• The title Air Emissions changed from Mass Loading of Point Source Emissions.
• The definition was also refined, to ensure that emissions from HVAC systems, underground ventilation and open tanks and reservoirs are included in the total.
• Historic data has been updated to reflect the changes.

• A number of parameters monitored in Cameco's treated water discharges are compared against the CCME guidelines and formulated into a water quality index (WQI).
• The title Water Quality Index was changed to Treated Water Quality.
• The wording of the definition has changed for clarity, but not for intent.
• Quality checks on the historic data revealed some errors in data entry for a couple of sites; the data has since been updated.

• ISR operations do not currently discharge any treated waters to surface water bodies.
• The title Effluent Volume was changed to Treated Water Discharged.
• The wording of the definition has been changed for clarity, but not for intent.

The wording of the definition has changed for clarity, but not for intent. Minor corrections were made to historic data.

• The wording of the definition has changed for clarity, but not for intent.
• Minor corrections were made to the energy data in historic years.

• Minor corrections have been made to historic energy data; slight increases each year compared to previously reported data were the result - trending was not altered.
• The wording of the definition has changed for clarity, not for intent.

The KPI does not include tailings, waste rock, mineral product, or materials containing sufficient uranium such as to be considered a valuable commodity on the international market.

Data has been updated as the status of some events has changed over time.

• The title was modified from Total un-reclaimed waste rock to Un-reclaimed waste rock.
• The definition has been changed from previous year.