Cover Crop Program for Pond 5 Tailings Sand Stabilization

This study evaluated the feasibility of using native plant species to stabilize tailings sands at Suncor’s Pond 5 during temporary reclamation efforts. Initiated in 2010, the research focused on plant growth and adaptation in nutrient-poor, high-pH, hydrocarbon-affected sands, with particular attention to the effects of alfalfa pellet amendments.

Results showed that a native grass seed mix produced significantly higher biomass and ground cover than June grass or fringed brome alone, with alfalfa pellets aiding moisture retention and nitrogen release. Root development reached depths of up to 26 cm by year two, and microbial populations increased substantially for June grass and native mixes. The study confirmed that native species can grow directly on tailings sands without soil cover, though future seed mixes should better reflect Boreal mixedwood species for improved ecological compatibility.