Notice was given in the December 5, 2009 Canada Gazette, Part 1 that, for the first time, facilities must now consider the quantity of NPRI-listed substances contained in tailings or waste rock to determine whether the releases fall within new mass reporting thresholds of the program.

Prescribed facilities are those whose employees worked a total of 20,000 hours or more for the calendar year and where tailings or waste rock were generated or disposed of as a result of the extraction or recovery of bitumen, coal, diamonds, metals or potash, or the extraction or beneficiation of metallic ore or ore concentrate, in relation to tailings and waste rock for the years 2006, 2007, and 2008.

Mass reporting thresholds exclude the quantities of substances contained in unconsolidated overburden, waste rock that is inert or clean according to a valid federal or provincial operating permit for the facility and components of tailings that are inert, inorganic and have not been reduced in size or otherwise physically or chemically altered during extraction, recovery or beneficiation.

The Notice itself can be viewed as part of the Canada Gazette, Part 1, through the following link: http://www.gazette.gc.ca/rp-pr/p1/2009/2009-12-05/pdf/g1-14349.pdf#page=6