The Quarry is an automated mining device that can mine an area that you select. You can attach pipes to retrieve the blocks that it mines. Mining with a Quarry is about 100 times more costly per ore block excavated than mining by hand.
A Pump will move liquids such as Oil, Lava and Water through a pipe. The pipe must be "waterproofed" by adding Pipe Waterproofing to it first. Buildcraft Pumps can be powered by Redstone Engines, making this an easily automated way to move liquids around.
A Miner will dig straight down similar to the Mining Well, but it can also be upgraded to seek out nearby ores using an OD Scanner or OV Scanner. A miner is about 10 times more costly per ore block extracted than mining by hand.