The extraction and processing of the stone types used by Minera requires less energy than other materials, and even other types of natural stone, for the following reasons:
- Quarrying requires little energy. Extraction entails drilling a rough pattern of holes that often follow weak zones in the rock. The blocks are then loosened using a hydraulic breaker and transported to the factory, which is located a short distance away.
- Much of the work of splitting the stone is done by hand, using a hammer and wedges. Most of the finished products are supplied with a natural, split surface. This consumes less energy than materials where processing involves sawing and grinding.
- Transport from the factory to the customer requires relatively little energy compared with most imports from the East.
The extraction and processing of the natural stone types used by Minera does not result in the release of any harmful substances into the air, water or soil.
Natural stone for outdoor use is usually laid on a loose substrate and so can be re-used.
All natural stone that is held in place on roofs and outside walls by screws or nails can also be re‑used.
Stone used in dry-stone walling can be converted, rebuilt and re-used. Even stone that has been held in place with mortar can be re-used once the stone has been cleaned up.
The natural stone is not flammable.
Exposure of the stone to fire does not result in the release of any smoke or harmful gasses.
Stone products that have been cemented to floors and walls can rarely be re-used. However disposing of these stone products will not result in any harmful emissions.
Natural stone has a beneficial effect on indoor climate in the same way as other heavy materials. It stores energy and helps to reduce temperature fluctuations more than lighter materials. Natural stone does not release any gasses that are harmful to the indoor climate.