The Mining Well digs a hole straight down. It stops once it encounters Lava or Bedrock. Mined blocks are replaced by Mining Pipe and put in (in order of precedence) an adjacent inventory, BuildCraft Pipes, or thrown in the air. Removing the Mining Well will delete all Mining Pipes directly below it. It uses 25 MJ per operation and, given sufficient power, has a maximum mining speed of one block per tick.