The new project members, Colin Lindsay and Mike Robart, will report to the vice president of operations, the company said in a statement.
With more than 30 years of experience in the mining sector, Lindsay holds a bachelor of science in the field of extractive metallurgy.
After 12 years in plant operations in the African Copper Belt following graduation, Lindsay moved to Namibia to join Rossing Uranium, as a technical and operations superintendent.
For the last six years Lindsay has been engineering manager for the Kabanga Nickel project.
Under his new role, he will be in charge of overall implementation and the execution of a prefeasibility and feasibility study, the company said.
The second new member, Robart, will participate in the planning and execution of metallurgical testing programs for the Strange Lake deposit.
He will also assist in analyzing the results of the metallurgical testing programs, as well as with the development of process flow sheets and the selection of process design criteria for the selected flowsheet.
Robart has expertise in solvent extraction metal recovery process development and also has hands-on experience in design and execution of pilot plant programs for the mining industry, Quest said.
"The addition of these new members to the operations team greatly strengthens the technical expertise that is being brought to bear in the development and advancement of the Strange Lake B Zone deposit through the study phases," Reno Pressacco, vice president of operations, said in a statement.
Quest's Strange Lake, B-Zone deposit is located in Quebec and is one of the largest heavy rare earth resources in the world.
The mineral deposit is exposed at surface and amenable to a low-cost open pit mine with the potential to provide a long-term, stable supply of separated and refined heavy rare earths.
With its unique resource, the Strange Lake deposit has the potential to contribute to lessening of the projected supply deficit in critical rare earths.
Rare earths are a group elements critical in the development of clean energy technologies including electronics, hybrid vehicles, permanent magnets, green energy platforms and advanced technologies for national defence.