The east crew did not enter the working face on its last scheduled shift. Before the bell, foreman Uldra Ker and two miners compared the iron markers above the second brace with the soundings book. The marks were not enough to establish movement, but they did not line up closely enough to clear the face on the usual reading alone.
Ker asked the survey office to repeat the measurement from the opposite wall. The crew marked the limit on the access board and moved its tools back to the old cart rail. The pause applies to the East Seam face; it does not close the other galleries or the route used by maintenance crews.
The survey office said its first reading had been taken under a single lamp and would not be treated as a finding of instability. A second instrument is being brought to the face so that the new iron markers can be compared with the older slate marks.
For the miners, the uncertainty is practical. A reading can tell them that a mark changed without telling them whether the change is in the rock, the instrument or the way the mark was copied. Until the repeat is entered, the crew has been reassigned to timber checks away from the face.
