Guides to working with clay and other materials can be found on the EnterpriseWorks/VITA list of publications.

VOA: special.2009.09.14

The EU sees "especially strong potential" in Greenland's deposits of niobium, platinum, rare earths and tantalum, among the elements on an EU "critical raw materials" list.

BBC: Greenland rare earths: No special favours for EU

To date the permanent five have sanctioned only a very few of the materials on either list.

CNN: What comes after North Korea's nuclear test?

The salvage website allows people to list materials for sale and through it can be contacted by potential buyers.

BBC: Guernsey salvage scheme is set up online