MINING METHOD

First-aid  station is a place fixed by the manger for rendering first-aid to person injured.Every first-aid station is provided with equipment as prescribed in the Third schedule of mines Rules namely: a stretcher and two blanket,Sets of splints(1.4m,0.9m,0.3m,)and sufficient tringular bandages.First-aid boxes(or cupboards),one per150 person,containin sufficient supply of large and small dressings and burn dressings,sufficient supply of sterilised cotton and adhesive plaster,roller bandages,Dettol or other antiseptic solution,a tourniquet,scissors and safety pins,soap.                                                  First aid station shall be provided at the following places On surface:-                     At pit top/incline mouth.In workshop,screening plant and    ...

  Arrangements for first-aid                               According to mines rules1955,the following arrangements are made for first-aid in mines: First-aid Room on surface      First-aid station at specified place on surface,in opencast mines and in underground working.First-aid out fit with every overman,mining Sirdar,shotfirer,fitter and electrician.Ambulance van                    First-aid training to maximum number of employees, and refresher training to first-aid certificate holders.

  Steel supports:-                                                                In devlopment and de-pillaring districts these districts    these days,mainly 3types of supports are used: pit props,steel chocks/cog stools,roof bolts.      pit props  :                                                                       pit props are hollow steel props at the end of which a shorts length of wood has been hammered.They are light,can be transported easily from one place to another and convenient because their length can be varied easily as required.      Steel choc...

recautions to Prevent spontaneous heating Depilliaring                                            Depillaring with panels of such size that extraction can be completed within incubation period.Blasting the stools/ribs lefts in goaf to ensure regular fall of roof and goaf consolidation.Minimising coal left in the goaf.In BG panels,injecting CO2 or N2 from time to time.Not leaving stowing lag in goaf.  Sealed goaves - Good construction,regular inspection and timely maintenance of isolation stopping.Keeping pressure differential across sealed off areas low to prevent leakage of air.Blanketing the surface over goaves panel.Crack filling and consolidation from time to time.Regular air sampling and analysis to keep a watch on conditions in sealed off area.    Unsealed developed workings              ...

  Two main types of fencings used below ground are U-1 and U-2.                                      U-1  Wire ropes(or rope strand,barbed wires or rollas)nailed to vertical props set flush on sides of the gallery.Gap of bottom most member from floor 0.25m, between other members 0.3m,top not less than one meter from ground. U-2  fence is used at :Goaf edges, areas of roof fall ,place of misfire ,place of accumulation of gas,Site of accident. It consists of two wire ropes(or rope strands,barbed wires or wooden rooles)fixed with cement in sides of pillars across the gallery at a height of about 0.6m and 1.0m respectively. U-2 is used at entries to disused galleries.

  At every underground mines fire fighting plan is to be kept maintained,and a copy thereof posted in the mine office and at convenient places below ground.This plan is like a ventilation plan of the mine showing in particular the following:  system of ventilation of the mine,Position of fire fighting equipment,I.e    -fire station(with details of equipment);              -pumping station,water pipe lines and taps. Emergency exit routes.  Places vulnerable to fire,such as electrical sub stations,belt conveyor drive heads,place where inflammable materials are stored.The plan shall be kept up dated.Persons trained in fire fighting shall be made conversant with this plan.

  Send information to: overman/mining sirdar of other districts to withdraw men to surface the surface particularly the manager any senior official who may be present u.g. When possible,the information shall be given over telephone.On development of spontaneous heating in the goaf,a peculiar oily,sweetish or petrolly smell is found in the return airway.Withdraw men from the mine,and send them out through intake airway and downcast shaft,without creating chaotic conditions keeping underground only the minimum persons who may be required for dealing with fire e.g. line mistris and helpers timber men and helpers, mazdoors etc.Cut off electrical power of the district arias.Engage men retained u.g.in preparatory works for sealing off the fire.Take care of their saftey.At end of the shift,write a detailed report in the bound paged book kept under Reg114 and confer with the manger or asstt.manager.No person shall be re admitted,except for dealing with the fire,until the fire e...

Every walkable entrance from surface shall be provided with a substantial gate.The gate shall be kept closed and locked when there are no person below ground. Entrance not in use for entry or exit shall be permanently closed in a manner to effectively prevent person from entering.                                                                            portion of excavation within 15m of a public road or any building,surface areas which have subsided,and surface areas likely to subside,shall be kept securely fenced.              Entrance to-  shafts  staple pits  sumps goaves,and   other dangerous places shall  be provided with a fence,barrier or gate which will effectively prevent person entering or falling therin. Entrance fr...

  No person shall be employed or be permitted to enter or remain for purposes of employment,in any Working below ground unless the working is provided with at least two shafts,incline or other outlets to the surface.with which every seam or section for the time being at work has a communication so as to afford separate means of ingress and egress to the persons employed therin; which do not have their surface opening in the same bulding and which are under the sole control of the manager:                                                                            Provided that the chief inspector may by an order in writing and subject to such conditions as he may specify therein,permit the employment below ground if person even in a case where the two shaft,inclines or outlet are not under the co...

 * Why galleries are sometimes staggered?              (1)It will help to install transport system   (2)to avoid excessive exposure of roof at a place  (3)to provide good support to the roof (4)it will be give maximum coal output.                                                                                                                       * What is the expected range of LBC of a 2.5m long,15cm diameter timber prop?                            (1)5-10kn  (2)50-60kn  (3)15-20kn (4)120-130kn                  ...