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We design, manufacture and supply a range of enhanced gravity separators previously known as the Richard Mozley Multi Gravity Separator (MGS).


Our laboratories are ready to assist you in assessing your material and designing pilot and production gravity mineral separation systems.

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Who we are

Who we are


We are a team of industry professionals based in Cornwall, United Kingdom. 

We have spent the majority of our careers working in metallurgical and mineral processing, predominantly focused on gravity separation and concentration.


In the early days, we were involved in the engineering and manufacturing of multi-gravity separators which were used widely in the Cornish Tin industry to prolong mine life beyond original expectations.


This has paved the way for the improvements in recent years where we have been able to focus on reliability and ease of use.

Our Machines

Our Machines

Laboratory Machines

Laboratory Machines


Recovery of valuable fine mineral particles minerals is a difficult problem in mineral processing and particularly in gravity separation. With decreasing particle size (<100 μ), the force associated with the water flow becomes dominant over that associated with gravity.

The MGS is effectively an enhanced gravity-shaking table. The table surface is folded forming a drum which on rotation creates variable centrifugal force or “enhanced gravity”. A sinusoidal shake is applied to this drum along its axis of variable amplitude and frequency. Under the effect of the centrifugal force, the heaviest particles penetrate the pulp film and are pinned against the inner surface of the drum where a series of scrapers drag these heavy minerals to the concentrate outlet.

Production Machines

Production Machines


The lighter particles (the gangue) are carried by the wash water to the rear of the drum and the tailings outlet.

Because the centrifugal force applied to the particles is far greater than the force of gravity exercised on a conventional shaking table, the separation between heavy and light minerals is in principle easier with the MGS than with conventional equipment. Separation is effective where there is a 1 SG unit difference between the target mineral and gangue material.

The ore processing capacity of the mobile units and laboratory units is 200kg/hr and the industrial unit has a capacity of 3.5 t/hr per module.

The machines are low energy, mobile and highly reliable.

All products designed and manufactured in the United Kingdom union flag
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Testing

Testing

Small sized particles have always been a challenge in mineral processing. Indeed miners have gone to great lengths not to overgrind and produce slimes.

We believe small is beautiful and work specifically in this fine size area.


With our specialist techniques we can often take your mineral sample, grind it finer, liberating more valuable mineral that can be concentrated by our enhanced gravity machines.

These innovative techniques are well proven from the clay industry, scalable and economically definable.


Our testing scheme uses laser size analysis, QemScan and controlled fine grinding to produce a product capable of enhanced gravity separation.


Other customers find that their material is naturally friable. Examples would include Tungsten and Tin and turn to our technology to increase their recovery.

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Contact Us

Contact Us

Treve Mildren

Gravity Mining Limited

  • Glencrellow,
  • New Road,
  • Stithians,
  • Cornwall,
  • TR3 7BL
  • United Kingdom

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