Mine Inspection Updates (Nov 2013)

Following last weeks inspection Les has prepared his reports which I’ve now added to each users Google Docs folder. Rhiwbach still requires monitoring however the boating chamber has been cleared for use.

The report also includes inspection of the adits/trials at Geironydd.

Few updates

We have a mine engineer booked in to look ar Rhiwbach on the 15th of November to get a better idea about the rafting brow.

Also, saddly there apears to have been ropes and rigging gear stolen from both Wrysgan and Cwmorthin. If using these mines best take additional kit to rig handlines etc.

Possible movement within the boating chamber, Rhiwbach

Hi All,

I’ve just heard that there may have been some movement within the boating chamber of Rhiwbach, the painted cracks still remain however there may have been some movement on the side wall, and some new cracks in the brow itself. I’ve not seen it myself.

I’d suggest it prudent to avoid the rafting pool until further notice.

Waterworks on the road leading up to Rhiwbach

Welsh Water are conducting work on the road leading up to the parking area for Rhiwbach. The road should remain open and the parking area clear (thanks to Baggy for following that up with WW), however there is likely to be some delays on that bit of road for the next 8 weeks. 

Possible rockfall (small) in Rhiwbach

During a trip in Rhiwbach yesterday we noticed some small fresh rockfall just on the pool and hand-line side of where some scaling down was completed during the 2006 inspection (noted on the inspection mine plan), floor 1.

Although not significant is size there does appear to be some loose rock at head height in that section of the mine, I’d suggest we continue to monitor that area and ensure our groups move swiftly through without pulling on bits of the roof!

Gethin

 

Should we remove the fixed aids (metal rungs) in the airshaft, Rhiwbach?

Poll removed
Dear fellow users of Rhiwbach Slate Quarry
I am writing to hopefully gather your vote on the current use of the airshaft exit from the mine at the top of the hill (the alternative exit to the more commonly used daylight chamber).
You might be aware that the airshaft has not been part of the blue route in the mine until fairly recently. We (Go Below) asked to bring into use as it looked like a more fun and challenging way to finish a trip.
Given that the shaft as it was fell beyond the abilities of most participants to climb, we put a line of holds all the way up. These were small blocks of slate bolted to the face (like those used further down the mine). We also installed a gate at the top, and have more recently placed some meshing over all the loose rubble at the top (following a near miss with a rock sliding down the shaft).
The slate-block holds were particularly nice as they were easy to use and blended in nicely. However, over last winter, many of them fractured and became dangerous due to the water running behind them, and freezing overnight. The blocks were breaking in peoples hands, or when stood on, and falling down the shaft. This was obviously a serious hazard for any others who might be below. (the slate blocks further within the mine obviously do not have this problem, as there is no water and it does not freeze).
We opted, as a bit of a rush decision, to swap the blocks for metal holds, very much like the ones used in the Alps for Via Feratta. They don’t look as nice, and have taken a bit of the challenge away, but they are unaffected by freeze-thaw and therefore much safer. The other disadvantage to these holds is that should you want to abseil down the shaft, rather than climb up it, they are awkward to step over.
The change in the type of hold has received mixed feedback, some positive, some negative. I am therefore putting it out to vote so all users of Rhiwbach can vote whether they should stay or go. Reverting back to the slate blocks isn’t a viable option given the hazard.
Option One: Keep the steel steps, nothing changes. Go Below will continue to maintain them.
Option Two: Remove the steel steps, and leave the airshaft bare.
If you use the airshaft, and wish to cast a vote, please email me [edit] or vote here [edit] and I will tally it up. If the vote is to remove the steel steps, we will do so when we get a couple of free days and will post notice when the work is complete.
I’ll give it a week or so for votes to come in.
With many thanks indeed
Miles Moulding

Rhiwbach Updates (8th April 2013)

Rafting Brow

22 MineReports2013 Rhiwbach Boating Brow PictureFollowing this years inspections (reports will follow soon, just waiting on some final content) we where advised to paint a few cracks in the brow above the rafting pool and monitor them for 3 weeks. The cracks where painted on the 6th of April. We’ll need to monitor the marked areas to see if the brow has stabilised before re-installing the boat trip. Please continue to avoid this area with groups.

Top Entrance

22 MineReports2013 Rhiwbach Top Exit PictureLast week Miles pointed out some loose rock above the top entrance to the mine, most likely a result of the freeze/thaw. Over the weekend we also removed some sizeable blocks hanging above the entrance! Click here to watch some film footage.

The bulk of the loose rock has been removed, and the path leading from the entrance cleared of debris. Having confirmed this with Les Riley (mine engineer), we can continue to use that entrance. However I would advise all groups leaders to monitor the quarry roof, and move groups swiftly away from the entrance/exit.

Thanks to both Sharon and Ross for helping out.

Gethin. 8th April 2013

Rhiwbach rockfall at top entrance

Update from Miles:
Just letting you know that there has been a fall at the top exit in Rhiwbach (the main exit, not the airshaft). The brow high above the gate has come away and there is a pile of fresh debris on the floor. You have to climb over the fall to get out.
There is still some loose stuff up on the brow, a few rocks are still waiting to come down.
No doubt a result of ice thawing.
Although it’s not massive, I would recommend closing that route until it settles down. If someone could abseil down to the brow from above, I bet a lot of the loose stuff could be knocked out.
Cheers
Miles