Maitland Volcano was one of the most voluminous shield volcanoes in the Northern Cordilleran Volcanic Province along with Heart Peaks, Level Mountain and the Mount Edziza volcanic complex. Its structure was about long and wide, covering an area of at least . This is similar in size to the Mount Edziza complex approximately west of Maitland Volcano. Like most shields, Maitland consisted of several basaltic lava flows which have low viscosity. This gave the volcano its massive profile and consequently Maitland might have had a broad lava plateau like other large NCVP shields.