WINZES

WINZES

1. ·         Winze is down ward drivage from upper level to lower level
2. ·         This is a connection from upper level to lower level
3. ·         Winze driving is difficult
4. ·         Costly
5. ·         Slow process
6. ·         Small size drivage
7. ·         In good ground no supports are required for winzes
8. ·         In weak strata supports are required in week strata
9. ·         Steep dips track is laid by blasting the floor
10. ·         Raise winzes connections are carried away in same time to complete the excavation as soon as possible
11. ·         Distance apart between raise winze connections are 25 to 30 m
12. ·         Method of stoping
13. ·         Uniformity of value of ore
14. ·         For regular values these are placed 100-200m
15. ·         For irregular value of ores /higher grade ores raise-winze connections are placed at shorter distances of 20-30m

PURPOSE OF WINZES

1. ·         USED FOR
2. ·         Sampling
3. ·         Access
4. ·         Ventilation
5. ·         Lighting
6. ·         Drainage
7. ·         Exaction of ore
8. ·         Stoping
9. ·         Used for intake and return air ways
10. ·         Travelling roads
11. ·         Haulage roads
12. ·         Material supply
13. ·         Raising out puts

MERITS OF WINZES:

1. ·         Drilling is easy
2. ·         Drilling efficiency increases

DE-MERITS OF WINZES:

1. ·         more holes are required for blasting
2. ·         Gravity not assist for breaking
3. ·         Water accumulate
4. ·         Rate of advancement of face is slow
5. ·         Face is not readily available for blasting
6. ·         Inspection of face is difficult
7. ·         Misfires are not easily detected
8. ·         Poor efficiency of blasting occurs
9. ·         Pumps are required
10. ·         Face will not  be cleaner
11. ·         Driving is difficult
12. ·         Loading is difficult
13. ·         Poor ventilation