 |
| |||
| transverse slot (Schraubenkopf); barbican; cross-drain; scarp wall | |||
| channel across the supposed ore zone (zur Probenahme) | |||
| cross drain | |||
|
| |||
| transverse slot (Schraubenkopf); barbican; cross-drain; scarp wall | |||
| channel across the supposed ore zone (zur Probenahme) | |||
| cross drain | |||
