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.
Number of holes and distance drilled for drill bit isolator durability evaluation.
| Isolator | Mine | Holes | Meters (ft) | Status |
|---|---|---|---|---|
| 1 | C&D | 253 | 629 (2,060) | Functional |
| 2 | B | 301 | 815 (2,674) | Failed |
| 3 | B | 314 | 841 (2,760) | Failed |
| 4 | B | 291 | 710 (2,328) | Failed |
| 5 | B | 291 | 710 (2,328) | Functional |
| 6 | E | 88 | 107 (352) | Failed |
| 7 | E | 243 | 296 (972) | Failed |
| 8 | E | 62 | 76 (248) | Failed |
| 9 | E | 143 | 174 (572) | Failed |
