From Mineweb:

The UK's British Geological Survey (BGS) has produced a new supply risk index for chemical elements or element groups which are of economic value. The listing rates the risk to supply disruptions due to rarity and/or potential for political risk to availability for 52 key elements in 2011.

The BGS notes that the position of an element on this list is determined by a number of factors which might impact on supply. These include the abundance of the element in the Earth's crust, the location of current production and reserves, and risk arising from the political stability of those locations.

In its introduction to the publication of the listing on its website, the BGS says, "The risk list highlights a group of elements where global production is...

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