The ore zone is estimated to be about 39.4 feet (12.0 m) thick, consisting of phosphate sand, fine quartz, clay, and silt.

In 2018, PotashCorp merged with Agrium, another Canadian company, to form Nutrien Ltd, current owner of the mine.

[3] As of 2005 the Aurora mine had estimated proven and probable reserves of approximately 356 million tonnes of phosphate rock at an average grade of 30.7% P2O5.

PotashCorp has rights to exploit an area of 8,900 hectares (22,000 acres) of phosphate-bearing reserves, sufficient to support the mine's operations for around 75 years.

[4] In June 2009, PotashCorp received permission from the US Army Corps of Engineers to mine reserves within the extraterritorial jurisdiction boundaries for a period of 30 years.