Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Roof pre-splitting parameters for the 10202 gob-side entry retained.
| Parameters | Value |
|---|---|
| Pre-splitting depth | 13 m |
| Dip to the goaf angle | 15° |
| Borehole spacing | 500 mm |
| Borehole diameter | 50 mm |
| Explosive type |
No.3 emulsion explosive |
|
Charge quantity in a single borehole |
5.6 kg |
| Detonation method | Direct priming |
| Sealing length | 2.5 m |
