Mining Operations - Void filling - Ventilation Air Control

Void filling for mining operations in South Africa

We did a series of video productions for Minova RSA. I have adapted the scripts a little so it gives through information on their products.

Filling of voids left from fall-outs is necessary to prevent accumulation of hazardous gases and to stop the excavation from progressive enlargement by self-mining.

Void filling material must have a controlled but generally low strength.

The Minova void filling materials range from 0.3 Mpa to 10 Mpa strengths and from slow setting to fast setting foams to almost suit every requirement.

Large volumes must often be filled, usually within tight time constraints. Minova’s cement foams  – the Tekseal and Air-o-cem range – are ideal void filling materials. These are supplied as powders, to be mixed with water and pumped directly into the void. The amount of powder used is typically only 7 – 20 percent of the quantity of solid material that would have been required. The foam is placed as a formulated cementitious foam, enabling rapid placement. Strength and setting speed is controlled by selection of the appropriate grade of Tekseal and of the water/powder ratio during pumping. A special foam mix and placement pump is used for these products and also varies in size to suit placement of quantities.

High-strength seals for backfilled stopes and explosion sealing

Tekseal HS is used for construction of high-strength bulkhead seals at the base of high backfill stopes, and for explosion-proof seals in coal mines. The high strength combined with low volume to be transported make them suitable for both purposes.

Ventilation Air Control

Air-O-Cem cement foam can be used for general void filling and the construction of lightweight barriers for normal ventilation air control and for sealing off fires to starve them of air.

Grout Packs

Minova RSA can supply cementitious powder that replaces OPC for use in standard grout packs. The powder blend formulations are customised to user’s requirements and offers high strength and fast setting times.

Need more information? Please e-mail your contact details to and we will forward it to Minova RSA.  Or contact Hazel Koen at Minova RSA - 011 923 1900 with reference AD-land.

Comments are closed.