THE ILIMAUSSAQ COMPLEX

Sitting behind the town of Narsaq in southern Greenland is the Ilimaussaq alkaline complex, a unique geological setting.  Economically, the most important rock unit forms an undulating, horizontal layer several hundred metres thick that is strongly enriched in rare earth elements, uranium, lithium, zirconium, zinc and fluorine. This rock called lujavrite, persists for over 50 square km, and forms the basis of the project.

Mineral resource estimates have been established at three locations within the project area; Kvanefjeld, Sørensen, and Zone 3. Each resource represents outcropping, or near-surface expressions, of the lujavrite seam. Resource estimates are compliant with the Australian Joint Ore Reserve Committee code, 2012, and were prepared by SRK Consulting. To date, over a billion tonnes of mineral resources have been established. The resource contains one of the largest inventories of rare earth elements and uranium globally (11.1 million tonnes of rare earth oxide, 593 million pounds U3O8). The resource table, as of February 2015, can be viewed here.

All Project Locations v2

 
The highest density of drill hole data is at the Kvanefjeld deposit, where part of the resource is categorised as ‘measured’. An ‘ore reserve estimate’ has also been established at Kvanefjeld. Mineral resources at Sørensen and Zone 3 are in the ‘inferred’ category, but their geological similarity to Kvanefjeld suggests that further drilling will readily see resources shifted to higher confidence categories, and ultimately converted to ‘ore reserve’ status.

Economic grades of rare earth, uranium and zinc mineralisation occur in the upper portions of the lujavrite seam and range from a few 10’s of metres to well in excess of 250m in true thickness. In addition to rare earth, uranium and zinc, the mineralisation is also enriched in lithium, scandium and zirconium.

Rare earth’s, and to a slightly lesser extent uranium, are predominantly hosted in rare phospho-silicate minerals (steenstrupine), with much of the balance hosted in zirconium-silicate minerals (lovozerite group). Non-ore mineralogy is dominated by sodic silicate minerals such as arfvedsonite, albite, and feldspathoids. Zinc is hosted in sphalerite, which is disseminated through lujavrites, and is the only sulphide mineral consistently present.

Ilimaussaq alkaline complex, a unique geological setting.

Ilimussaq Intrusion Geology