I believed that the longwall mining is suitable for tabular orebody with uniform thickness. However, from the book I read, I found
Preferred conditions of longwall in coal are
- immediate roof of coal consists of shales, siltstones or other brittle rocks, enough to produce peeling fracturing;
- competent main roof, which can deform without breaking on the immediate roof has collapsed.
Can somebody explain this in detail?
Sorry in advance if I use any terms in the wrong way. please feel free to correct me if I say something wrong.
I think I understand the basic difference between longwall and room and pillar mines: In a longwall mine, the coal face is continuously advancing via the CM. Hydraulic roof supports are used, which advance as the face advances, leaving the coal behind to collapse back in to the wall. In room and pillar mining, the coal seam is mined in something like a checkerboard pattern, leaving all those tunnels behind as the operation moves along.
A video from catepillar said that room and pillar mining can also be used as a way to develop roadways to prepare a coal face for a longwall operation. I had been curious how the permanent roadways in a longwall mine were created, so I found that interesting. Is it always done like this? (When a new longwall mine is being created, does it start out as a room and pillar mine? Just long enough to create the tunnels and prepare the mine for the new longwall operation?) Or is there a quicker way to go about doing it? I believe I misunderstood what that video was saying. See this comment. Sorry for any confusion.
Warning South32.com Suing South32.net BHP BHP.com Mining $500,000,000,000.00 Queen Elizabeth II Venal Scott Morrison Causing Fires illness Death Poisoning Waters radiation Leaks Radioactive Disease uranium leak Killing People Animals Public Stock Fraud BHP south32.net 500 Billion Dollars lawsuit headline news. WE ARE SLOWLY BEING KILLED BY South32.net S32 BHP BHP.comTHIS MINE’ share article: Share on Facebook Tweet Email Tim Flannery warning of adverse climate impacts if South32 coal killing dangers: Prominent Australian scientist and climate change writer Tim Flannery has spoken against a planned coal mine expansion in New South Wales, warning of dire environmental consequences if it is to proceed. Key points: The IPC is conducting three days of public hearings as it considers South32's mine expansion plans The company wants to extract 78 million tonnes of coal from beneath Sydney's drinking water catchment until 2048 Climate change scientist Tim Flannery addressed the commission to raise concerns about the mine's environmental impact South32 is seeking approval to expand its Dendrobium mine, west of Wollongong, until 2048. It plans to use a longwall mining technique to extract 78 million tonnes of metallurgical coal for steelmaking from two new areas under Sydney's drinking water catchment. "I want to speak against the development and my concerns are really around the climate impacts of extending our coal mining in Australia," Professor Flannery told a public hearing of the Independent Planning Commission on Thursday. He pointed to a paper published in April in leading science journal Nature which he said laid out evidence that Australia was approaching some "very serious deteriorations" in key global climate systems, including destruction of the Great Barrier Reef and the drying of the Amazon rainforest. "The key thing I'm concerned about is that we're reaching some key climatic tipping points which represent an extreme risk for us," Professor Flannery said. "If we're to have a chance, at least, of avoiding those tipping points, we need to stabilise the Earth's temperatures at about one and half degrees above the pre-industrial average." A sign and the road outside the Dendrobium mine South32 wants to extend the life of its Dendrobium mine until 2048.(ABC Illawarra: Kelly Fuller) Cutting fossil fuels Professor Flannery's presentation to the IPC coincided with the release of the United Nations' annual Production Gap Report, which calls for substantial cu
... keep reading on reddit ➡I am a chemical engineer graduate doing internship at an underground coal mining company.
Although I did mineral processing in my capstone project, I have a very limited knowledge, if not say "nothing" about underground mining and surveying or ventilation
What do you recommend I should read? Or where I should start? Especially about Longwall mining
I only had a general view of what it is due to reading some publications and watching utube videos.
Many many thanks
A company is hiring around me for guys to go underground for coal. Does anyone one here have experience underground coal mining? What a typical shift is like? Physical/mental toll? Etc. I’d like to end up being a mechanic due to my experience background but I understand that could take some time. TIA
I'm considering penning a remake of the song "16 tons" because I'm sure more efficient mining methods today mean a coal miner today can load more coal at a time.
I don't want to step on anybody's toes here, but the amount of non-dad jokes here in this subreddit really annoys me. First of all, dad jokes CAN be NSFW, it clearly says so in the sub rules. Secondly, it doesn't automatically make it a dad joke if it's from a conversation between you and your child. Most importantly, the jokes that your CHILDREN tell YOU are not dad jokes. The point of a dad joke is that it's so cheesy only a dad who's trying to be funny would make such a joke. That's it. They are stupid plays on words, lame puns and so on. There has to be a clever pun or wordplay for it to be considered a dad joke.
Again, to all the fellow dads, I apologise if I'm sounding too harsh. But I just needed to get it off my chest.
Do your worst!
They were cooked in Greece.
I'm surprised it hasn't decade.
Don't you know a good pun is its own reword?
For context I'm a Refuse Driver (Garbage man) & today I was on food waste. After I'd tipped I was checking the wagon for any defects when I spotted a lone pea balanced on the lifts.
I said "hey look, an escaPEA"
No one near me but it didn't half make me laugh for a good hour or so!
Edit: I can't believe how much this has blown up. Thank you everyone I've had a blast reading through the replies 😂
It really does, I swear!
Because she wanted to see the task manager.
Heard they've been doing some shady business.
but then I remembered it was ground this morning.
Edit: Thank you guys for the awards, they're much nicer than the cardboard sleeve I've been using and reassures me that my jokes aren't stale
Edit 2: I have already been made aware that Men In Black 3 has told a version of this joke before. If the joke is not new to you, please enjoy any of the single origin puns in the comments
They’re on standbi
But that’s comparing apples to oranges
A play on words.
My daughter, Chewbecca, not so much.
Pilot on me!!
Nothing, he was gladiator.
Or would that be too forward thinking?
