February 2, 2014 | Geological Society of America
"A critical mineral is one that is both essential in use and subject to the risk of supply restriction." This definition accompanies a short article and position statement on the Geological Society of America website.
Recovering Rare Earth Elements from Mine Tailings?
September 6, 2013 | USGS
"USGS scientists are reanalyzing rocks, minerals and associated mine tailing samples – some collected 120 years ago – to assess their rare and critical elements, which could become potential for economic development." Quoted from the USGS press release.
Related: What are rare earth elements?
Big Rare Earth Find in North Korea?
January 21, 2014 | Voice of America
"A recent geological study indicates North Korea could hold some 216 million tons of rare earth minerals [...] if verified, the discovery would more than double global known sources and be six times the reserves in China, the market leader." Quoted from the Voice of America article.
Related: What are Rare Earth Elements?