Environmental groups have long called the tailings lakes in the Alberta oilsands Canada's toxic secret, but companies operating there will soon be required to disclose exactly what pollutants are there. In April, a Federal Court ordered Ottawa to make the mining industry release a complete inventory of what material they release into the environment. Now companies in the oilsands will also have to comply, CBC News has learned... The Mining Association of Canada is concerned about how the new pollution numbers will be interpreted by the public, Justyna Laurie-Lean, vice-president environment and health, said...