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27-09-2018, 01:37   #1
Victor
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Magheracloone Mine Collapse

Story and photo here: https://www.irishtimes.com/news/envi...port-1.3642707 The location is here: https://www.openstreetmap.org/way/50...3.9443/-6.7695 The school is about 1km north.

It's interesting the way that the sinkhole (bottom of photo) is at the edge of the zone of impact. Another photo shows a second sinkhole. Given that it is water soluble, I'm surprised that the gypsum was being mined, as well as quarried (there is a large quarry across the road form the site).

More photos: https://www.rte.ie/news/ireland/2018...mine-collapse/

https://www.google.ie/search?q=Maghe...w=1024&bih=657

Last edited by Victor; 27-09-2018 at 01:47.
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27-09-2018, 02:32   #2
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Magheracloone GAA Club and Community Centre in Carrickmacross, where the sinkhole has appeared. Complex of factors. Makes you want to take core samples where you live?
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04-10-2018, 23:17   #3
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Its owner Gyproc Ireland says the recent transport and storage of water in an old part of the mine caused some underground pillars to collapse.
https://www.irishexaminer.com/breaki...ub-871801.html whats meant by this?
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07-10-2018, 09:52   #4
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Originally Posted by expectationlost View Post
The 'underground pillars' are columns of bedrock that are left in place to support the roof of the mine (if that is your question). The mine is worked around them. Sometimes they need to be reinforced with 'cribbing' - usually timber.
Sometimes the pillars are mined out in a controlled manner to access the minerals above.
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07-10-2018, 12:56   #5
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Originally Posted by slowburner View Post
The 'underground pillars' are columns of bedrock that are left in place to support the roof of the mine (if that is your question). The mine is worked around them. Sometimes they need to be reinforced with 'cribbing' - usually timber.
Sometimes the pillars are mined out in a controlled manner to access the minerals above.
more asking about the water storage...
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20-12-2018, 21:22   #6
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Another collapse: https://www.rte.ie/news/ulster/2018/...hole-monaghan/

Re:water - it may be that they use disused mine caverns to hold water pumped from active caverns.
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12-01-2019, 18:20   #7
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better description of what occurred in the irish times behind the paywall https://www.irishtimes.com/news/envi...rish-1.3754925
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The lack of rain earlier last year saw the river Bursk shrink in volume, and in June, when the gypsum miners had to deal with a temporary excess of sulphate-laden water in one part of the mine (which they would normally do by pumping it into the river – safely and under Environmental Protection Agency licence), they channelled it instead into abandoned mine shafts, some 60m-70m underground.

They had done this before without adverse consequences, though not on this scale. Excess mine water is normally discharged into the river at a rate that does not cause environmental damage, but this can only be done when there is a sufficient volume of river water – an option not available last summer.

Within three months of the mine water being stored in the disused mine, several of the slender, 12m-high underground pillars holding up the disused tunnels collapsed, the mud foundations in which they sat weakened by the liquid.

Last edited by expectationlost; 13-01-2019 at 12:59.
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15-01-2019, 10:58   #8
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Independent Review of Investigation into Collapse of Workings at Drumgoosat, Co. Monaghan https://www.dccae.gov.ie/en-ie/natur...s/default.aspx they were on RTE SOR today, promising to pay for whats needed, but also saying well they only way we can sort this out is to open cast mine the area.
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