Field testing ISR technology at the Phoenix uranium deposit at Wheeler River. Credit: Denison MinesDenison Mines (TSX: DML; NYSE-A: DNN) began full construction at its Phoenix uranium project in northern Saskatchewan, by starting installation of the first perimeter freeze wall after finishing site preparation. The C$700 million ($500 million) project, roughly 800 km north of Regina, could produce about 9 million lb. Funding baseDenison held C$418 million in cash and equivalents, 1.85 million lb. of U3O8 worth about C$216 million and C$33 million in uranium investments as of March 31.