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Sunday, 7 January 2018

DRIVES:

  1. DRIVES:
  2. ·         Drive is a under ground road way driven along the strike
  3. ·         They may be driven in Ore, Footwall, Hanging wall
  4. ·         Drainage channel is cut on one side or both sides of the floor to flow water
  5. ·         Small reef drives are usually 1.2mx 1.8m which can accommodate half ton trucks with single track
  6. ·         Drives are 2.1mx 2m to accommodate one ton trucks with single track
  7. ·         Locomotives nessaciates extra height
  8. ·         Drive with double track for one ton trucks will be 4m x 2.4m
  9. ·         When driving  a reef drive , on the orebody the hanging wall should be cut as little as possible
  10. ·         If the width and dip allows the floor of the drive is kept in foot wall
  11. ·         Then the track is un-effected by future stoping operations
  12. ·         Drives are kept at a gradient of 1 in 100 to 1 in 200 towards the dip side
  13. ·         Main purpose of keeping the gradient are for drainag and transport of loaded trucks

PURPOSE OF DRIVES
  1. ·         Access
  2. ·         Sampling
  3. ·         Removal of broken rock
  4. ·         Transportation
  5. ·         Ventilation
  6. ·         Drainage
  7. ·         Passage of intake/return air
  8. ·         Travelling road way
  9. ·         Haulage way
  10. ·         Carrying pipe lines
  11. ·         Carrying electrical cables
  12. ·         Stoping/extraction

CONDITIONS UNDER WHICH THE INITIAL HAULAGE IS LAID ALONG THE PLANE OF THE ORE BODY(FOOTWALL) DURING MINE DEVELOPMENT
FOOT WALL DRIVES
  1. ·         Foot wall drives required usually in deep mines
  2. ·         To maintain constant direction of roads
  3. ·         To resist the direct pressures from the stope on drives
  4. ·         The ore body is connected by cross cut roads and raises and winzes
  5. ·         The cross cuts serves as chutes for withdrawing the ore from stopes at the time of stoping
  6. ·         Foot wall drives required usually in deep mines
  7. ·         To maintain constant direction of roads
  8. ·         To resist the direct pressures from the stope on drives
  9. ·         The ore body is connected by cross cut roads and raises and winzes
  10. ·         The cross cuts serves as chutes for withdrawing the ore from stopes at the time of stoping

purposes of driving the haulage inclines are laid in foot wall
  1. ·         For access
  2. ·         For sampling
  3. ·         Ventilation
  4. ·         Hauling outputs
  5. ·         Supply of materials
  6. ·         Drainage
  7. ·         Passing intake/return air
  8. ·         Lighting
  9. ·         Laying electric cables/pipe lines

Conditions under which haulage inclines are laid in foot wall
  1. ·         Ore situated at deeper depths
  2. ·         Ore present at disturbed zones
  3. ·         Ore present at high stress areas
  4. ·         Getting more production
  5. ·         Mine has to withstand for long periods of life
  6. ·         Adopt mechanization
  7. ·         Need quick transportation of out put
  8. ·         Easy maintenance of roads

MERITS OF FOOTWALL DRIVES
  1. ·         Uniform gradient of roads
  2. ·         Roads in constant direction
  3. ·         Higher out puts
  4. ·         Large scale mechanization possible
  5. ·         Higher tramming speeds
  6. ·         Less maintenance cost
  7. ·         With stand main entrances for long life
  8. ·         No problem of roof control
  9. ·         Less water accumulation
  10. ·         Smooth flow of air in uniform roads is done
  11. ·         More safe for men and reserves
  12. ·         Employed in deep mines

DEMERITS OF DRIVES IN FOOTWALL
  1. ·         Country rock is harder than ore , difficulty in drilling
  2. ·         More consumption of explosives occurs
  3. ·         Slow rate of face advancement
  4. ·         High cost of drivage
  5. ·         Quick return can not be possible
  6. ·         Capital held up
  7. ·         More investment
  8. ·         More time for development