Government of Canada / Gouvernement du Canada
Symbol of the Government of Canada

Search

Coal Mining Occupational Health and Safety Regulations (SOR/90-97)

Regulations are current to 2020-03-05 and last amended on 2006-06-15. Previous Versions

PART IExplosives and Detonators (continued)

Precautions Before Firing a Shot

  •  (1) Before firing a shot, a shotfirer shall

    • (a) determine a danger area that extends at least 30 m from the shot hole;

    • (b) evacuate all persons from the danger area; and

    • (c) post sentries at the limits of the danger area.

  • (2) The sentries referred to in paragraph (1)(c) shall prevent any person, other than the shotfirer, from entering the danger area until the shotfirer verifies that the area is safe to enter.

  • (3) No person, other than a shotfirer, shall enter the danger area referred to in subsection (1) until the person has been informed by the shotfirer or a sentry that it is safe to do so.

 Immediately before firing a shot, a shotfirer shall repeat the test referred to in paragraph 21(a).

 Where a shot or round of shots is fired, the shotfirer shall make an examination of the effect of the shot or round of shots before the next shot or round of shots is fired.

Firing with a Blasting Machine

  •  (1) Where a shot is to be fired with a blasting machine, the shotfiring cable shall be not less than 30 m long.

  • (2) No person, other than a shotfirer, shall connect a shotfiring cable to detonator wires or to a blasting machine.

  • (3) Where a shot is to be fired with a blasting machine, the shotfirer shall, in the following sequence,

    • (a) twist the ends of the shotfiring cable together at the blasting machine and isolate them from ground;

    • (b) check the shotfiring cable and the detonator circuit;

    • (c) connect the shotfiring cable to the shot;

    • (d) check the total circuit;

    • (e) verify that all persons in the danger area referred to in paragraph 22(1)(a) have been evacuated from that area;

    • (f) connect the shotfiring cable to the blasting machine, verifying that the shotfirer alone has possession and control of the blasting machine;

    • (g) shout “FIRE” or “TIR”;

    • (h) verify that the danger area referred to in paragraph 22(1)(a) is clear of persons;

    • (i) take cover outside the danger area referred to in paragraph 22(1)(a);

    • (j) fire the shot;

    • (k) subject to sections 28 and 29, wait at least five minutes before the shotfirer returns to the area of the shot hole to satisfy himself that no dangerous condition has resulted from firing the shot; and

    • (l) measure the concentration of flammable gas in the general body of the air in the area of the shot hole.

Single Shots

 Subject to section 27, each shot hole shall be charged separately and each shot shall be fired singly.

Multi-shots

  •  (1) Subject to subsections (2) to (4), rounds of shots may be fired in shafts, development drivages, cross-measure drivages, intake and return brushings of longwall faces and repair brushings.

  • (2) Not more than 12 shots in a round may be fired simultaneously using the shortest millisecond-delay detonators.

  • (3) A round of shots using different millisecond-delay detonators shall not be fired unless

    • (a) the concentration of flammable gas in the general body of the air in the area of the shot holes and in any area contiguous thereto does not exceed

      • (i) where the period between the detonation of the first shot and the detonation of the last shot is calculated not to exceed 0.2 second, 1 per cent, and

      • (ii) where the period between the detonation of the first shot and the detonation of the last shot is calculated to exceed 0.2 second but not to exceed 0.75 second, 0.8 per cent;

    • (b) the mine manager has issued to the shotfirer for each area of firing a copy of the shotfiring pattern that shows

      • (i) the position and direction of every shot hole in the round,

      • (ii) the maximum quantity of explosive to be used in each shot hole, and

      • (iii) the maximum length of each shot hole; and

    • (c) the maximum period that may elapse between the detonation of the first shot and the detonation of the last shot is

      • (i) where the shots are fired in a development drivage that contains no seam of coal exceeding 300 mm and that is more than 5 m from a waste or fault, 0.75 second or less, and

      • (ii) in all other cases, 0.2 second or less.

  • (4) A copy of the shotfiring pattern for each area at which multi-shot firing is carried out in a mine shall be kept available above ground at the coal mine for examination by employees.

Misfired Shots

Single Shots

  •  (1) Where a single shot misfires, the shotfirer shall, in the following sequence,

    • (a) remove the handle or key from the blasting machine and disconnect the blasting machine from the shotfiring cable;

    • (b) twist the ends of the shotfiring cable together at the blasting machine and isolate them from ground;

    • (c) wait 15 minutes;

    • (d) examine the shotfiring cable and connections for any defects and remedy any that are found; and

    • (e) make a further attempt to fire the shot using either the same blasting machine or another blasting machine that is suitable for the purpose.

  • (2) Where the attempt to fire the shot referred to in paragraph (1)(e) fails, the shotfirer shall, in the following sequence,

    • (a) remove the handle or key from the blasting machine and disconnect the blasting machine from the shotfiring cable;

    • (b) twist the ends of the shotfiring cable together at the blasting machine and isolate them from ground;

    • (c) wait 15 minutes;

    • (d) mark the location of the detonator lead wires of the misfired shot;

    • (e) cause a new shot hole to be drilled at a distance of not less than 300 mm from the loaded shot hole and parallel to and equal in depth to that shot hole; and

    • (f) fire a shot in the newly drilled shot hole.

  • (3) A shotfirer shall wait for five minutes after firing the shot referred to in paragraph (2)(f) and then, where practicable, sort the debris by hand, recover all explosives and detonators from the debris and take them to the structure referred to in subsection 11(2).

Rounds of Shots

  •  (1) Where all of a round of shots misfire, the shotfirer shall, in the following sequence,

    • (a) remove the handle or key from the blasting machine and disconnect the shotfiring cable from the blasting machine;

    • (b) twist the ends of the shotfiring cable together at the blasting machine and isolate them from ground;

    • (c) wait 15 minutes;

    • (d) test the circuit for electrical continuity; and

    • (e) if the test shows that there is electrical continuity, attempt to fire the round using either the same blasting machine or another blasting machine that is suitable for the purpose.

  • (2) Where the test referred to in paragraph (1)(e) shows that there is no electrical continuity, or where the attempt referred to in that paragraph fails, the shotfirer shall, in the following sequence,

    • (a) remove the handle or key from the blasting machine and disconnect the shotfiring cable from the blasting machine;

    • (b) twist the ends of the shotfiring cable together at the blasting machine and isolate them from ground;

    • (c) wait 15 minutes;

    • (d) disconnect the shotfiring cable and detonator lead wires at each shot hole;

    • (e) test for electrical continuity in the shotfiring cable and detonator lead wires;

    • (f) test the blasting machine; and

    • (g) if the tests show that there is electrical continuity, the detonator lead wires and the shotfiring cable shall be reconnected and tested for electrical continuity and a further attempt shall be made to fire the round.

  • (3) Where any of the tests referred to in paragraphs (2)(e) to (g) do not produce the desired result, the shotfirer shall install barricades and post a warning sign in accordance with subsection 31(1).

  • (4) Where a single shot in a round misfires and is recovered, or where a part of a round of shots misfires and is recovered, the shotfirer shall sort the debris by hand, recover all explosives and detonators from the debris and take them to the structure referred to in subsection 11(2).

 
Date modified: