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Sunday, 7 January 2018

ORE CHUTE


PURPOSE OF ORE CHUTES
·         Chute is a narrow opening in mine workings through which ore is loaded in to mine cars
·         The term also applied to a box like structure equipped with controlling gate fitted to such openings.
DESIGN OF ORE PASS AND CHUTE
·         The shape of the funnel or cone depends on the fragmentation obtained during blasting which may form fridge at the mouth and it should be kept as wide as possible
·         The ore passes should be straight or spiral when seam is highly inclined so that they do not come straightly from top to bottom reducing the breakage of chute sides
·         The inclination of ore chutes depends on mechanisation or draw point has to be installed
TYPES OF CHUTES
1.       Direct discharge type with gate
2.       Chutes with feeders /vibrators
2.
Direct discharge type chutes:
·         In this type ore moves through the haulage level by gravity
·         When the gate is opened manually or mechanically
·         It has low capacity per shift of loading
·         The loading capacity of this chute is 250t/shift
Chutes ith feeders:
·         Ore moves through mechanical osilators
·         Moves at a rate of 2000/3000osilations /minute
·         The loading capacity up to 500t/shift
Finger raise:
·         Used for transfer of ore
·         Used in several cross section raises of short length that branch together to the same delivery point
Draw point:
·         Place is located at the bottom of stoping area
·         Ore can be loaded manually machines in to tubs or mine cars
·         Has no controlling gate
LOCATION OF ORE CHUTES
·         Located at the bottom of ore bin
·         Located at in the sill pillar in over hand stoping
·         Located in the raise, winze connection.  Raise winze connection sometimes used for drawing the ore
FACTORS DECIDING DESIGN FEATURESOF ORE CHUTE/ORE PASS
·         Inclination of ore body
·         Availability of fragmented ore
·         Method of stoping
·         Mechanization of loading and transport
·         Production rate
·         Availability of constructional material
·         Life of stope
·         Stability of lower level
·         Grade of ore