.A, for a purity of 99.95 to 99.99%.

UMA S.A will produce gold with a purity of 99.95 to 99.99% as investment bars, through the country's very first refinery, under construction in the East region, in the municipality of Bertoua 1st. A “Made in Cameroon” jewellery cutting, polishing and setting unit will complete the facility, with HRD and GIA certified gems.

The main refining steps

  1. 1

    Collection and sorting

    Collection of precious metals in the form of ore, scrap or jewellery.

  2. 2

    Grinding

    Crushing and grinding the ore to release the metal particles.

  3. 3

    Flotation

    Separating metal particles from impurities by flotation.

  4. 4

    Melting

    Melting the metal to obtain it in liquid form.

  5. 5

    Refining

    Removing impurities by adding chemical reagents.

  6. 6

    Electrolysis

    Separating metals by electrolysis.

  7. 7

    Crystallisation

    Forming pure metal crystals.

  8. 8

    Filtration

    Removing residual impurities by filtration.

  9. 9

    Quality control

    Checking the purity and quality of the metal.

Refining methods

  • Fire refining

    Melting the metal with a reagent to remove impurities.

  • Electrolytic refining

    Separating metals by electrolysis.

  • Refining by crystallisation

    Forming pure metal crystals.

  • Refining by distillation

    Separating metals by distillation.

Refining precious metals requires technical expertise and specialised equipment to guarantee the quality and purity of the metals.

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