Mineral concentration specialists

GCA has provided concentration equipment and services to the world’s largest mining companies and project management firms for several decades. We offer the highest quality mineral concentration products and techniques to suit the specific needs and budget of our clientele.

Suppliers Of World-Leading Concentration Products


In 1976, Byron Knelson designed the first Knelson Concentrator and revolutionised the gravity concentration industry. Ever since, continuous R&D ensures that Knelson Concentrators, now owned by FLSmidth, continues to pioneer and dominate the gravity concentration industry.

The initial batch concentrator was and still is the best on the market at recovering free, or gravity recoverable gold (GRG), as well as other precious heavy metals. The continuous variable discharge (CVD) model allows recovery of everything from fine free gold to high specific gravity minerals such as tantalum, cassiterite, chromite and mineral sands; or the pre-concentration of sulphide minerals and the scavenging of tailings streams.

Consep Acacia

The Consep Acacia Reactor is a complete intense leaching plant that maximises the recovery of gold from gravity concentrates. Often used downstream from FLSmidth Knelson Concentrators, the Acacia produces the optimum solid-liquid interaction for maximised gold leaching kinetics by using an up flow fluidised reactor as opposed to complex mechanical agitation.

GCA is the official African agent for the Consep and has an abundance of experience in testing, commissioning and installing the machines.


Filtaworx is a comprehensive range of fully automated, self cleaning screen filters. They have a number of useful applications, in multiple industries, and are particularly helpful in African areas that have poor quality water. Filtaworx filters are fantastic at ensuring better quality fluidisation water for FLSmidth Knelson Concentrators, as well as other mineral processors.

GCA is the official Filtaworx agent for mining and industrial applications throughout Africa.


Shaking tables are often chosen by smaller or cost-conscious gold mines for production of smeltable gold from gravity concentrates, where they are located downstream of FLSmidth Knelson Concentrators and APT GoldKachas. Shaking tables are also often used for primary concentration of gold and other heavy minerals from ores.

GCA is an accredited supplier of Gemini shaking tables, and is able to commission and install them on plants, in addition to supplying our own model of shaking table.


The Appropriate Process Technologies (APT) GoldKacha is an affordable and efficient gravity mineral concentrator, suited to small gold or heavy mineral plants. GoldKachas are simple and robust concentrators that achieve high recovery levels for both fine and course feeds using centrifugal force.

GCA is a registered agent and corporate affiliate of APT, selling and installing the concentrators on a regular basis.


Appropriate Process Technologies (APT) produces a wide range of off-the-shelf and custom-designed mineral processing plants for recovery of everything from gold to lead, tungsten, chromite or tantalite, using all common processes such as gravity concentration, leaching and flotation. APT plants are designed as fully modular systems inclusive of everything from water supply ponds and piping to plug-and-play electrical systems. In line with APT’s philosophy of appropriate technology, fast lead times and sharp pricing, pre-assembly and testing allows for extremely fast erection on site, often allowing mines to be in production within days of arrival of the plant.

GCA is a corporate affiliate and registered agent of APT, supplying OEM equipment into APT plants and providing support and service.


GCA prides itself on customer satisfaction, and our staff is driven by our customers’ success. GCA operates a registered Knelson test facility and will conduct or manage mineral testwork on behalf of clients in order to better consult on concentration technology requirements., GCA’s spares department efficiently handles enquiries from throughout the African continent, and our support personnel travel from Cape to Cairo and Dakar to Djibouti to ensure that our satisfied customers remain as happy as they were on the day when they first commissioned our equipment.

  • Look after your customer and business will look after itself

    Byron Knelson



We do more than build projects — we build partnerships that help businesses grow.


  • 218 Newmarket Road, Northriding, Johannesburg, South Africa
  • +27 (0) 11 704 6678
    +27 (0) 11 704 7289
  • info@gca.gold