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Mine Exploration Forum

Author Penrhyn Quarry Flooding
grahami

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Joined: 29/01/2007
Location: Telford, Shropshire

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Penrhyn Quarry Flooding
Posted: 07/06/2017 17:33:18
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Hi All

Don't panic! This is a historical question.

I'm having a mental block or something - can anyone tell me when the "North," i.e. lower, Penrhyn Quarry was given up for working and the (electric) pumps stopped and removed ? I've found one reference which suggests that it was given up for production in 1989 - but that's all. I can't find anything on the web and none of my current reference material says anything. Also does anyone know how long it took to flood up to the drainage level after work was given up?

All help welcome!

Grahami

Photograph:



(click image to open full size image in new window)

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The map is the territory - especially in chain scale.
IP: 89.240.188.85 Edited: 07/06/2017 17:44:44 by grahami
sinker

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Joined: 13/12/2010
Location: North Wales.

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Penrhyn Quarry Flooding
Posted: 07/06/2017 18:24:10
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We did a load of shot hole deviation surveying there in 1989 and 1990 and that was around the time that it was worked out.
I remember it well as I dropped a Husky Hunter (remember them...??!)....


https://en.wikipedia.org/wiki/Husky_(computer)


from the edge of one bench and it bounced down another 2 or 3 benches and I thought "it'll be ok"....before going "plop" in the bottom of the pit and sinking out of sight....and the water was a loooong way down then. Bloody expensive day out that was! The equivalent today would be to throw around ten grand in cash over the edge Laugh

Anyway, I'm Off Topic but 1989/90 sounds about right

as "end of life"?

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Ah, well, now, you see.... IP: 86.158.212.40 Edited: 07/06/2017 18:33:17 by sinker
grahami

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Penrhyn Quarry Flooding
Posted: 07/06/2017 19:56:22
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My copy of a 1972 brochure (it's on here) says:
“Fourteen million gallons of water per day have to pumped out of the quarry during periods of heavy rainfall.”
But I can't even guess how long that would take to fill up the void!

Grahami

--

The map is the territory - especially in chain scale.
IP: 89.240.188.85
mistericeman

Joined: 04/10/2009
Location: Ashton-under-Lyne (Manchester)

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Penrhyn Quarry Flooding
Posted: 07/06/2017 20:07:46
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sinker wrote:

We did a load of shot hole deviation surveying there in 1989 and 1990 and that was around the time that it was worked out.
I remember it well as I dropped a Husky Hunter (remember them...??!)....


https://en.wikipedia.org/wiki/Husky_(computer)


from the edge of one bench and it bounced down another 2 or 3 benches and I thought "it'll be ok"....before going "plop" in the bottom of the pit and sinking out of sight....and the water was a loooong way down then. Bloody expensive day out that was! The equivalent today would be to throw around ten grand in cash over the edge Laugh

Anyway, I'm Off Topic but 1989/90 sounds about right

as "end of life"?


http://huskyhunter.shedlandrobotics.co.uk
IP: 82.31.98.113
Blober

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Joined: 16/12/2012
Location: Anglesey

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Penrhyn Quarry Flooding
Posted: 07/06/2017 20:17:23
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"The Husky was designed to be used in harsh conditions, such as wet and cold weather, by users such as the military. It is waterproof and can be dropped from a considerable height onto a hard surface without sustaining damage" Might be okay still? Laugh

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sinker

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Penrhyn Quarry Flooding
Posted: 07/06/2017 20:23:20
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Yeah I like to think that after 27 years down there it is still bleeping away, calculating azimuths Smile

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Ah, well, now, you see.... IP: 86.158.212.40
T666jay

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Joined: 09/01/2013
Location: Anglesey

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Penrhyn Quarry Flooding
Posted: 08/06/2017 14:52:02
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Maybe Jemima can help!

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sinker

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Penrhyn Quarry Flooding
Posted: 08/06/2017 18:52:40
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T666jay wrote:

Maybe Jemima can help!


Good thinking! We could lower her down off the zip line Laugh


note: Jemima is the Thursday Nighters ROV....not an actual person!!




(click image to open full size image in new window)



--

Ah, well, now, you see.... IP: 86.158.212.40
grahami

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Penrhyn Quarry Flooding
Posted: 09/06/2017 18:13:16
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Wyn's recent photo postings seem to confirm that work was still going on in the pit in the mid 1980s - good! _and thanks!

Grahami

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