Natural Deportment

NatDeportCrackAnimv2 2

Natural Deportment is the propensity for some ores to exhibit preferential breakage leading to concentration of minerals into specific size fractions. This typically involves an increase of valuable mineral phases in finer size fractions, however has occassionally been observed in the coarser fraction under certain geological settings. The geology and mineral association of base and precious metal deposits is typically complex with many overprinting paragenetic events contributing to the creation of potentially mineable reserves.This is evident in features such as multiple vein events; different mineral associations and intergrowths; varying alteration styles and mineralogy’s; metamorphic overprints; banding; discrete lenses and replacement textures.

“This occurs when crack branching occurs more frequently in one of the mineral phases.

The most obvious manifestation of preferential breakage is a variation of average composition with particle size in the particle populations. This is often noticed in practice and is easy to detect and measure.”

R. P. King - Modelling and Simulation of Mineral Processing Systems 2001

Natural Deportment is an interaction function of these rock mass properties, texture, ore paragenesis and mineralogy at a range of scales. There is typically no relationship between magnitude of response and head grade, with the main control being textural rather than absolute abundance. Physical separation is a function of screening employed after blasting or primary crushing. Testing involves screening or sieving of a particle size distribution resulting from sampling production scale blasting (+/-primary crushing) material, or from crushing drillcore using a defined protocol. Sampling and testing protocols are generally readily capable of being completed by most onsite laboratories, or any commercial laboratory of a sites preference.

For Characterisation methods for Natural Deportment click HERE.

Page last modified on Friday July 24, 2020 08:02:55 AEST