RE:RE:RE:RE:RE:Direction ...
I look at it from another perspective. The engineering of the dyke at PLS will be somewhat horrendous technically and commercially. The problem is the depth of overburden. The more I look into it the uglier it gets. Dominion Diamond recently submitted the Jay Project for regulatory approval and the project decription is found here (25 MB file, sorry).
https://www.reviewboard.ca/upload/project_document/EA1314-01_S_03_Project_Description.PDF
Have a look at page 3-48 and the subsequent dyke sections. The dykes constructed to date up north have gone to bedrock with an impermiable core/cut off wall. PLS cannot go to bedrock since there is 40-50 m of overburden. Jet grouting will not work since the hydrostatic pressures in the overburden will be too high at depth. It is a method intended for shallow civil work. So it will be necessary to freeze the core instead with vertical freeze holes drilled into the basement rock through the dyke and overburden to establish the impermiable barrier. The shoreline side will need cut off wells or freeze wall also. Fine. When the pit mining occurs though, a 50 metre highwall of overburden is now exposed. The civil engineers will tell you its angle of repose will need to be about 1:3.5 for stability. What this means is the dyke will likely have to be 200-250 metres back from the pit rim (3.5 x 50 plus plus safety benches at the bedrock and top of overburden). So this standback distance (and the need to drill a freeze hole every 1.5,-2.0m) adds tremendously to the capital cost and construction time for this project. So I get pretty quesy just thinking about it. No one has ever successfully done this although it was proposed (and I understand partially implemented) at the Aquarius gold project near Timmins.
https://groundfreezing.net/technical-papers/aquarius-project/
Whereas underground mining at Arrow should be a piece of cake technically. (I was study manager for the Millennium PEA and pre.-feas, mine manager at Eagle Point, mine super at McArthur etc. etc,. you know the drill.) So I get a warm feeling with NXE but an upset stomach with FCU from a construction perspective. NXE however needs to prove out the deposit so there is plenty riding on this winters drilling obviously.