ORE PASS

1. ·         The ore passes are unlined ,located in country rock
2. ·         When they located in back fill ,they are constructed with square or hexagonal wood crib reinforced with
3. ·         angle iron wear plates or of round steel liner plate
4. ·         In some mines lined ore passes with steel fiber reinforced shot crete, they are holding up very well
5. ·         The choice of lining depend upon
6. ·                Type of rock
7. ·                Length of ore pass
8. ·                Estimated tonnage will flow through ore pass
9. ·         Short unlined ore passes 30m or less in length,
10. ·         In hard tough country rock ,properly stand up under constant passage of ore
11. ·         The bottom of the ore pass in haulage level contains loading chute lined with steel plate equipped with pneumatically operated gate
12. ·         The ore loaded in to trucks or trains 3-12 ore cars
13. ·         The mine cars dumped at main ore pass which usually located at haulage shaft
14. ·         The ore bins and main haulage drives are not provided at every level
15. ·         Ore passes are necessary down which the broken ore can gravitates from the non hoisting levels above
16. ·         If the dip of the ore body is greater than 45° ordinary raise winze connections may be employed for ore pass for transferring the ore With lower dips, to drive a special pass which have sufficient slope, with cross cuts leading to them.
17. ·         Instead of using loading chute the ore may be dropped in large area beneath the ore pass
18. ·         The ore is then loaded in to ore cars or trucks using LHD unit or Over shot loader
19. ·         The ore may be hauled directly to the main ore pass by a Load haul dumper

PURPOSE OF ORE PASS

1. ·         Main purpose of ore pass is used to transfer the ore from one level to other by gravity alone
2. ·         To feed the ore bin provided at lower most level

TYPES OF ORE PASSES

1. 1.       BASED ON LENGTH
2. 1.                Short ore passes
3. 1.                Long ore passes
4. 2.       BASED ON LINING
5. 2.                Un lined ore passes
6. 2.                Lined ore passes
7. 3.       BASED ON USE
8. 3.                To pass the ore
9. 3.                To passes the waste rock

LOCATION OF ORE PASSES

1. 1.       Located in ore
2. 2.       Located in country rock
3. 3.       Located near the ore bin to feed the bin