Abandoned Mineshafts are obvious once you've spotted them, since (with the exception of the libraries within Strongholds)
they are the only naturally generated structures that use wood and fences.
In addition, there are cobwebs scattered around them, especially around Cave Spider spawners.
There aren't any surefire ways of finding Abandoned Mineshafts, but you could start by exploring various caves, and once you see Wooden Planks, you know you've found one.
The Minecraft Wiki page suggests looking for a ravine, since Abandoned Mineshafts are sometimes found intersecting them, and the wood structures will be a dead giveaway.
They're not like Strongholds where you can use Eye of Enders to find them; you'll have to go spelunking if you want to find the mineshafts.
gaming.stackexchange.com/users/18/Kevin Yap
Abandoned Mine Shafts are not locatable by any special means, but they have the characteristic of significant horizontal extent.
Find a ravine , then search its length.
If a mine shaft intersects a ravine, the mine shaft will have wooden bridges crossing the ravine.
There must be a minimum and maximum depth (Y coordinate) at which mine shafts occur, so you could also limit your search to those levels, but I don't see that documented on the wiki.
gaming.stackexchange.com/users/5962/Kevin Reid
I had the same problem (needed melons) and the same quesion (how do I find a mineshaft?)
about a week ago.
I spent about 3 days cave delving hoping to find one without any luck and started to browse through wikis.
SUCCESS!!
Apparently, for whatever reason, there is a near certainty of abandoned mineshafts being generated underneath desert biomes.
Sure, they show up other places as well, but for some darn reason desert biomes almost always have one.
After finding this information I dug under the first desert
biome I found, and sure enough found an Abandoned Mineshaft.
Worked for me.
Might work for you.
Source Check the Exploration section.
gaming.stackexchange.com/users/15095/Ender
Ravines are perhaps the best in game method to find mineshafts, simply because there's a high chance that a ravine will intersect the shaft.
However, the absolute quickest way to find a mineshaft would be to use one of the 3rd party mapping tools
(Cartograph G is probably the best choice for this) to generate a map of your world and a map of fences, planks, and rails and combine them together to get a map of areas that likely contain mineshafts.
Protip:
Generate a 2d
top down map (not the isometric view) to figure out exactly where things are.
The Isometric views of a lot of mappers are confusing for finding exact locations.
gaming.stackexchange.com/users/8675/thedaian
The other option I use when specifically trying to find mineshafts is to build a very tall tower and stand on it, then disconnect.
When you reconnect you get some time before all the chunks around you fully render, which gives you enough time to target all the ravines, mineshafts and lava pools in the vicinity.
(may not be fully in the spirit of exploration :-)
gaming.stackexchange.com/users/6028/Rory Alsop
The fastest way I find mineshafts is by swimming in deep water.
Deep Oceans will crape the top of the mine shafts open.
The same goes with ravines.
Bring some ladders with you to place on the walls to provide air once you get down there.
gaming.stackexchange.com/users/2580/QueueHammer
I happen to have a very good way of finding these, simply explore a stronghold that you find and 9/10 times it has an abandoned mine shaft running through one!
It really works, and you can even prove it if needed.
Example: on the seed "gimmeapoo"
(this spawns you near an npc village that is in a shallow lake!)
you will find abandoned mineshafts intersecting a stronghold at this location (-379, 27, 786).
Be forewarned, very early on you may find random spiders (the regular kind) in the shaft.
This is due to a dungeon that generated above the mineshaft, but at the end of a more different one.
In short, stronghold = mine shaft. also, in the example mentioned above, there is a dirt room at (-437, 21, 854)
gaming.stackexchange.com/users/24890/JacobDaGun
I've found one in single player in a ravine with floating wood blocks and fences around it.
You can also build a tall tower to search for ravines - just remember to create a safe way to get down from the tower.
gaming.stackexchange.com/users/17760/HAt
Like many others say ravines can be found next to shafts, but also a fast but inefficient way is to mine to the bedrock in a two block area like this -- -- -- __
The reason for mining two down is because you may fall into lava mining down by one block.
Then fill the area with tnt to blow up the spaceIf that area does not work move to a different area.
gaming.stackexchange.com/users/20462/austin
I'm on the hunt for melons , and one place I'm fairly sure I can find them is a mineshaft.  Which leaves me back at square one, how do I find a mine shaft?  It seems they were made substantially harder to find between 1.8 and 1.0.  What's the fastest way to find a mineshaft?
What's the fastest way to find mineshafts?
gaming.stackexchange.com
<minecraft-java-edition>
gaming.stackexchange.com/questions/42137
gaming.stackexchange.com/users/5029/John the Green
Start by exploring caves, look for a ravine and learch its length and swim in deep water.  The fastest way to find minesfhafts seems to be by looking for specific biomes and then explore.
It is implied by the community that minesfhafts generate in specific biomes. Third party software usage is suggested.