Underground Ground Control Major Hazard Standard - MIRMgate

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Major Hazard StandardUnderground Ground Control** Uncontrolled copy. Use latest revision **The Mine Manager or the delegate shall review andupdate the layout plans as required.3.2.3 Workplace Inspection and ReportingThere shall be regular inspections of the workplace toidentify and report hazards. The Shift Supervisor:• Shall inspect each underground workplace at leastonce in each shift to ensure that work is beingconducted as specified in the Shift and Work Plans• May make more frequent inspections, dependingupon the regulatory or management requirementsof the system under which the mine operates• Shall report hazardous conditions identified duringthe inspection using the Ground HazardIdentification and Control System.3.2.4 Hazard Identification and Control SystemTo record, report and control hazards identifiedduring visual inspections there shall be a HazardIdentification and Control System in place that:• Identifies indicative or site specific conditions thatmay indicate a hidden hazard• Indicates nature of hazard at the time it wasidentified• Defines the action to be taken for certain specifiedconditions• Provides details of all identified hazardousconditions, whether acted on or not, for inclusionin the Ground Conditions Model• Requires feedback to initiator if hazard is fixed byanother person.The Ground Control Co-ordinator shall use a GroundHazard Identification and Control System to record,report and monitor ground control requirements.(see Appendix E Example of a Ground HazardIdentification and Control System)The information from the Ground HazardIdentification and Control System shall be used forplanning and design of ground-control measures.The Ground Control Co-ordinator, Shift Supervisorsand the managers of Ground Control Operators shallbe familiar with the system and the GroundConditions Model.The Ground Control Co-ordinator shall coordinatethe Ground Hazard Identification and ControlSystem.3.2.5 Ground Conditions ModelThere shall be a Ground Conditions Model for themine which can display the information collected inthe geotechnical data base and that enables the minemanagement to build a record of ground conditionsencountered at a mine to:• Check, modify and review ground support andreinforcement plans and the Ground Control Plan(e.g. optimisation, safety)• Gather information for subsequent miningactivities in previously developed areas• Gather information on stability problems soexposure to hazards can be managed.The following points relate to the construction of theGround Conditions Model.• The Ground Conditions Model should be based oninformation contained in the Ground Control Planand updated with information from the various datagathering methods• The recording system for the Ground ConditionsModel should be selected to suit the mine and mayrange from simple two-dimensional plans withoverlays to complex three-dimension plans on aCAD package• The complexity and number of componentconditions recorded in the Ground ConditionsModel should suit the mine. Examples ofcomponent conditions are:– Structural geology (e.g. blocky, jointed, layered)– Rock Mass Quality Rating (e.g. red, green, 1 to10, Q or RMR)– Blast quality (e.g. overbreak, damage, problems)– Installed ground control system (e.g. standardtype 1, 2, 3 etc. or blue, green, red etc.)– Adverse ground conditions (e.g. excessive scats,rockfalls, water, rock bursts, stress).The Ground Control Co-ordinator shall beresponsible for developing, maintaining andmonitoring the Ground Conditions Model.4 Ground Control Tasks4.1 Mandatory Requirements for WorkConducted in a MineThe following requirements are mandatory for anywork conducted in the mine:• No person is to go beyond supported ground,i.e. ground supported or reinforced to an approvedstandard for that rock type and made safe• No person is to enter an area without theknowledge of the Shift Supervisor or withoutrecording his/her location in a Location RecordSystem to which the shift supervisor has access.The information should be provided either prior tothe shift commencing or during the shift and inaccordance with any hazard signage procedure inplaceSAF-MHS-01 Rev. 1 DOCS No. 55945 Issued: 19/06/00 Page 9 of 23
Major Hazard StandardUnderground Ground Control** Uncontrolled copy. Use latest revision **• As hazards are identified during any task in thework cycle, scaling or other appropriate actionshall be taken immediately• Personnel shall not be allocated or undertake tasksfor which they have not been assessed ascompetent by the Mine Manager or nominateddelegate, unless they are working under directsupervision of a competent person.4.2 Re-entry RequirementsPrior to accessing inactive areas or followingproduction or development blasting there shall be are-entry procedure that includes;• Visual inspection• Watering down and dust suppression• Scaling4.2.1 Visual inspectionWhen entering a heading, personnel shall completethe following actions:• Check the visibility; if the excavation surface is notvisible, personnel shall not enter• Look for evidence on the floor of rockfalls• Look for loose rock between rock bolts• Inspect the previously installed ground support andreinforcement• Look for any signs of rockburst or high stressconditions• Look for loose material behind vent bags andobstacles• Look for and obey the instructions implied bybarriers.4.2.2 Rise and Slot Inspection• Travel shall be from above rather than below,where practicable• Persons who are permitted to enter a rise shall be:– The miner assigned to that rise– Any other person authorised in writing by theUnderground Manager for the purpose of makingthe rise safe– Other persons, only if the rise miner or anauthorised person is present and then only withthe knowledge and consent of that person4.2.3 Watering Down and Dust Suppression• Initial watering down and scaling of an excavationafter blasting shall be from a supported and safelocation• If rock burst or heat conditions are identified in theGround Control Plan or by observed groundconditions, a special SWP shall be developed forwatering down and scaling in these areas• Service crews shall be provided with guidelines forinstalling valves and hoses; the guidelines shallinclude the inspection of the installation area forrockfall hazards.4.3 Scaling• Boggers shall not be used for scaling the backs ofthe excavation. The bucket may be used to push-offrocks on the walls provided the rock is no higherthan the mid point height of the cab of the loader.In using this technique, in addition to the safetyaspects, the consequences of possible damage tothe loader must be considered. Use of a bogger toscrape the walls shall not be the sole or finalmethod of scaling; manual sounding and scaling isthe final method• Hand-held drills shall not be used for scaling• The SWPs relating to scaling shall notunnecessarily expose existing and required groundsupport and reinforcement to damage from thescaling process• There shall be a process in place to repair orreplace ground support and reinforcement damagedby scaling.The above requirements shall also apply to thescaling activities specified below.4.3.1 Jumbo Scaling and Scaling Machines• Equipment shall be positioned so that there is anadequate and safe retreat and work area• Scaling shall be conducted from a safe area whileadvancing to the face• Booms should be kept to a minimum angle toreduce the risk of a rock bouncing into the cab• Personnel shall not approach past the rear of thejumbo or scaling machine while it is operatingwithout the consent and knowledge of the operator• Use of a jumbo or a scaling machine shall not bethe sole or final method of scaling; manualsounding and scaling is the final method, unless theGround Control Plan specifies an alternativemethod of scat control e.g. mesh or shotcrete.4.3.2 Scaling from a Platform• There shall be a system to enable continuouscommunication by visible signals or verballybetween personnel in the platform and theequipment operator• The use of platforms shall comply withSAF-MHS-08 Safe Working at Height• Only one person on a platform shall scale at onetime• Hydraulic lines on a platform lifting mechanismshall be inspected before and after use of theplatform by the operators.SAF-MHS-01 Rev. 1 DOCS No. 55945 Issued: 19/06/00 Page 10 of 23
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Underground Ground Control Major Hazard Standard - MIRMgate

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