Cameco has a three-year program at the 5km long Grid 5 target area.
Work to date has been focused around the northeastern part of what's called the C 10 corridor, where several ground-defined conductive responses of varying strength were identified.
The EM survey is aimed at explaining, locating the conductor and better interpret the location of the fault.
"We have a series of uranium targets at Grid 5. The geological complexity, depth to target, and geophysical data resolution make the area challenging to explore," said Peter Dasler, the president of Canalaska.
"However, the Cameco team has a new geological interpretation and we believe that they are closing in on the most promising targets.
"The structural complexity along the C10 fault system is encouraging for structural uranium traps and the widespread geochemical anomalism emphasizes the movement of fluid in the sandstone column, and the potential for a significant uranium deposit in this area."
Canalaska holds interests in around 152,000 hectares (375,000 acres), in Canada's Athabasca basin.
Shares in Canalaska on Friday are up 1.45% to C$0.35.