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 and with rocks being 50% gold, sometimes even higher. (DWN: Revenge of the Cybermen) Because of this, golden objects were not considered impressive on the planet. (NSA: Wishing Well)
Voga was originally a full sized planet, inhabited by the Vogans. During the Cyber-Wars, the Vogans started supplying the gold dust which would be used in the manufacturing of glitterguns. The Cybermen tried to stop this by destroying the planet, but one emergency bunker survived, which started drifting in space. Centuries later, it was captured in Jupiter's orbit. The Cybermen later discovered the planet again and attempted to destroy the remaining gold. (DWN: 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. (NA: Legacy)
After the discovery of gold planets such as Voga and Midas Superior, gold eventually became "worthless" to the colonies. By the year 250000, both planets were mined out. (NSA: Night of the Humans)