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Conservation offset ratios are based on the premise that restoration recovery after industrial disturbance varies with range site.  Appropriate ratios were evaluated for range sites in the Dry Mixedgrass and Mixedgrass Natural Subregions of Alberta.  Proposed offset ratios are different for each natural subregion due to climatic and soil differences and are are based on relative rates of restoration.  Disturbance of highly sensitive range sites require a larger offset area because they are more difficult to restore.  The proposed offset being provided as part of a pilot project is the conversion of marginal cropland in prioritized areas to perennial native cover, in order to restore important ecological functions.  Verification of the footprint impacted directly by industry in development areas will rely on detailed mapping of the Alberta Grassland Vegetation Inventory (GVI).  GVI is completed in the southern region of Alberta and uses range sites to distinguish differences in native grasslands. Ratios were initially established independently by each of the authors, based on knowledge of restoration rates gained from long term monitoring projects and scientific investigation, including the use and application of the 2010 native grasslands reclamation criteria, range health assessment, plant community succession models, and range plant community guides. Values for the ratios were refined based on recent research, interpretations from detailed investigations, and expert knowledge and opinion.  The authors subsequently collaborated to adjust to common values.