Minerals available for sale

Clay

SDL has clay available at Roundwood, Rotherham, that has been used on many projects.  It has certification both for impermeability (1 x 10-9) and falling head permeability.  It has been used for canal repair works, flood defence embankments, pond lining and even shaft filling.

Sand and Gravel

These are Don Valley sands and gravels, lying immediately below the clay horizon at Roundwood.  The gravel element is partially quartz and partially sandstone.  There is, as is typical of such deposits, a relatively high silt and clay content that requires washing to obtain pure sand. There is also a minor transported coal fragment, often referred to as lignite, present which again requires separation before the material meets British Standards for concrete use.

Some of the material has been dry screened and gravel fractions sold.

It is an excellent material for ballast or concrete use for bases etc. where the BS is not applicable or as part of a blend with other sands and gravels.

Ash

Clinker ash is available which is suitable for a variety of uses, including light weight aggregates for block manufacture etc.

Inert engineering fill

A variety of imported and as dug inert fill is available.  In the past some of this has been screened for landfill site capping.  Further screening can be carried out to order.

Coal slurries

SDL has slurries on its own sites and trading arrangements in place from several sources, for use as a blend with coal or use on its own for specialist markets.

Burnt shale

From time to time burnt shale, otherwise known as red shale, is available at Roundwood.  This is usually screened for use on paths and tracks or golf courses.

Coal

From time to time SDL has in-situ coal available from its own operations but is also involved with several companies on winning coal from quarries etc. and trading them on an in-situ basis or screened and blended to a specification.

Shale

SDL currently supplies a large annual tonnage of shale to a specification to a blue chip customer for use in brick manufacture.  The prime purposes of the shale are, when mixed with the marl, to control shrinkage in the kilns to the British Standards and provide frost resistance, as well as strength.