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Author Wheal Harriett or Dolcoath
agricola

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Joined: 28/10/2007
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Wheal Harriett or Dolcoath
Posted: 09/10/2012 19:36:30
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I've been thinking (dangerous), from the plans the houses next to the hole are built on the site of the compressor house, correct me if I'm wrong. These shallow tunnels might have been used to take the air to the shaft, or if they were not straight enough they weren't.

Like others, we are trying to piece together over 200 years of mining remains and trying to make sense of what we can only see part of. If we're lucky they might clear the area to have a better look or if were not its all going to be burried in C30. Either way interesting don't you all think !

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If it can't be grown it has to be mined.
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Knocker

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Wheal Harriett or Dolcoath
Posted: 09/10/2012 19:58:38
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It certainly is interesting.

Allan Buckley indicates in his book a network of shallow tunnels around Dunkin's Garden that had been positively id'd, as such I would imagine it is highly unlikely it is one of those tunnels.

As you say it may have been used by the compressor house, were there any remediation works done at the site prior to the building of the houses? I assume they were developed by Carnon at the time? As we all know, the biggest weakness of mining surveys is that they only find what they are looking for!

Heading in the other direction, does the tunnel extend under the road - the main lower pengegon road is considerably lower, as such it has the potential to be even nearer surface, or perhaps there was an adit portal near the road feeding into the leat system?

I find it hard to believe that this is just a tunnel, adit or level. Why is the Dracaena tree now 20 foot down? If it were just a tunnel we would surely be looking at a depression on surface not a bleddy geat hole! Yes I know the spoil could have been washed away and down the shaft, but I think its unlikely that would occur that quickly.

Personally I am surprised that the council are dragging their heels on this one as this has the potential to get much worst, I would have thought they would have been in first thing yesterday to start excavating to check the level of risk to both the road network and the nearby dwellings - if the end house was to disappear tonight, where would the liability lay?
IP: 90.221.39.42
Dolcoathguy

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Joined: 21/05/2008
Location: Camborne, Cornwall

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Wheal Harriett or Dolcoath
Posted: 09/10/2012 20:17:56
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Having a more in depth read of AB's book on page 11:
(Section on 18th cent mining)

At Dunkins Garden Shaft, at the eastern end of Dolcoath avenue, the lode was worked to the west of the shaft from the surface. These coffins are probably typical of the way mines were first opened for tin.



This sort of ties in with the direction and Stuey's observations.
But I dont know what they used to do with these close to surface worked lodes - perhaps they were loosely filled and left? Any ideas?

As Knocker says - all very interesting...

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Is it safe to come out of the bunker yet?
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Knocker

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Wheal Harriett or Dolcoath
Posted: 09/10/2012 20:31:51
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On that I would say its more likely they were boarded over, or perhaps there was a level supported on timbers.

If it was just loose backfill, I'm certain there would have been gradual sinking over the years not total collapse.

What Lode was this and to what depth was it worked?
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stuey

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Wheal Harriett or Dolcoath
Posted: 10/10/2012 09:47:47
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I'm pretty certain that it is the top of stoping.

My hunch is that the footway is sunk just inside the hanging wall, perhaps to clear the fractured ground and the holes are on the outcrop. The rock visible in the right hole looks worn to me. It also seems to be slightly more rectagular than the other "slot". The timbers I could see are in line with one side of this.

Anyway, it is going to require some immense work.

I'm not going to be monitoring it every night as really, it's unlikely to open up clear to a depth (just a hunch) and although a huge great big scrape back and stope cap might happen, they will probably finish all the work before anything accessible happens. I wonder if the shallow levels are driven on-lode and are likely to be partially collapsed and not of any interest. Ideally, it would be possible to get to the open footway via the hole and then drop that to adit. Now that would be interesting! It will never happen though.
IP: 92.29.168.242 Edited: 10/10/2012 09:53:16 by stuey
Dolcoathguy

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Wheal Harriett or Dolcoath
Posted: 10/10/2012 09:51:24
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Not sure about the depth, nearest lode I have been able to find is the Caunter lode.
Also is a link giving info about Wheel pits around this area of dolcoath.

But is worth a look on the Heritage gateway sites / County council sites:

http://mapping.cornwall.gov.uk/website/A2M/viewer.asp

http://www.heritagegateway.org.uk/Gateway/Results_Single.aspx?uid=MCO55014&resourceID=1020

http://www.heritagegateway.org.uk/Gateway/Results_Single.aspx?uid=MCO55015&resourceID=1020

Also in AB's book on p148? (from memory) is a picture of the compressor house with Dunkin's in the background, but you'll need to get a hi res scanned image from somewhere to see anything useful!

--

Is it safe to come out of the bunker yet?
IP: 194.126.226.123 Edited: 10/10/2012 10:00:20 by Dolcoathguy
derrickman

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Wheal Harriett or Dolcoath
Posted: 10/10/2012 15:43:49
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regarding remediation by housebuilders, experience at Coombe Down was that practice was typically to collapse any workings within the footprint of the house only, or visible on surface once the topsoil was off, backfill and compact the area and build the footings. There was a quite upmarket estate at one end of the main area which had been remediated in this manner... I don't know if this would be Cornish practice for housebuilding over shallow unmapped workings, but I would hardly be surprised.

--

''the stopes soared beyond the range of our caplamps' - David Bick...... How times change .... oh, I don't know, I've still got a lamp like that.
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royfellows

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Wheal Harriett or Dolcoath
Posted: 10/10/2012 18:04:15
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Thinking about it, living in west Midlands isn't that bad.

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Whatever you find difficult do more not less, then it become easy.
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Trewillan

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Wheal Harriett or Dolcoath
Posted: 10/10/2012 19:05:08
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royfellows wrote:

Thinking about it, living in west Midlands isn't that bad.


Are you sure?

http://www.marstonspubcompany.co.uk/img/pubImages/3934_lrg.jpg
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derrickman

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Wheal Harriett or Dolcoath
Posted: 11/10/2012 02:26:52
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royfellows wrote:

Thinking about it, living in west Midlands isn't that bad.


I wouldn't go that far.... I remember working on a drilling rig once, that was engaged in drilling and grouting old mine workings in the Mansfield area, whole blocks of 19th century workers' tenements showing severe settlement and just abandoned as commercially unviable.

--

''the stopes soared beyond the range of our caplamps' - David Bick...... How times change .... oh, I don't know, I've still got a lamp like that.
IP: 213.172.74.154
Roy Morton

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Joined: 09/10/2007
Location: Redruth Cornwall

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Wheal Harriett or Dolcoath
Posted: 11/10/2012 02:32:02
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I think I'd rather live in St.Day Laugh

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exspelio

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Wheal Harriett or Dolcoath
Posted: 11/10/2012 18:21:58
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Mansfield is East Midlands.

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Always remember, nature is in charge, get it wrong and it is you who suffers!.
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KH....

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Wheal Harriett or Dolcoath
Posted: 11/10/2012 22:50:52
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I have been to the hole in question today, nothing visible has changed.

I think it was Agricola lamenting about a lack of rocks to throw down the holes, however the locals are a resourceful lot and have solved the issue by partly dismantling the nearby stone wall, rocks aplenty.
All the police warning tape has also be torn away.

I wonder if it will expand or is it the limit of the collapse?
IP: 95.147.58.82 Edited: 11/10/2012 23:20:51 by KH....
Knocker

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Wheal Harriett or Dolcoath
Posted: 11/10/2012 22:54:11
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You need to look closer Kim, the granite seat is edging ever nearer to the hole! (Actually it might not be the seat moving!) IP: 90.221.39.42
KH....

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Wheal Harriett or Dolcoath
Posted: 11/10/2012 23:29:58
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I was wondering about that seat, how many people must have been sitting on it recently or using the path when just the weight of walking over it was the final straw for the collapse! IP: 95.147.58.82
Knocker

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Wheal Harriett or Dolcoath
Posted: 12/10/2012 07:31:42
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I'm glad I didn't go down town last Friday night, I normally walk right across there on my way home!!! IP: 90.221.39.42
agricola

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Wheal Harriett or Dolcoath
Posted: 12/10/2012 09:07:59
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KH.... wrote:

I have been to the hole in question today, nothing visible has changed.

I think it was Agricola lamenting about a lack of rocks to throw down the holes, however the locals are a resourceful lot and have solved the issue by partly dismantling the nearby stone wall, rocks aplenty.
All the police warning tape has also be torn away.

I wonder if it will expand or is it the limit of the collapse?


There was a good reason why I didn't pick rocks from the partly dismantled stone wall, my boss was standing next to me and there were at least two high ranking members of Cornwall Council / Comac there as well. I would under normal circumstances have taken a couple of the better specimens, but the bottle did just as well.

I do wonder after the rain we had last night will make anything else move !

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If it can't be grown it has to be mined.
IP: 81.137.244.112
stuey

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Wheal Harriett or Dolcoath
Posted: 12/10/2012 10:17:10
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I might pop over and see how things are progressing. It sounds like it's very much on the move still. IP: 92.29.168.242
KH....

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Wheal Harriett or Dolcoath
Posted: 12/10/2012 21:59:52
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agricola wrote:

KH.... wrote:

I have been to the hole in question today, nothing visible has changed.

I think it was Agricola lamenting about a lack of rocks to throw down the holes, however the locals are a resourceful lot and have solved the issue by partly dismantling the nearby stone wall, rocks aplenty.
All the police warning tape has also be torn away.

I wonder if it will expand or is it the limit of the collapse?


There was a good reason why I didn't pick rocks from the partly dismantled stone wall, my boss was standing next to me and there were at least two high ranking members of Cornwall Council / Comac there as well. I would under normal circumstances have taken a couple of the better specimens, but the bottle did just as well.

I do wonder after the rain we had last night will make anything else move !


I see your point Agricola, with your boss next to you, breaking up the wall would be unwise!
The urge to throw a rock down a hole seems to be universal, and then listen for the results...
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Knocker

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Wheal Harriett or Dolcoath
Posted: 12/10/2012 22:29:21
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I think I would have just chucked my boss down to investigate!
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