From Lexicanum

A Mining World is a sub-classification of civilized world, devoted to industry. These planets possess huge mineral wealth to be exploited.

Mining Worlds include:

• Deliverance - home of the Raven Guard
• Guryan - a planet in the western galactic area which rebelled against the tyrannical rule of Cardinal Bucharis
• Rhanda - the first world Bucharis conquered, allowing him to build his gigantic Cardinal Palace
• Medusa V - the centre of the 2006 global campaign and near to Van Grothe's Rapidity
• Taros - A former Imperial world where the Tau defeated an Imperial army with local support
• Piscina IV - An Imperial world famous for a great battle between the Orks and the Dark Angels

Worlds of the Galaxy

Imperium	Adeptus Astartes Homeworld • Agri World • Cardinal World • Civilised World • Dead World • Death World • Desert World • Feral World • Feudal World • Forge World • Hive World • Ice World • Industrial World • Jungle World • Knight World • Mining World • Ocean World • Paradise World • Penal World • Research Station • Shrine World
Xeno	Xenos World • Daemon World • Exodite World • Tomb World • Maiden World • Crone World • Ork World • Tau Empire • Craftworld

Sources

• Warhammer 40,000: 3rd Edition Rulebook