NexGen Energy Ltd. reported initial results from a radon in lake water survey by RadonEx Exploration Management Ltd. at 100% owned Rook I property, located in the southwest part of Saskatchewan's Athabasca Basin. Highlights include: A multi-point on480 m long by 20 to 150 monwide radon in lake water anomaly has been discovered on400 m northeast along strike from the Arrow zone; Radon values up to on10.4 pCi/L are in the same range as the radon values that lead to the discovery of the R390E R780E zones at the adjacent PLS property by the Alpha-Fission joint venture; This radon anomaly discovery has developed a high priority drill target that will be drilled during the ongoing winter 2015 program; Location of this clustered radon anomaly is optimally situated where the southeast dipping VTEM conductor is projected to reach the unconformity. A detailed airborne VTEM Plus and magnetometer survey on 100 m line spacing was flown over the northeast strike extension from the Arrow zone.

The Arrow zone is associated with a north-northwest cross-cutting structure, which is interpreted to repeat at least three times within a 4 km section northeast along strike from Arrow. Favorable magnetic and gravity settings are also associated with these recently located VTEM conductors. As a follow-up to these encouraging VTEM results, a radon in lake water survey is in progress with a focus on these prospective cross-cutting structures.

RadonEx Exploration Management of St. Lazare, Quebec has been contracted to conduct an approximate 1,700 station radon in lake water survey over VTEM conductors beneath Patterson and Beet Lakes. Detailed radon sampling has just begun along an approximate 4 km strike length to the northeast of the Arrow zone with 309 samples recovered thus far. In General, sample location spacing is 20 m apart along lines that are 50 to 100m apart.

Radon results will be released as they become available, and are interpreted.