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Author Curious about an adit
Jack Tempest

Joined: 04/07/2017

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Curious about an adit
Posted: 04/07/2017 21:32:59
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royfellows wrote:

I have looked at your photo and it is certainly not an ice house much too small, some drainage levels certainly are that small.

Than you for giving this your attention. It's far more interesting than I expected. Happy to DM anyone who has local knowledge/ maps. Does this sort of stuff get collected and built into a picture by local historians or mining enthusiasts? How far away from the shaft/mine, typically, is an adit of this size? Or is it possible that an adit was created before any mine workings were commenced? Apologies for the ignorance!
IP: 86.181.103.149
Morlock

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Curious about an adit
Posted: 04/07/2017 21:52:46
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Not the full picture, but a good start.

https://en.wikipedia.org/wiki/Adit
IP: 86.183.150.3
The Fresh Prince of Portreath

Joined: 05/08/2015

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Curious about an adit
Posted: 04/07/2017 21:54:51
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We did work in the area and Wheal Lemon is the site (I suspect).

Mining History.

Mylor and Angarrick are not noted mining areas and Wheal Lemon is an anomaly. The noted cartographer and mining commentator (R Thomas) records Wheal Lemon on "A Map of Restronguet and the Barton of Carclew" dated 1808. A line of shafts outlines the lode which is recorded as producing tin ore (Cassiterite, SnO2) and another line of seven shafts outlines the course of the drainage adit. In September 1808 the mine was recorded by The Royal Cornwall Gazette as having a steam engine (pumping) equipped with a 20" cylinder and two horse whims (devices for hoisting ore), after an expenditure of several thousand pounds, operations were abandoned some fourteen months later, when the materials were advertised for sale.

Wheal Lemon is very poorly recorded and the Thomas Map is the only known record of the workings. It is possible to locate some of the shafts with a degree of accuracy and infer the position of the mineralised lode by noting the directions of the mining features (drainage tunnel and workings) by the position of the shafts. There is no record of the lode, or the workings upon it, or the depths. It is not thought to be a significant mine. There is no information as to the width of the lode, or the dip (how it inclines at depth). Due to this lack of information, we have to assign an "inferred outcrop" and make this as wide as could cater for the most likely scenarios. It is likely that this working was discovered by the appearance of ore in the fields, or by surface excavations (bases for hedges, drains, etc). It is likely that the lodes were worked at surface and various pitting and excavations are present.

The map is a very interesting thing and shows "Steam Engine" as well as a whole load of different shafts leading to an adit in the valley. (It could be this one). The problem is that with a long adit (which this appears to be), there are lots of small adit shafts, which make useful bins.

I'd be up for having a wade in there. It has the potential to be quite unusual, due to it's unique placement in an otherwise non-mining area.

The search probably didn't bring anything up, because there are no "plans" of Wheal Lemon, apart from this odd estate map, which most people would not have bothered to chase down and reference to modern mapping.

Edit:- I am most certainly here without my work hat on.
IP: 196.52.10.24 Edited: 04/07/2017 21:57:40 by The Fresh Prince of Portreath
Morlock

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Curious about an adit
Posted: 04/07/2017 22:08:32
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A little more info, should it be Wheal lemon.

https://www.mindat.org/loc-260512.html
IP: 86.183.150.3 Edited: 04/07/2017 22:21:26 by Morlock
robnorthwales

Joined: 21/05/2008
Location: Denbighshire, North wales

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Curious about an adit
Posted: 05/07/2017 00:00:31
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Here's a drainage level - Halkyn Deep Level.

https://www.aditnow.co.uk/Photo/Adit-For-Drainage-Tunnel-Above-Halkyn_62924/

The entrance is currently about 5 feet in height, though there is a pipe (visible) virtually buried in the thick sludge, and it was probably more like 8 feet originally. The passageway is close to 3 feet deep in thick, clingy gloop - and eels ! The tunnel is collapsed 2-300 yards in. It still carries a reasonable amount of water, however.
IP: 81.174.185.197
Jack Tempest

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Curious about an adit
Posted: 05/07/2017 07:35:17
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robnorthwales wrote:

Here's a drainage level - Halkyn Deep Level.

https://www.aditnow.co.uk/Photo/Adit-For-Drainage-Tunnel-Above-Halkyn_62924/

The entrance is currently about 5 feet in height, though there is a pipe (visible) virtually buried in the thick sludge, and it was probably more like 8 feet originally. The passageway is close to 3 feet deep in thick, clingy gloop - and eels ! The tunnel is collapsed 2-300 yards in. It still carries a reasonable amount of water, however.


So very similar in construction. Interesting. Thank you for that.
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The Fresh Prince of Portreath

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Curious about an adit
Posted: 05/07/2017 08:54:16
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For those of you who are interested. It doesn't look associated with the Wheal Lemon workings, nor is it present on "that map"
IP: 196.52.10.12
Peter Burgess

Joined: 01/07/2008
Location: Merstham. Or is it Godstone ...... ?

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Curious about an adit
Posted: 05/07/2017 09:12:54
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Is the discharge point at estuary level? That would be the best level for maximum effect for a mine working. If it's significantly higher than "sea level", then perhaps it was a level driven to feed a reservoir/cistern/whatever for a water supply of some sort, which would need to be below the portal. Water supply might be for a wheel, domestic/farm supply, industry of some sort........ IP: 86.187.77.198
lozz

Joined: 03/08/2012
Location: Cornwall

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Curious about an adit
Posted: 05/07/2017 10:46:59
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A map location or a description of the location might help.....?

Lozz.
IP: 86.141.80.60
Morlock

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Curious about an adit
Posted: 05/07/2017 10:53:26
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Peter Burgess wrote:

Water supply might be for a wheel, domestic/farm supply, industry of some sort........


I did find a pond and water wheel yesterday on 'old maps', but discounted it as not "facing Devoran".

https://zoom.earth/#50.202935,-5.101755,19z,sat

https://catalogue.millsarchive.org/carclew-estate-pump-wwheel-by-visick-1923-3-97
IP: 86.183.150.3 Edited: 05/07/2017 11:00:10 by Morlock
lozz

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Curious about an adit
Posted: 05/07/2017 11:03:24
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Morlock wrote:

Peter Burgess wrote:

Water supply might be for a wheel, domestic/farm supply, industry of some sort........


I did find a pond and water wheel yesterday on 'old maps', but discounted it as not facing Devoran.

https://zoom.earth/#50.202935,-5.101755,19z,sat

https://catalogue.millsarchive.org/carclew-estate-pump-wwheel-by-visick-1923-3-97


I don't think it's that, I freed up the wheel and did some repairs to the buckets on that water wheel on the Carclew Estate many moons ago, the discharge from the wheel is open all the way so far as I remember, no tunnel.

Lozz.
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Morlock

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Curious about an adit
Posted: 05/07/2017 11:07:01
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Tend to agree, mentioned just in case. IP: 86.183.150.3
Peter Burgess

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Location: Merstham. Or is it Godstone ...... ?

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Curious about an adit
Posted: 05/07/2017 11:07:56
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I was suggesting a head supply for a water reservoir not a tail race. As said, not knowing the circumstances means we are only speculating. IP: 86.187.77.198 Edited: 05/07/2017 11:08:32 by Peter Burgess
Morlock

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Curious about an adit
Posted: 05/07/2017 11:12:49
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Peter Burgess wrote:

I was suggesting a head supply for a water reservoir not a tail race. As said, not knowing the circumstances means we are only speculating.


If you refer to my earlier speculative map there is a gap between the pond and the start of the stream which may suggest a tunnel?

Edit: The gap between pond and stream is around 70 feet.
IP: 86.183.150.3 Edited: 05/07/2017 11:15:42 by Morlock
Peter Burgess

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Curious about an adit
Posted: 05/07/2017 11:17:18
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Yes, but do you know where the mouth of the tunnel is? IP: 86.187.77.198
Morlock

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Curious about an adit
Posted: 05/07/2017 11:23:31
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Top LH corner shows an aqueduct?

http://maps.nls.uk/view/105995737

Further speculate there could also be a tunnel for draining the pond?
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Morlock

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Curious about an adit
Posted: 05/07/2017 11:26:14
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Peter Burgess wrote:

Yes, but do you know where the mouth of the tunnel is?


No, but presumably near blue circled area as indicated by the OP.
IP: 86.183.150.3 Edited: 05/07/2017 11:28:19 by Morlock
lozz

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Curious about an adit
Posted: 05/07/2017 11:33:57
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Just to be clear on the Carclew pond (reservoir) and its water wheel, the reservoir's Northern bank on the OS map is a dam, between it's edge and the start of the discharge/overflow stream is the waterwheel and it's relevant workings, In the photo in Morlock's link the dam is just off picture to the right, the feed pipe (race) at the top of the waterwheel pokes into and through the dam to the right, the waterwheel drove a water pump, so far as I can remember the pump supplied water to the estate back in the day. Off and on I spent a couple of months doing some work on it moons ago, late 1970's early 1980's...ish.

Lozz.
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lozz

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Curious about an adit
Posted: 05/07/2017 11:53:16
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Morlock wrote:

Top LH corner shows an aqueduct?

http://maps.nls.uk/view/105995737

Further speculate there could also be a tunnel for draining the pond?


The aqueduct will be the feed race, it was a pipe when I was working on it but there might have been a timber or masonry based one there originally but that's just speculation on my part.

The Carclew pond is nearer Perranaworthal than Mylor.

Is the "adit" near Carsawsan?

Lozz.
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Morlock

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Curious about an adit
Posted: 05/07/2017 12:16:30
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lozz wrote:

Is the "adit" near Carsawsan?

Lozz.


Could be, all depends on what the OP considers close.

"Close but not in the circle. Good speculation."
IP: 86.183.150.3
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