Occurrence and Growth of Gullies on Mine Disturbed Land

Gullies are erosional features found in both natural and reconstructed landscape. They are indicators of
geomorphic maturity and therefore represent a valuable tool for assessing the performance and sustainability of mine disturbed land following reclamation. Some types of gullies are associated with instability, rapid erosion, and accelerated landform deterioration. Other types are inactive, self-healing and/or subject to gradual change, consistent with the aims of sustainable reclamation. Both types of gullies occur on mine disturbed land following reclamation or premature abandonment. An inventory of gullies at a sand disposal area near Fort McMurray was conducted to identify the types of gullies, their size, associated erosion rates, and self healing tendency. The results of this analysis lend support to the current method of reclamation and provide guidance for future modifications to closure plans. The data can be used to develop a strategy for mine closure to minimize the risk of rapid landscape evolution by gullying. A system of annual monitoring of gully shapes and sizes is being conducted to confirm long term sustainability.