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Post by rob52 on Feb 14, 2014 16:06:26 GMT -5
Noted the discussion under CMPB History =>> suggest Goaf Hangup Longwall or Miniwall & weighed face deserves it own thread We had problems at Moonee Catherine Hill Bay, NSW with 90m wide blocks & Goaf fall creating massive air blasts……some detail in "Risk Minimisation in Longwall Operations in Massive Goaf"Rob |
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Post by John on Feb 14, 2014 16:19:42 GMT -5
Noted the discussion under CMPB History =>> suggest Goaf Hangup Longwall or Miniwall & weighed face deserves it own thread We had problems at Moonee Catherine Hill Bay, NSW with Goaf fall creating massive air blasts……some detail in "Risk Minimisation in Longwall Operations in Massive Goaf"Rob
I had to laugh at your statement air blasts, when I was at Wongawilli, I was on the first face lifting pillars off via a modyfied Wongawilli method. It had been many years since they had worked that method and we only had one experienced miner in the team. I was on "Doggy", (nights) as face elec, lifting had started on day shift with the first lifts, and when we came on, the swing shift had started another lift, so we carried on after a Deputy's pet talk on safety. None of the goaf had collapsed, so there was a fair amount hanging and NOT banging, YET!!.
We completed the lift, Feds set the breakers and started another lift. Half way through, the goaf started "talking" and got loader the more coal cut.
Lift almost completed, the Deputy blew his whistle and all hands set to to get the miner to safety..
We waited and it settled down, so the Deputy had the Feds start setting breakers, then sent the miner back in for a couple more cuts, about all we got, whistle blew again, this time miner pulled way back up the road, I went back down with the Deputy and CM driver, no sooner had we got there than we were running for our lives!!
There was a large swilly full of black ugly water, CM driver and myself got by it OK, we got up to the belt road and whoosh, we couldn't see a thing. Goaf had fallen and raised tons of dust, then the Deputy emerged, dripping wet and blacker than an Abbo!! We couldn't stop laughing...Phone rang, appears all the mine air reversed for a few seconds and there was two districts of men thought we'd had an explosion. |
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Post by rob52 on Feb 14, 2014 16:37:00 GMT -5
At Wallarah we ended up with breaker line supports used in conjunction with a Joy Flexible Conveyor train to "improve production".....lifting pillars on retreat was the norm and could necessitate a change in underpants....or a life changing event, some FEDs lost there nerve if they had been involved in a life changing event as soon as the strata started talking....luck of the draw sometimes...rib spoil and floor heave making it a high risk activity.
Rob
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Post by John on Feb 14, 2014 16:58:24 GMT -5
Had a few "hairy" moments, but never lost my nerve, couldn't afford to really, panic would cause an accident...Set of lads in both teams I worked with, were cool as cucumbers.
The only time I got real nervous was when one of the shuttlecars started to get a noisy traction motor bearing half way through a lift, I'd got visions of having to change a motor out with the goaf working.......I'd have sent out the pit for a box of toilet rolls....
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Post by colly0410 on Mar 9, 2019 12:06:29 GMT -5
Only ever saw a small scale gob hang-up on 66's face in the Waterloo seam down Moorgreen, I nearly poo'd my pants when it dropped & flushed into the crawl track. I never saw any hang-ups down Hucknalls Deep Soft or Black Shale seams. Heard from older Hucknall blokes that the Main Bright seam was a bu**er for hang-ups & you could see back many yards behind the chocks into the gob till they dropped..
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Post by John on Mar 9, 2019 15:56:53 GMT -5
Used to happen often at Angus Place when a new longwall had just started retreating, in my time there I think LW8 was the worst, over 300 feet of goaf standing, the fear was if it came in one go, it could take out all the face shields. But it didn't, it started as a trickle then started dropping and then "whoosh" the rest dropped with no side effects other than a load of dust, then back to shearing coal. It never happened again after that first start of a new face.
The main gate end dropped one shift, caused a lot of damage to the Bridge Stage Loader and boot end of the belt, luckily nobody was under or near it.
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merlin
Shotfirer.
prop and lid
Posts: 64 
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Post by merlin on May 26, 2019 10:36:23 GMT -5
at bersham colliery north wales we had a seam called the ruabon yard the waste use to hang the following shift use to ask not where the shearer was but has the waste dropped they were on props and bars when the waste came it knocked the supports out
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Post by John on May 28, 2019 15:44:01 GMT -5
at bersham colliery north wales we had a seam called the ruabon yard the waste use to hang the following shift use to ask not where the shearer was but has the waste dropped they were on props and bars when the waste came it knocked the supports out
I remember the Deputy stopping the face during a production shift, examine the roof in the goaf and listen for it working. After a while he'd start the face cutting again.
We had one face that the Manager was given reports on hourly at home. He was planning to come in and use some "poppers" to help it drop if it didn't on the shift I was on. It eventually came before the end of that shift, and didn't drop as was expected, pretty gentle really for the amount hanging. That colliery had a massive sandstone roof.
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