Voga

Voga — also known as the Planet of Gold and Neo Phobos — was a planet with an extremely high gold content. It contained more gold than in the rest of the known galaxy, with rocks being 50% gold, sometimes even higher. (PROSE: Revenge of the Cybermen) Because of this, golden objects were not considered impressive on the planet. (PROSE: Wishing Well)

History
Voga was originally a full sized planet, inhabited by the Vogans. During the Cyber-Wars, the Vogans started supplying the gold dust which was used in the manufacturing of glitterguns. The Cybermen, whose respiratory unit innerworkings were vulnerable to gold dust, tried to stop this by destroying the planet, but one emergency bunker survived, which started drifting in space as a rogue planet. Centuries later, it was captured in Jupiter's orbit. The Cybermen later discovered the planet again and attempted to destroy the remaining gold. The attempt was unsuccessful and the Cyberman were destroyed instead of the planet. (PROSE: Revenge of the Cybermen, TV: Revenge of the Cybermen)

By the 40th century, Voga had been long since abandoned and was nothing more than a lifeless asteroid. Neal Corry and Jaim Gehässig had been sent there to do a documentary on the history of the Cybermen. (PROSE: Legacy)

After the discovery of gold planets such as Voga and Midas Superior, gold eventually became "worthless" to the colonies. By the year 250339, both planets were mined out. (PROSE: Night of the Humans)