What type of materials should be used for constructing stoppings?

The appropriate choice for constructing stoppings in an underground mine is incombustible materials. Stoppings serve as barriers to control airflow in passages or sections of the mine, and using incombustible materials is crucial for safety. These materials help prevent the spread of fire and ensure that smoke and toxic gases from any potential fire do not travel through the mine, compromising the safety of miners.

Incorporating incombustible materials such as concrete or masonry ensures that the stoppings are not only effective at isolating areas but also meet fire safety regulations, which are critical in an underground environment where conditions can be hazardous. The structural integrity of stoppings made from incombustible materials also contributes to their ability to withstand pressure and maintain airflow management.

While materials like wood and plastic may be lighter and easier to work with, they are not suitable due to their flammable nature, which poses significant risks in a mine. Recyclable materials may be environmentally friendly but often lack the necessary fire resistance and structural properties required for stoppings. Durable metals could be considered, but they are typically heavier and more costly, making incombustible materials the preferred choice for this application in mining safety practices.