TIMELINE-Enbridge's Northern Gateway oil pipeline proposal

(Repeats from earlier April 21 with no changes to text) April 21 (Reuters) - Here are some key dates in Enbridge Inc's bid to build a 525,000-barrel-per-day pipeline from the Alberta oil sands hub of Edmonton to Kitimat, British Columbia, on Canada's Pacific Coast. The proposed C$7.9 billion ($7.17 billion) project has run into fierce opposition from aboriginal communities and environmental groups, and cost estimates have more than doubled since it was first announced. The Canadian g