Get Seabridge out of your head when discussing the high grade option at Brucejack. One look at he IRR abd you can see there is little in the way of parallels. 

Seabrigdge needs Billions to move forward with a 10 year timeline before the first nickel starts to flow back to the shareholders. Pretium will need about $500 million with a very short payback (probably less than 2 years),

Back to the weather -What is your concern- there is no smokestack- there may be weather events- like blizzards and high  rainfall events but they are relatively rare. Pretium has been working year round for the past two winters and now has a road that will be year round this year . When I visited the Granduc millsite in the late 70's early 80's there was reliable acess year round from Stewart to the minesite. Highway 37 is the main road that hauls massive amounts of freight from the lower 48 to Alaska.

I stand by my classification of the ultra high grade intersections as being pockets as the discussion of the geology clearly indicates that this is not a vein style gold deposit but the gold is found both in the quartz and in the country rock but with wldly varying grades over extremely short distances. There may be continuity but from my reading of the Snowden treatment of the outliers it is unlikely.  There is no denial that these massive high grade values do occur and they will show up during the mining. If the gelogists are wrong and you are right this would turn the Valley of the Kings into King Solomons Mines but we will have to wait for the mining  to take place-the sooner the better.

With respect to your comment on the ground conditions-take a look at the pictures of the underground ramp on the recent presentations-minimum rock bolting -no visible water and walls that appear square and consistent- The planned mining method is for large stopes  using a 5 gram per ton cut off.-This mine  will be a low cost underground operation as opposed to shrinkage or some type of vein following method. 

Putting the mill underground is an option  but I have seen underground crushing (in the mine plan) and underground grinding plants (Stanrock mines in Elliot lake Ontario but there were substantial advantages due to topography that made these choices economic) I fail to see any advantage at Brucejack but I trust the engineers to proceed according to the plan as shown on the website.