In 2002 gem-quality corundum (sapphire) was found 1.5 km to the southwest of Kimmirut.
The sapphire is hosted by calc-silicate lenses within the
Paleoproterozoic Lake Harbour Marble unit.
http://www.gia.edu/gemsandgemology/18578/22211/2278/back_issue_article_detail.cfm
http://mineralsciences.si.edu/staff/postdocs/gaillou/towardageochofopals.pdf