MINING METHOD

The manager of every mine in which a mechanical ventilator other than an auxiliary fan is installed,shall submit to the Regional Inspector,within 60days of the coming into force of these regulations,or in the case of a new installation within 30days of the installation,Standing orders specifying the action that shall be taken with respect to the withdrawal of persons from the mine or part thereof in the event of a stoppage of the ventilator.                                                                           The Regional Inspector may,by an order in writing,approve of such standing Orders,either in the from submitted to him or with such additions and alterations as he may think fit,and the standing orders so Approved shll be enforced at the mine.A copy of the standing orders shall b...

Various types of devices used for initiating explosive are called BLASTING ACCESSORIES; example:-Saftey fuse,detonating fuse,Nobel,Raydet, detonating relays,coard relays,circut tester,crimper,shot firing cable,exploder.                                              SAFETY FUSE:-  Looks like cord consist of a core of fine grained gunpowder wrapped with layer of a tape and water proof coating.Burning speed of safety fuse is 100to120sec/meter.                                                                    DETONATING FUSE:- Such as cardtex and geocord detonating fuse.The detonating fuse looks like a plastic cord,it's external dia is about5mm.and weight about 20gm.per meter length.Its velocity of detonat...

O.M.S means output tones per man per shift.It is a method of Expressing the productivity of mines of loader.**Condition of longwall method:-Seam thickness-0.6to2.4m.Moderate depth. Inclination-flat to20*Depth-More than500m.InL/W working with coal plough,seam thik ness is 0.6m to 2m. Ploughability of coal seam determine as Per ISI( impact strength in Dex) . Where coal is hard in this case water in fusion of the coal face proceed the ploughing operation.Whater infusion is a process of drilling 1.2m to 1.5m.deep holes spaced 3to 6m interval along the direction 45*to it, pressure forseing water 6to10kg/cm2 through them.#Machinanised used in mechansid L/W face" DEARD,DEARD,SHEARER,AFC,POWERED Support,gate belt conveyor,stage loader,In seam miner,Road header..

 * Which diagram explains the limit of explosibility of CH4?                                              (1)coward  (2)le chetelier  (3)Graham's  (4)palvalov                                                                                                                                                 * The delay between the ignition and the application of the heat source termed as          (1)lag on ignition  (2) incubation period  (3)saturation per...

Inspection of haulage and travelling roadways    All haulage and travelling roadways and roads including roadways leading to all the outlets of the mine which are in use shall be inspected by an overman atleast once in every 7 days.A report of every such examination shall be recorded in a bound paged book kept for the purpose and shall be signed and dated by the person who made the examination.  Items of inspection r haulage roadways  Roof and sides are secure. Roadways is white washed.Junctions and coupling/in coupling points are lighted.Manholes are clear and free from obstruction.No material has been dumped/stacked by the side of track.Water is properly channelised.Signalling wires are properly supported.Track sleepers are properly nailed,track is properly graded and packing is ok.There are no missing roolers,diversion pulleys.Track rollers/pulleys are oiled,and not jammed.Stop blocks,runways switches,tub retailers,buffers and other safety devices are ...

  Emergey plan is a general program of action to be followed in the event of fire,explosion, inundation or other emergency in the mine for dealing with the situation effectively and efficiency.                                                                                It is includes duties and responsibilities of mines official,keyman and telephone operator so that every such person knows what is expected of him in the event of an emergency in the mine.                                                    It is prepared by the manager and enforced at the mine after approval by the Regional inspector.It is kept ready at every underground mines. ...

Ful l production may be attained rapidly with little development work. I n L/W ADVANCING all the seam section is extracted in one operation,so a maximum degree of extension can be achieved. High  degree of roof control can be obtend by sutable method of packing or caving. The  good ventilation system is mantaion than board and pillar method. The  method are suitable for seam with dirt band which is utilised for extaction of pack well.

The demensions of pillar and galleries and the shape of pillar,formed in any seam or section shall be such as to ensure stabilty during the formation and extraction of pillar and during the period between such formation and extraction.Save with the previos permission in writing of the regional inspector and subject to such conditions as he may specify therin no gallery ina seam or section shall exceed three meter in hight or4.8meter in width at any place.The pillar formed in any seam or section shall normally be rectangular in shape.The distance between the center's of any two adjacent pilar left in seam or section shall not be less than that specified in the appended table as corresponding to the depth of the seam or section form the sureface at that point and the width of the gallery in the working in question.

An accident causing loss of life or serious bodily injury in connection with mining operations.an explosion or iginition,a spontaneous heating or outbreak of fire,or appearance of smoke or other indication of heating or outbreak of fire;an influx of noxious gases,an occurrence of inflammable gas in mine to which regulation 144 does not apply an irruption of water an instantaneous failure of pillar,part of a pillar or several pillar of coal in working below ground .an overwinding of cages or other means of conveyance while men are being lowered or raised.A breakage or fracture of an essential part of winding engine, crankshaft, coupling,bearing,gearing,clutch,drum shaft or failure of emergency break.a bursting of any equipment containing steam compressed air or other substance at high pressure or a breakage fracture or failure of any essential part of any machine or apparatus whereby the Saftey of person may be endangered.

When the owner agent or manager intends or proposes,by introducing water from the surface or from any other part of the mine,or from an adjacent mine,to flood any part of the working of his mine,he shall give,in writing not less than 14days notice of such intention or proposal to the chif inspector and the regional inspector and to the management of all adjoining mines and of such other mine as might by such flooding.Provide further that the regional inspector may by an order in writing,either prohibited any such operation or require that such operation shall not be commenced untill such precautions,as he may specify,have been taken to his satisfaction.

  BLAST HOLE DRILL:                                                                               Roller bit drill cuttings are flushed out by compressed air is known as blast hole drill.In our country 150,260and310mm dia.electric blast hole drills are commonly used in opencast mines.Blast hole drill are crawler mounted.By adding drill rods one after another deep holes can be drilled.For dragline benches 40m or even longer holes are required.Feed mechanism of the drill is by hydraulic pumps.Drill rood is fitted in a long mast.For adding drill rods or for bit changing rod changer or carousel of the machine is used.Rod length is generally 10-12m Depending on the model,the machine can drill holes of upto 3-5rods.Blast hole drills are equipped with 3hydraulic jack for leveling the m...

Overman's report book is generally a printed book.It is a bound book and the pages are serially number. After filling up details like name of mine,seam,district, date/time of inspection and parts visited,he write a report on the following topics (A to M).                                          A  .Saftey material:- supply made during the shift and whether the stock u.g.is adequate. Material required.                      B. ventilation appliances:-condition,any deficiency,Any stopping,brattice,or air pipe lagging behind(give particularly),Any  re circulation of air by auxiliary fan, Deficiency in use of safety lamp by mining sirdar/shotfirers/other competent person,%of inflammable gas detected,name of face,action taken.              C. Haulage:Saftey divices and appl...

The  Board shall consist of the Chif Inspector who shall be it's chairman ex-officio and five members prossessing tecnical qualification in mining and having practical experience in coal mines,or serving in an institution imparting education in mining engineering at the degree or equivalent level and engaged in mining research.Present all important papers and matters to the Board as early as possible,isue orders for carrying out the divisions of the board have power to refer in his discretion any matter to the central Government for their order and have powers generally to take such action or pass such orders as are necessary to implement the desision of the Board.

  Highest flood level (HFL) When it rains water level of river or jore rises and water spreads on both sides.The rise varies from year to year.The highest level in known history to which water has risen is known as highest flood level or HFL of river/jore.The outer border to which the water spreads on either side is called highest flood line.If there is river or jore near the mine,HFL305m(5.10.2006).It gives an idea of the extent to which the water can spread so that Safety of mine entrance can be ensured.HFL is painted on a concrete pillar built on the surface.Every year durring rainy season the surveyor checks whether the water level has risen to a level higher than HFL,and if so,he surveys the HFL line,amends all mine plans accordingly and reveiws the dangers.It is to be noted that HFL line is not a contour line,In different mines on the same rivers,HFL may be different because width and depth of river may not be the same at all places.

For every 1%reduction in oxygen content,the light of flame safety lamp refuses by about 25%•At about 17%oxygen,the flame gets extinguished.                              A burning flame safety lamp shows adequacy of oxygen,but the atmosphere will not be safe if CO or other toxic gas in present.It is for this reason that regulations provide that while going for inspection of old working it is essential to carry flame safety lamp a part from birds or an approved CO detector

Standard  of ventilation :-Not less than6m3/min/person employed in district on largest shift or not less than2.5m3/mm/ton output.Which ever is larger should be pass in the last ventilation connection in the district which means the in by most gallery in the district along which air passes.Oxijen not less than19%co2and other gas not more than ୦.5%•%of inflammable gas:-Not more than0.7%in general body of return air not more than1.25%in any place in the mine.wet bulb temperature not more than33.5°c and where W.B.T exceed 30.5°c curent of air moving at a speed of not less than1m/sec.Air sample and temperature reading shall taken at least once in 30days.                        Main mechanical ventilatior installed one sure face at a distance of not less than 10meter from opening of shaft or incline.Ac/p exaine every mechanical ventilatior once in every 7days.The quantity of air measured once at least every14days for2nd and 3rd ...

Only permitted Explosive used in underground.Such Explosive are always cap sensitive.Non permitted Explosive can be used in under ground metal mines and open cast coal mines.In waterly place gelatinous and semi gelatinous Explosive should be used butNG based powdery Explosive is not used in watery place.Slurry Explosive are water resistant and they can be used in waterly holes but AN based slurry Explosive with a so. gravity of 1 or less shuld not be used in waterly holes.Only Explosive with a high velocity of detonator over 2500m/sec. should be used for blasting in hard rock.Non cap sensitive Explosive should be blasted with the help of detonating fuse.

These are subdivided as- (a) Half second or long delay detonator. (B) Milli second or short delay detonator.                                        Delay detonator having a delay element and provide fuse head and printing charge.  Delay element consist of copper or brass sleeve and fild with antimony and potassium permagnet in case of long dealy element and Red lead and silicon in case of short delay element.Fuse head consist of flasing material,lead mononitro resorcinal(LMNR) potassium chloride,charcoal and collodion coton.In under ground coal mines aluminium detonator are not permitted but only copper detonator should be used.

The owner oragent shall provide accurate and reliable survey instruments and meterial for the proper carrying out of all survey and leveling wok and for the preparation of the plans and section required under these regulations and no other instruments shall be used in connection with in such survey or leveling work.

To ensure that all lamps in the lamp room are maintained properly as per the regulations.To ensures proper maintenance of record of isue, return and maintenance of lamps.To see that lamp room is kept in a neat and tidy conditions.To see that damage and defective gauges,glasses and other part of safety lamp are not kept or stored in the lamp room.To see that fire extinguisher or other means of dealing with fire provided in lamp room are in good condition and readily available for use.To carry out other duties given by manager or under manager or assistance manager regarding maintenance and issue/return lamps.