The room consists of many bridges that link to walkways at opposite ends of the room, over a deep pit of Phazon ore. Falling into this pit causes Samus to respawn from the ledge she dropped off of.
This room is also where a Phazon Harvester Drone can be found. The Drone can be seen hovering around the bridges in the room. The Drone harvests Phazon ore from the room, which can be seen in abundance at the bottom of Phazon Harvesting. The bridges slope upwards, which lead to the highest part of the room. These bridges can be destroyed by the Harvester Drone. If they are, they leave Grab Ledges behind for Samus to ascend the room.
Phazon Harvesting is exposed to the Acid Rain of the Space Pirate Homeworld. The metal on the bridges appears to be somewhat resistant to the rain.
A Friend Voucher can be obtained if Samus calls her Gunship in to perform a Bombing Run on the Harvester Drone. This can only be done after the Homeworld's Defense System Generator has been destroyed.