SCHEDULE SUPPORT SYSTEM STANDARDS FOR MINES OF COAL

PART II SUPPORT SYSTEM STANDARDS FOR ROADWAYS
8 In the case of roadways where props and bars are used as the principal support–
(a) the maximum distance between adjacent bars shall be 1.2 metres;
(b) the minimum number of props per bar shall be 2; and
(c) the maximum distance from the last bar to the face shall be 3.5 metres.
9 In the case of roadways where steel arches are used as the principal support–
(a) the maximum distance between adjacent arches shall be 1.2 metres; and
(b) the maximum distance between the last arch before the face and the face shall be 3.5 metres.
10 In the case of roadways where rockbolts are used as the principal support–
(a) the minimum density of rockbolts in the roof shall be 1 bolt per square metre;
(b) the minimum length of rockbolt in the roof shall be 1.8 metres; and
(c) the maximum distance between the last completed row of rockbolts and the face shall be 3.5 metres.
11 In the case of roadways where machines are used to cut and simultaneously load, the maximum advance per cycle of any such machine shall be 1.2 metres.
12 In the case of roadways where persons work or pass in front of the last permanent support–
(a) temporary supports shall be used; and
(b) the maximum distance between the last permanent support and the first line of temporary supports shall be 1.2 metres, except where props are used, when that distance shall be 0.9 metres.
13 For the purposes of this Schedule “bar” means a support designed to be set between a prop and the roof.