Penrhyn Quarry Flooding · AditNow Community

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grahami
50.2% (Neutral)
Newbie Topic Starter

8 years ago

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:

🔗6910[linkphoto]6910[/linkphoto][/link]

The map is the territory - especially in chain scale.

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sinker
50.2% (Neutral)
Newbie

8 years ago

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 :lol:

Anyway, I'm :offtopic: but 1989/90 sounds about right

as "end of life"?

Yma O Hyd....

grahami
50.2% (Neutral)
Newbie Topic Starter

8 years ago

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.

mistericeman
50.2% (Neutral)
Newbie

8 years ago

"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 :lol:

Anyway, I'm :offtopic: but 1989/90 sounds about right

as "end of life"?

http://huskyhunter.shedlandrobotics.co.uk

Blober
50.2% (Neutral)
Newbie

8 years ago

"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? :lol:

FILTH - Think this is a playground? Think again...

sinker
50.2% (Neutral)
Newbie

8 years ago

Yeah I like to think that after 27 years down there it is still bleeping away, calculating azimuths 🙂

Yma O Hyd....

T666jay
50.2% (Neutral)
Newbie

8 years ago

Maybe Jemima can help!

Tea and Scones

sinker
50.2% (Neutral)
Newbie

8 years ago

"T666jay" wrote:
Maybe Jemima can help!

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

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

🔗97788[linkphoto]97788[/linkphoto][/link]

Yma O Hyd....

grahami
50.2% (Neutral)
Newbie Topic Starter

8 years ago

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

The map is the territory - especially in chain scale.