According to the experts at Wreaken Construction &Mining, all you need is a refinery, a mining laser and a little luck. Most rings in known space are depleted but for the individual there is still some money to be made. The current equipment is not configured to work with ice rings and the best yields will be found on metal rings far from populated space.
Our contact at Universal Cartographics, James Urquhart, was keen to point out that data is available in any of the mapped systems, showing both the type of ring/belt and the level of reserves. Reserves have been categorised from Depleted to Pristine and belt composition comes under one of the four types.