Lesson 3 – Cousin Jack Box Installation And Construction

INSTALLATION OF COUSIN JACK BOX

• Conduct a risk assessment
• Inform loco crew of work to commence, place stop block on rails 10m on both side of working area
• Rectify all hazards originated from the risk assessment
• Close opening above area where cousin jack box must be installed with means of laggings/agro props and wire mesh
• Determine the hopper height, width and distance from the box to be constructed for positioning of elongated mine poles and shoot to be installed.
• Install vertical elongated pre stress mine poles (150mm) no 1
• Install elongated pre stress mine poles (150mm) at inclination no 2
• Install horizontal timber for shoot support no 3
• Install box liner with gum planks on top of horizontal timber (3)
• Install gum planks on left and right side, nailed to inclination mine poles (2)
• Close opening between hanging wall and box construction with gum planks no 4
• If the construction of the shoot is ≥ 40° then the shoot must be closed on the top with gum planks, spacing will be left between the gum planks to remove obstructions.
• Install steel J-Bar on both sides nailed to gum planks
• Insert gum planks onto J-Bar
• Demarcation of box front must be done by installing 25mm hoses with reflective tape hanging on both sides 3m from the box.
• No illumination required at cousin jack box’s

INSTALLATION OF COUSIN JACK BOX

• Required PPE , gloves and dust masks
• Position hopper in front of box front
• Sprags hopper wheel with chain
• Box operator to stand on shackle side of hopper and not in line with box front
• To elevate gum plank at J-Bar
• To control flowing of ore with gum plank
• In case of obstruction in box shoot, place gum plank at J-Bar in position Personal must position himself next to box shoot and not in front of box front
• Remove obstruction in box shoot with use of a pinch bar fitted with a gasket. Pinch bar length required will be determent by the available spacing at the box front
• After filling the hopper, ensure that the gum plank are in correct position at the J-Bar
• Clear any spillage in surrounding are of box front

PROCEDURE ON COUSIN JACK BOX OPERATION