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    Details

    • Home
    • MINING NOTES
    • LEGISLATION
    • COAL MINE REGULATIONS
    • STONE DUST BARRIERS

    STONE DUST BARRIERS

    • 16-05-2022
    • 9498
    • 0

    1. GENERAL: 

    1.1 Stone dust barriers shall be placed in the full path of the explosion and the shelves 

    shall be so arranged that their collapse in the event of an explosion is not impeded. 

    • 1.2 Barriers shall be sited as low as convenient within the upper third of the roadway; 

    and no part of any shelf and no stone dust on it shall be less than 10 cms. from the roof 

    or sides of the roadway or any roadway support. In addition, the shelves shall be 

    constructed and installed that, in the event of an explosion, they fly without obstruction 

    along the roadway. 

    2. DESIGN OF BARRIERS: 

    • 2.1 The stone dust shall rest on boards which run longitudinally in the roadway and 

    whose length equals the width of the shelves. These boards shall rest on a rigid frame, 

    the two members of which shall be at least 15 cms. in depth and rest on their edge on 

    two fixed rigid brackets. 

    • 2.2 Neither the boards nor the frame shall be fastened either to each other or to the 

    fixed brackets. 

    • 2.3 Primary or first or light barriers which are intended to be installed nearest to be a 

    possible point of ignition, when installed, shall consist of lightly loaded shelves (see 

    below) not more than 35 cms. in width. 

    • 2.4 The distance between two shelves of a light barrier shall be not less than 0.9 m. 

    and not more than 2.0 m. 

    • 2.5 The shelves of a light barrier shall be loaded with not more than 30 kg. of dust

    per metre of shelf length and the total quantity of stone dust in the barrier shall be less 

    than 110 kg. of stone dust per sq. metre cross-section. 

    • 2.6 Secondary or heavy type of barriers (see below) intended for use further outbye 

    shall consist of one third of its shelves lightly loaded and spaced (see below) as in 

    case of primary barriers. 

    • 2.7 The loading for a heavy barrier shall be 390 kg. per sq. metre of the cross-section. 

    The shelves shall not exceed 50 cms. in width and their loading shall not exceed 60 

    kg. per metre of shelf length. 

    • 2.8 The distance between heavily loaded shelves or between a heavily loaded shelf 

    and a lightly loaded shelf shall not be less than 125 cms. and not more than 270 cms. 

    • 2.9 The lightly loaded shelves shall be adjacent to each other and placed at the in bye 

    end of the barrier. 

    • 2.10 Where circumstances require intermediate barriers, such barriers shall be loaded 

    with 195 kg. of dust per square metre of roadway, half the dust being placed on lightly 

    loaded shelves and half of heavily loaded shelves. The lightly loaded shelves being 

    arranged at the inbye end, as in the case of heavy barriers. 

    • 2.11 When calculating the quantity of stone dust in a barrier, cross sectional area 

    shall mean the average cross sectional area determined by an offset survey of the 

    roadway where the barrier is installed. The amount of stone dust in the lightly loaded 

    shelves in a heavy barrier shall be calculated proportionately on the basis of average 

    length of the shelf as determined from the offset survey plan. 

    • 2.12 For maximum dispersibility the dust shall be piled loose on the shelves. The 

    dust shall also be of a type that will not cake in use; in damp or wet condition waterproofed stone dust shall be used. 

    • 2.13 Where a roadway has to be enlarged to provide sufficient height to 

    accommodate a barrier, the ripping shall extend over a distance on each side of the 

    barrier equal to at least 20 times the difference between the height of the top of the 

    stone dust on the barrier and the height of the unripped roadway. 

    • 2.14 When sitting a barrier, the distance as specified shall be measured from the shelf 

    nearest to the face.






    CLICK ME TO DOWNLOAD NOTES ON STONE DUST BARRIERS




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