Has Anyone any tips on emptying rubbish-filled mine shafts, please?· Page 2

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mcdermit
50.2% (Neutral)
Newbie

13 years ago

#21

Lovely to hear someone removing crap from a mine , theres enough of us explorers keen to muck in im sure if you lay on Tea /Biscuits you would have a few extra helpers ? :thumbsup:

Gavin
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13 years ago

#22

"mcdermit" wrote:
Lovely to hear someone removing crap from a mine , theres enough of us explorers keen to muck in im sure if you lay on Tea /Biscuits you would have a few extra helpers ? :thumbsup:

Now your talking ::) ::)

GAVIN

KernowRob
50.2% (Neutral)
Newbie

11 years ago

#23

Sorry to bring up an old thread, but I'm extremely curious as to how you got on with this little project. According to Hammy Jenks the Boteto Adit continues to Trevoole, and as I live at the other end of the Boteto adit I'm particularly interested to know the depth to water at Trevoole.

So, how did it go?

Drillbilly.
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11 years ago

#24

Adit is 13f according to dines.

KernowRob
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11 years ago

#25

"Drillbilly." wrote:
Adit is 13f according to dines.

That would make sense, adit shaft is approx 25ft deep on my land, and we are in the bottom of the valley, however 20ft is underwater due to adit collapse downflow of us. Trevoole is easily 50feet above the elevation of my adit shaft.

Drillbilly, sort of off topic but a quick question somewhat related, do you happen do know the rough gradient these old adits were driven at? We're a fair way from Trevoole as the crow flies but would be interesting to know the elevation change of adit level over the 2km or so between the 2 sites, and to work out the level of accessible workings along the length of the adit.

Also, any sources of information on the Boteto adit you have come across would be appreciated if you have any. I've only seen it referenced on Hamilton Jenkins maps, no other place which is frustrating!

Drillbilly.
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Newbie

11 years ago

#26

I have seen all sorts of different gradients and steps in adits. I gather water will flow at 1:100 but often they are much steeper than this. I'd work off 1:50 to put you in the right ballpark and anything steeper is a bonus.

The boteto adit is merely the adit at boteto. It runs as a crosscut for a bit, where it picks up North Lode, follows it a bit until it intersects main lode, which engine shaft itself is crosscut to (hits it at depth). The transverse section shows the lode underlying approx 45 degrees. The symons map of the area shows a N-S line which is marked adit further North. It is marked "large crosscourse" on the plan and no levels are shown on it, but it does seem to dislocate the lode structure by a nadge.

royfellows
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11 years ago

#27

If you want to know the gradient of an adit its dead easy if its wading. Just measure the water depth against a survey.

My avatar is a poor likeness.

Vanoord
54.4% (Neutral)
Newbie

11 years ago

#28

I'd thought of 1:100 as being about right for drainage, but I'd imagine you'd need a bit of skill to achieve that so I can see how something a bit steeper might be more commonplace.

I'd imagine that if you were driving adits for drainage, you'd try to keep the gradient as shallow as possible (while still encouraging the water to flow) so as to maximise the ability of the adit to drain the workings - the outflow point would usually be fixed, so the gentler the gradient, the lower the workings that the adit could drain.

Hello again darkness, my old friend...

hymac580c
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Newbie

11 years ago

#29

"royfellows" wrote:
If you want to know the gradient of an adit its dead easy if its wading. Just measure the water depth against a survey.

An easy way to measure a gradiant is to put a long spirit level on a camera tripod. Measure as far forward as you can from the tripod and mark the floor. Get someone to hold a tape measure vertical at that point while looking along the spirit level. When the tape is level with the top of the spirit level that is the difference in height. Then do your calculation.

Bellach dim ond swn y gwynt yn chwibian, lle bu gynt yr engan ar cynion yn tincian.

KernowRob
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Newbie

11 years ago

#30

Quote:

An easy way to measure a gradiant is to put a long spirit level on a camera tripod. Measure as far forward as you can from the tripod and mark the floor. Get someone to hold a tape measure vertical at that point while looking along the spirit level. When the tape is level with the top of the spirit level that is the difference in height. Then do your calculation.

Or borrow a dumpy level and a staff? haha :lol:

Just the rough value posted here should help me out, I couldn't find much info on it so I should be able to do a couple of calculations based on that. Thanks very much for all of your input. I'd love to hear if the adit is cleared at Trevoole though!

Ty Gwyn
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Newbie

11 years ago

#31

"Vanoord" wrote:
I'd thought of 1:100 as being about right for drainage, but I'd imagine you'd need a bit of skill to achieve that so I can see how something a bit steeper might be more commonplace.

I'd imagine that if you were driving adits for drainage, you'd try to keep the gradient as shallow as possible (while still encouraging the water to flow) so as to maximise the ability of the adit to drain the workings - the outflow point would usually be fixed, so the gentler the gradient, the lower the workings that the adit could drain.

Spot on,
Not only driving the level on a watercourse,one would need to move drams freely manually,the Horse can only do so much ,the man also has to move the dram on to the top of the heading.
The secret is to use the water under ones feet as the level,imagine a pair of 6yd rails,one end submerged below the surface ,the other end rising out of the water,enough fall for dram movement.

Alasdair Neill
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11 years ago

#32

really the best way to start off, if finances and access allows, is using a long reach excavator to dig down to bed rock & as far further as it willreach, then put in some concrete pipes & backfill round them. That's been done on quite a few cave digs on Mendip, apart from on professional shaft works.

lozz
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Newbie

11 years ago

#33

It would depend on the angle of the lifters (bottom blasting holes)

One foot in a hundred would be ok, the main crosscut on the 310 fm level (North) at South Crofty was quite steep.

Leats are different, to slow a flow can cause silting, to fast and the clay lining can get eroded.

Lozz.

Trevooley
50.2% (Neutral)
Newbie Topic Starter

11 years ago

#34

Just to let you know, this one is still ongoing! We have noticed that the rubbish left in the hole has moved a bit because of the vast amounts of rain!
We hope to continue in the near future, with emptying and shoring things up round the shaft. I will keep you updated on the progress! Sorry it's a little slow, but renovation of the cottage has taken over a bit, as there's been a lot to do.
We have taken out quite a few ex-electrical white goods, household rubbish and loads of SOCKS!!!!!!
We will be clearing around the area soon to continue. We have been using harnesses securely attatched by ropes to nearby trees, to retrieve the rubbish.
Please ask if there's anything else you might want to know; I'll try and reply when I can!
Kind regards, Suzanne. :confused:

KernowRob
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11 years ago

#35

Thanks for the update, Suzanne!

I believe Trevoole drains into the adit which breaks the surface under the viaduct in Penponds, and as I'm doing a similar thing to you (but on my end of the adit) I'm curious as to the depth you have managed to get to so far in the shaft you are trying to clear. Adit level shouldnt be backed up with water as it is here, due to the inclination of the adit and the elevation of Trevoole. It seems adit level should be "Wadable" from about 600m upflow of where I am in Penponds.

If you ever want a hand to clear out the shaft, I'd be more than willing to lend one. Best of luck with the project! :thumbsup:

Alasdair Neill
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Newbie

11 years ago

#36

Think there is no fixed rule for the gradient of an adit. SWCM tied to clear Redmoor adit ca 1980 & found considerable stretches were lower than the portal therefore flooded to the roof, driven each way from a number of adit shafts and stretches were just put in too deep, but once complete would function as long as the upstream end was higher than the portal & there were no connecting workings which required draining inbetween. Blanchdown adit in Devon Great Consols was in part driven towards the portal from main lode, & initially sloped the "wrong" way (they may have just used a pre-existing crosscut). They had to lower the floor resulting in a drive up to about 5m high.

Maggot
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Newbie

11 years ago

#37

Clear it from below?

Never take life seriously. Nobody gets out alive anyway.

KernowRob
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11 years ago

#38

"Maggot" wrote:
Clear it from below?

A fair idea to clear a shaft from underneath as long as you can guarantee no inrush, potentially very nasty I would imagine.

derrick man
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11 years ago

#39

"Maggot" wrote:
Clear it from below?

That is insane. I have to ask, what did they expect was up that raise and what was the outcome?

Maggot
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Newbie

11 years ago

#40

It's about 60 feet to surface, with a pillbox slotted concrete cap. Plumb lining from above tells us it's about half full of dumped crap. Clearing the waste is to improve ventilation. However, the project is currently on hold.

Never take life seriously. Nobody gets out alive anyway.