Author Topic: Warning - Devonshire Mine entrance subsidance  (Read 4730 times)

Offline LarryFatcat

  • obsessive maniac
  • ***
  • Posts: 336
Re: Warning - Devonshire Mine entrance subsidance
« Reply #25 on: November 01, 2019, 11:28:38 pm »
One of the locals will have replaced it then. Code available via the DCA website.
https://peakdistrictcaving.info/home/the-caves/derwent-south/devonshire-cavern
yep the combo worked, I had forgotten to get it but phone reception near the entrance gave me internet access to the DCA registry and the 4 digit code

Offline SqueezyPete

  • Newbie
  • *
  • Posts: 12
  • Notts Uni Caving Club
Re: Warning - Devonshire Mine entrance subsidance
« Reply #26 on: December 08, 2019, 06:36:53 pm »
 What's the state of the lower entrance at the moment?

Offline Pete K

  • Pete Knight
  • forum hero
  • *****
  • Posts: 1625
  • DCA, PICA, TSG, DCRO, PDMHS, DCMC, YSS
    • Peak Instruction
Re: Warning - Devonshire Mine entrance subsidance
« Reply #27 on: December 08, 2019, 06:49:16 pm »
Unrepaired, so same as reported. Upper entrance fine.

Anyone fancy taking this job on? Some concreting and a bit of pointing up is all that is required.

Offline SqueezyPete

  • Newbie
  • *
  • Posts: 12
  • Notts Uni Caving Club
Re: Warning - Devonshire Mine entrance subsidance
« Reply #28 on: December 08, 2019, 10:56:22 pm »
 I'd like to help but I don't have much to offer, I like the cave because we can get to it easily without a car. I'd offer a helping hand after christmas if anything happens!

 Aside from the entrance subsidence the lower series should be grand to look around right? Assuming we take care with the bits near the infill.

Offline Pete K

  • Pete Knight
  • forum hero
  • *****
  • Posts: 1625
  • DCA, PICA, TSG, DCRO, PDMHS, DCMC, YSS
    • Peak Instruction
Re: Warning - Devonshire Mine entrance subsidance
« Reply #29 on: December 08, 2019, 11:13:24 pm »
From reports it seems there has been no movement in the mine itself, what we are looking at here seems only to be the collapse of the packwall built under the lower door frame, nothing more serious.

Offline AR

  • Black shadow
  • forum hero
  • *****
  • Posts: 1303
  • PDMHS, ATAC, ANHMS
Re: Warning - Devonshire Mine entrance subsidance
« Reply #30 on: December 09, 2019, 08:49:06 pm »
Pete, I'm going to try and take a proper look over the Christmas break.
Dirty old mines need love too....

Offline Pete K

  • Pete Knight
  • forum hero
  • *****
  • Posts: 1625
  • DCA, PICA, TSG, DCRO, PDMHS, DCMC, YSS
    • Peak Instruction
Re: Warning - Devonshire Mine entrance subsidance
« Reply #31 on: December 09, 2019, 08:54:29 pm »
Ace, meet too once I get quieter with work. Guess the ankle is better now then?
It's probably a bit cold for concreting now, but I don't think it is a big job once the people and weather are in place to do it.

Offline owd git

  • forum hero
  • *****
  • Posts: 1426
Re: Warning - Devonshire Mine entrance subsidance
« Reply #32 on: December 10, 2019, 08:20:23 am »
Sorry! got reet busy Pete, has slacked off a little, phone or message if you set a time. Ric, 07790 694292  :thumbsup:
Hen racer? 2000 world hen racing champion

Offline AR

  • Black shadow
  • forum hero
  • *****
  • Posts: 1303
  • PDMHS, ATAC, ANHMS
Re: Warning - Devonshire Mine entrance subsidance
« Reply #33 on: December 10, 2019, 08:51:39 am »
The ankle's about 90% of the way back to being fully operational, just need to keep doing my physio exercises to stretch and flex it.

I'll let people know when I'm thinking of heading up there, I'm thinking it might be possible to dig out underneath and rebuild with drystone packwall for the time being, and then go back and mortar it up later in the spring?
Dirty old mines need love too....

Offline owd git

  • forum hero
  • *****
  • Posts: 1426
Re: Warning - Devonshire Mine entrance subsidance
« Reply #34 on: December 10, 2019, 11:13:06 am »
From my building experience, the temp' will be fine for mortar or concrete. it's sheltered enough to not be a problem ,short of a really cold snap.  :thumbsup: If it does drop I will fetch mortar anti-freeze.
Hen racer? 2000 world hen racing champion

Offline Pete K

  • Pete Knight
  • forum hero
  • *****
  • Posts: 1625
  • DCA, PICA, TSG, DCRO, PDMHS, DCMC, YSS
    • Peak Instruction
Re: Warning - Devonshire Mine entrance subsidance
« Reply #35 on: December 10, 2019, 07:45:12 pm »
Ah great, that's handy to know.
I'm probably not going to personally get a chance to deal with this until at least mid Jan. I might be able to get over for a look before, but certainly not to organise the job. I'll let AR go take a look and once we are certain of the fix that needs doing, we can see about trying to find someone to coordinate the work. If you up for that OG, and want to pick a date that works for you, DCA will naturally cover all costs and I can find as many local helpers as you need. No probs if you're too busy, it can keep for a while as there is another way in after all.
Pete

Offline owd git

  • forum hero
  • *****
  • Posts: 1426
Re: Warning - Devonshire Mine entrance subsidance
« Reply #36 on: December 10, 2019, 08:03:39 pm »
Two man job  easy. have a willing idiot in mind. :lol :Cheers Pete & Adam.
Hen racer? 2000 world hen racing champion

Offline AR

  • Black shadow
  • forum hero
  • *****
  • Posts: 1303
  • PDMHS, ATAC, ANHMS
Re: Warning - Devonshire Mine entrance subsidance
« Reply #37 on: December 28, 2019, 09:33:37 pm »
Update - December 28

Having a couple of hours free this afternoon, I've been to take a look and start the repair work. On arriving at the door, I found there was a very large gap underneath it that could easily be squeezed through (see pic 1), the hazard tape was broken, and the door wasn't bolted  - to whoever has been going in this way, all I'll say is which bit of "do not use this entrance" don't you understand, and would you like it explaining in words of one syllable whilst being hit round the head with a shovel?

First job needed was to clear all the old soil and leaf mold from around the door; this is a job that really needs doing every couple of years to keep a free swing. Ten minutes with the folding shovel had this sorted, though I upset a lot of worms in the process.  Next, I had a good look at the inside; the large boulder and its surrounding rocks didn't look to have moved, it was the choss on top of it that had gone downslope and caused the hole.

There was plenty of rock in the entrance chamber so I set to work creating a packwall to fill up the gap and spent the next hour walling. As can be seen from photo 2, I've got  the gap mostly filled up but not completely, so more work is needed and mortaring up to really secure everything. In the meantime, please continue to only use the upper entrance. I also think there's some work needed on the big stones below to make certain they don't move. Photo 3 shows just how big the hole under the door had got!
Dirty old mines need love too....

Offline AR

  • Black shadow
  • forum hero
  • *****
  • Posts: 1303
  • PDMHS, ATAC, ANHMS
Re: Warning - Devonshire Mine entrance subsidance
« Reply #38 on: January 14, 2020, 10:57:13 pm »
Update 14/1/20 - Another session tonight, this time with help from Richard Finnigan, Mart Long, Shirley Burtonshaw and Arthur Wilson. Richard and Mart dealt with the bit under the frame, I rebuilt the bits behind the ladder, while Shirley and Arthur fetched stone for us.

The packwall is now much more solid, Richard rebuilt some of the bits I'd done in a hurry on the last session with more care and attention. Mortaring still to do though....
Dirty old mines need love too....

Offline royfellows

  • forum hero
  • *****
  • Posts: 1281
    • mineexplorer.com
Re: Warning - Devonshire Mine entrance subsidance
« Reply #39 on: January 15, 2020, 08:56:01 am »
I cant help wondering whether concrete would form a better solution?
Relatively easy to get materials close to the mine, plenty water inside not far in.

Mortaring the packwall built would possibly make something more permanent?
My avatar is a poor likeness.

Offline AR

  • Black shadow
  • forum hero
  • *****
  • Posts: 1303
  • PDMHS, ATAC, ANHMS
Re: Warning - Devonshire Mine entrance subsidance
« Reply #40 on: January 15, 2020, 10:06:58 am »
The packwall needs to be semi-permeable to cope with drainage from outside coming into the old shaft, so I think what's needed is just mortaring gaps up enough to stop the packwall moving but not so much to stop water getting through. I do need to go back when the weather's drier and repaint the door....
Dirty old mines need love too....

 

Main Menu

Forum Home Help Search