Alberta oil sands systems guide

In-pit tailings and mined-out pits

Some mine plans use completed pits as locations for tailings deposits and future reclaimed landforms.

In-pitTailings

Editorial review: August 11, 2026 · Colin T. Ashcombe

Process role

Using mined-out space can reduce the need for additional external pond footprints.

How the system fits together

Designs can support water recovery before the deposit is integrated into the final landscape.

Environmental and reclamation context

Physical strength, water quality, drainage and ecological performance still have to meet reclamation objectives.

What to keep in mind

In-pit placement changes the geometry of the liability; it does not remove the need for long-term performance.

High-level industrial education only. Oil sands mines, thermal wells, extraction plants, upgraders and tailings facilities are hazardous regulated operations; this site does not provide operating setpoints, chemical recipes or equipment procedures.