Gravity Concentration

Heavy Media Analysis – Ericsson Cone Separator

Ericsson Cone Separator

Where large samples (both in top size and weight) have to be examined it is not practical to use heavy liquids (being both expensive and time consuming). A laboratory heavy media separator may be used which simulates the action of a heavy liquid bath. Here is a schematically shows an Ericsson cone separator. Sized fractions of … Read more

Specific Gravity Distribution (Tolerance) Curves


The three types of curve described so far completely define the behaviour of the material in a heavy liquid under ideal sink-float conditions. In practice, we wish to use the data to predict the performance of a commercial process such as D.M.S., Jigs, Tables, etc. In these processes, the S.G. of separation will vary between … Read more

Cumulative % Assay of Floats or Sinks Curve

Cumulative % Assay of Floats or Sinks Curve

The cumulative % assay of the floats or sinks is plotted against the cumulative % weight of the floats or sinks. These curves indicate cumulative assay that the cumulative floats or sinks will have at a particular S.G. of separation. They are used in conjunction with the S.G. curve and can thus predict the weights … Read more

Dense-Heavy Medium Separation HMS / DMS Process

DMS Dense medium separation

HMS and DMS are acronyms for Heavy (Dense) Medium Separation and is applied to the process of pre-concentration of minerals – mainly the production of a high weight, low assay product, which may be rejected as waste. In principle it is the simplest of all gravity processes and is a standard laboratory method for separating minerals … Read more

Is Gravity Gold Free Gold

Being able to recover gold using a gravity method or process does not mean that gold is free and fully/completely liberated.  For example, using Automated Digital Imaging System (ADIS) for Gold Search (ADIS is an optical screening and imaging equipment package customized to locate gold occurrences in ground sample), a sub-sample of 8 samples representing 8 lithology for an … Read more

Mozley Drum Separator | Mozley Super Panner


The Mozley Super Panner is used for quick and efficient drum separation of mineral groups with distinct density differences and is generally used as a cleaner unit where the mass available for upgrading is very small: typically for Au applications. A centrifugal solids-liquids separator comprises a rotatable hollow centrifuge drum at least a part of … Read more