Mineshaft



Abandoned Mine Shafts are a type of structure added in Beta 1.8, along with Strongholds and NPC Villages.

Structure
Abandoned Mine Shafts are a series of straight intersecting tunnels 3 blocks wide. They have uneven ceilings with a height of 2-3 blocks. Wooden planks and Fences make up the supports of these tunnels. Incomplete sections of minecart tracks can be found at the floor of these shafts and torches are occasionally placed on walls. Cobwebs are placed at random within. Large, collective masses of cobwebs harbor Cave Spider spawners. Occasionally, stair-like tunnels can be found.

Cave Spiders are exclusive to these areas. There are chests spread throughout the mine that contain resources such as Gold and Iron ingots, ores, food, or seeds. They may even contain diamonds or pickaxes. It is possible (but rare) to have one spawn in an Ocean Biome, causing the shaft to be flooded. Abandoned Mine Shafts are also rich with ores such as Iron, Gold, and rarely Lapis Lazuli and/or Diamonds. As the 'shafts' are made of Wooden Planks, Abandoned Mine Shafts provide very good source of wood while prospecting underground. These Mine Shafts are also considered Dungeons, because a Cave spider Spawner always exist there


 * Obtainable items:
 * Diamond
 * Coal
 * Lapis Lazuli
 * Redstone Dust
 * Iron Ingot
 * Gold Ingot
 * Melon seeds
 * Pumpkin Seeds
 * Bread
 * Rails
 * Iron Pickaxe

Exploration
Abandoned Mine Shafts may be large and be akin to labyrinths, making it difficult to keep bearings. The venomous Cave Spiders are very common and make exploration dangerous unless prepared. However, due to automatically placed torches, the presence of other mobs is much lower, making areas aside from the Spider spawners safer than caves. Gravel sometimes collapses into shafts, making them appear dead ends. Dig a few blocks past gravel walls found to be sure if the shaft continues or not.

Using large amount of resources found in Abandoned Mine Shafts, the player may cut down cobwebs, take out wood from the supports, and create a safe room with a bed within the shafts to work out of. This makes exploration easier, although becoming lost means losing resources within the room and possibly death from the Cave Spiders or other hazards within the elaborate structure. One should put caution before anything else when exploring these locations.

Glitches

 * Due to a world generation glitch, parts of the Abandoned Mineshafts may be floating in the area. This is most noticeable when an Abandoned Mine Shaft intersects an underground ravine, where as the wooden supports for shafts can be found floating. Chests and Minecart tracks are also included in this.

Trivia

 * In the 1.8 Pre-Release 1 and 2, support beams in mines were only made of planks. Fences were added later in the 1.8 version.
 * Some spots in/around the mine shafts have been known to have a strange terrain generation that causes a random 'room' in the mine with a dirt flooring, usually fairly large, with no observable purpose. These are much like circular chambers in cave systems from the generation code. Whether this is a bug or intended is unknown.