via Bing Maps
If my assumptions are correct, that off-ramps visible in Spring of 2012, for the purposes of drilling on Mallard Lake during winter of 2011/2012, and that a Deposit exists under Mallard Lake, then look no further than the cells of Mallard Lake TMF being drained.
There is evidence that the lake bottom is beginning to emerge in Spring of 2013 in the South West portion, but the water level in the lake must be low because lake bottom is beginning to poke out in the main cell.
Remember this was almost a year ago now.
Toggle between 'Birds-Eye view' and 'Aerial View':
http://binged.it/1f5kPSP
-F6