I wonder how it may have affected earthquake passage?
Read the thread!
As one of the first people into Earthquake passage we put in some tell-tales to check if there was any movement as it looked, of course, like it might go at any moment.
Over two years and a previous tremor - it didn't move!
That's not to say it won't go now. All I can say it was in our minds as we moved around in the bottom of the stope some 100' below it.
Incidentally - has anyone been down there lately? - off the end of the passage, descend several pitches, across the stope and then down the slope to the flooded bit right at the bottom.
The finest workers in stone are not copper or steel tools, but the gentle touches of air and water working at their leisure with a liberal allowance of time.
Henry David Thoreau