Underground Ground Control Major Hazard Standard - MIRMgate

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Major Hazard StandardUnderground Ground Control** Uncontrolled copy. Use latest revision **Rise/RaiseRockfall hazardScalingScat removalServiceabilityA vertical or steeply inclined development opening driven or excavated upwardfrom a level in an underground mine. For the purpose of the GCS a rise is adevelopment excavation at an angle greater than 35º. The provisions for ladderrising in the GCS do not apply to hand held stoping methods unless these stopesare at an angle greater than 35º and there is not a means of approaching the facewithout travelling up under the freshly fired faceAn uncontrolled displacement (due to gravity or stress) of material (rock orsupport elements) from the surface of the excavation.Scaling is the action of levering/prising out loose rocks from the backs, walls andface of an excavation. Scaling bars should be made of steel in order to beadequate for sounding the rock and strong enough to lever the loose rocks free.Scats are small (generally up to around 200mm x200mm ) loose rocks which canbe easily removed from the backs and walls of an excavation or from behind themesh by knocking with a scaling or scat bar. Scat bars may be made of lightweight material such as aluminium and of a length such that the backs of theexcavation can be reached with the bar held at an angle of 55º to the horizontal(Using a 3.6m scat bar the maximum height of backs which could be reached is4.5m ). A scat bar shall not be used for scaling and shall only be used to controlscats after scaling has been completed. Removal of scats shall not be consideredas the sole or final form of scaling.Fit for purpose for the required life.Shall, should and may Shall: A mandatory requirement i.e. a requirement that is to be met at all times.For new equipment, processes and systems, this requirement must bemet.For existing equipment, processes and systems, the requirement must beaddressed in an implementation plan which has been approved by theResident Manager or equivalent. There must be evidence of progressiveimplementation according to this plan.Should: An advisory requirement i.e. a requirement that is to be met wherepracticable.Where the requirement is not implemented, the justification fornon-adoption and evidence of an alternative solution shall be provided.May: A discretionary requirement i.e. the person authorised to make ajudgement is to use their discretion.Shift PlanA plan of the activities that will occur during a working shift at the mine, whichidentifies:• Where the activities are to occur• Who is to do what task• What equipment is to be used• What hazards have been identified in the area relevant to the task that is to beperformed.SAF-MHS-01 Rev. 1 DOCS No. 55945 Issued: 19/06/00 Page 15 of 23
Major Hazard StandardUnderground Ground Control** Uncontrolled copy. Use latest revision **SupportedWork PlanControlled to an approved standard and made safe through the appropriate use ofcontrolled blasting, scaling, ground support and ground reinforcement.Each excavation and rock type shall have defined minimum approved supportspecifications (e.g. stable spans, minimum ground support, minimum groundreinforcement spacings and types, specifications for installation, specificationsfor ground reinforcement elements). In certain circumstances ground may beconsidered supported when no ground support or reinforcement is installed. Inthis case a geotechnical evaluation would have been undertaken to determine thata situation does not exist which may possibly result in a rockfall or otherwiseaffect the stability of the excavation. In pre-existing areas of the mine, historicalperformance of the ground would also be considered.A set of work instructions for specific locations in a mine. It usually includes asurvey plan of the proposed work area identifying geotechnical or other relevanthazards.B Related DocumentsSAF-MHS-05Underground Mobile EquipmentSAF-MHS-08Safe Working at HeightSAF-MHS-09Inrushes and SubsidenceSAF-MHS01-R01Ground Control Inspection ChecklistSAF-MHS01-R05Ground Control Ladder Rising ConsiderationsC Revision Information.Revision 2 issued 19/06/00Revision 1 issued 24/05/99Revision 0 issued 12/05/97SectionPurpose and Scope1.1 Producing theGround Control Plan1.3 Determining theMining Method andEquipment Options1.4.1 Major UncontrolledGround Failure1.4.2 Determining the MostAppropriate GroundDifferenceWording amendedDot point eleven add “Ground”Paragraph one and two amended and mergedChanged from “Inrushes”Renumbered and this whole section has been moved from 1.4.4. Wording notchangedSAF-MHS-01 Rev. 1 DOCS No. 55945 Issued: 19/06/00 Page 16 of 23
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Underground Ground Control Major Hazard Standard - MIRMgate

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