Submitted by EasterBunnyArt t3_yifno5 in explainlikeimfive
This just popped into my head, but throughout history humanity has mined to some lesser or greater extend. But given that lightbulbs were a recent invention, how did we manage to mine throughout history. I understand the idea of the “canary in coal mine” but does it mean we basically hoped on luck or had venting periods? I can’t imaging an old mining tunnel with torches being anything but a nightmare.
Old mining tunnels were certainly a nightmare. But they did know how to ventilate them. They would sometimes dig a vertical shaft connected to a tunnel and set a fire in it. The fire would draw air in, and send smoke up. They could configure it so that it drew air from the working face, and sent it up and out.
Mines didn't have torches, they had small lamps. It was dark and hellish. Miners had short lives.
Believe it or not they ventilated mines with fires. It likely started as a way to view what they were mining, but they noticed that the fires created an air current within their mine that drew fresh air in and the hot noxious air was pushed out. Later civilizations also had this same realization. The Greeks had ventilation shafts powered by fire heat. Romans, being engineers, figured out how to use manpower (ie slaves) and plam fronds to waft air along the ventilation shafts. Still mining was a dangerous business and many miners died from various gas poisonings.
For much of history we used simple wax candles for light in the mine. They were dim, but in pitch darkness they were more than adequate. Luckily candles really don't consume that much oxygen, much less than a human would. So there really wasn't any indications that candles were a risk.
Interesting thank you for enlightening me. 😀
Interesting thank you for enlightening me as well. 😀
Sounds like it
There are some great books on this and the ancient side of the development is a good start but things got really cool when industrial extraction got started properly.
The ventilation shafts of old stayed but then extensive systems of flaps operated by actual children took hold. Still, that was not what limited depth of mines. The desire to get clean burning coal eventually forced people to deal with large amounts of water that would seep down. The first steam engines were primarily designed not to move the coal, but for the more challenging subject of removing water from mines.
Also the canari was for finding noxious gases. The presence of flammable gasses was detected by having people walk into a mine with a long pole sporting a candle at the front. These goal was to burn the so called fire-damp before the rest of the workers were at risk.
All in all mining has always been a crazy world, Coal by Barbara Freese is a wild book to read if you’re interested in this world at all.
The trick was to work on a mine with an "old" man who did it every time. Many he knew what to do.
Thank you for the suggestion of the book, now I am definitely curious.
It’s safe to say that short of killing other humans few things have driven as much of our technical evolution than the extraction of rare minerals. For that reason alone you’ll find an endless list of interesting reading on both subjects.
The coal book is what got me started down that rabbit hole. From there you can choose your own adventure. My recommendations are: For engineers- Energy and Civilization by Smil
For normal people- Energy for future presidents (and it’s predecessor Physics for Future presidents) by Muller.
Also adding those to my list, thank you.
A nice trick is to light a fire in a mine level above the working one, the fire updraft and fumes do escape from a vertical shaft purposely built on top of it, the updraft sucks air form the levels below.
You need to arrange it with doors so you can force the fire to suck from the area you like and the outside air to be sucked in the level you want.
But that’s a method doable even at Stone Age tech.
Idk if gas pockets were common, as, ancient digging was superficial and by the time you get the tech to dig further down I imagine they got the tech to protect themselves. In between these two era they just died. I mean, there’s plenty of mine horror accounts from the 1700-1900. The whole industrial era was a gigantic trial and error thing. I remember industrial ventilation devices like hand operated, animal operated, and later steam operated air pumps, and acetilene lamps made “flash proof” to an extent. Problem is, if you get to a gas pocket, even if it doesn’t ignite, you are still really dead. There is no way to replace that much gas with fresh air in time. Having a bird that dies earlier than you is a good warning system, but to escape you have to climb a lot and climbing with little oxygen is not an endeavor that is famous for its success rate. To conclude, early ventilation systems were more about getting enough air to breathe and evacuate the lamps fumes.
Interesting. Makes sense once explained but never thought of it that way.
If you happen to go in a relevant museum, keep an eye to tools and fire related inventions. Ancients spent their whole life with fire and they did that for centuries. It’s impressive the amount of tricks they came up with.
Mining engineer here,
Mining was the single most dangerous job in the world till about 1950. Old mines would use the change in temperatures combined with tunnels designed to encourage natural ventilation. A fire could be started that would "draw in air" and a smoke shaft would be built.
In 2022 we use 2000 hp fans to keep things cool/ clean air. Some extremely deep mines I have been to legit use the largest air-conditioning system the world has to keep the temp at a cool 120F its so hot 5000ft underground
Look at this graph of deaths each year in USA mining
https://www.minesafetycenter.com/mine-fatalities-progress/
Feel free to ask any other mining questions
frakc t1_iuif1o2 wrote
The send one fellow in nonburning oiled cloth to detonate small pockets. Sometimes they died