AST has an office in Moscow, and a track record of bringing innovative Russian technologies to Africa See link to Terravision: 

AST has agency rights to procure, containerise, install, commission and manage Bourevestnik Autosorters. Our staff are on hand in Moscow to also procure fully trained and bi-lingual technicians to service the plant and also ensure that spares are delivered on time.

X-Ray Autosorting

The current technology used to recovery diamonds from gravels involves passing a stream of gravel through a curtain of X-rays.

Exposure or irradiation to X-rays causes the diamonds to fluoresce.

The fluorescence is picked up by a sensor, which initiates a pneumatic device using compressed air to eject or separate the diamonds from the gravel stream.

The process is generally known as X-ray separation but there are a number of different design applications for how the technology is used.

Important differences are the way in which the X-rays are generated and transmitted and how the X-ray fluorescence is detected and analysed prior to the diamond being ejected. Most commercial systems use a similar methodology in this regard.


Russian modular high-tonnage diamond X-ray treatment plants are containerised for ease of erection and commissioning.

The sorters are:

  • Relatively low-cost, efficient solution to treat high tonnages of run-of-mine diamond-bearing ore which has been used by the Russians for over 30 years.
  • The compact plants can successfully treat run-of-mine  –50 mm to +20 mm material at 100 t/h, –20 mm to +10 mm at 60t/h, and –10 mm to +5 mm at 30t/h, and are able to recover a number of Type IIa diamonds, which are difficult to recover using conventional X-ray sorters.
  • Bourevestnik has a different approach in its application of X-ray irradiation and consequent fluorescence detection and analysis.
  • Improved recovery of Type II diamonds compared to more conventional X-Ray sorters.
  • Bourevestnik sorters can result in about 50% power and water-use reduction, compared with dense-media separation (DMS) plants.
  • Utilising the Bourevestnik’s bulk sorting capacity is key to reducing the requirement for concentration using  inefficient and out-dated pan plants and conventional DMS.
  • Maintenance, labour and system downtime are also reduced by at least 30%, as the production availability of the sorters is high, with minimal breakdowns, delivering increased security.


AST is able to professionally “containerise” Bourevestnik autosorters:

  • 6 meter High Cube marine container fitted with chromadek and polystyrene insulation cladding;
  • Additions:  a feed input hopper bin, tailings and concentrate discharge chutes, cat-ladder, stairs and landing platforms, mounting frames, applicable brackets, floor drain, sorter support base and safety railing;
  • Automatic control rack and instrumentation control panel, UPS and isolation transformer;
  • 24,000 BTU Air Conditioner, lights, wall plugs, and electrical power distribution board.  External water chiller unit, air compressor (Rotary screw type) including an air reservoir, associated filters and refrigerated air dryer.

Bourevestnik Concentrate Box 


See below video of Bourevestnik autosorters in action