Okay Venturevestor, you are almost half way there: they can store 50,000 tonnes of concentrate at any time.
Now look at the concentrate that Schaft will produce annualy (A) and divide by 360 days (B) a year: 445,000 tonnnes/yr divided by 360 days a year = 1,236 tonnes a day.
Stewart can store over 40 days of concentrate at any one time.
As far as the HwY, we are only talking about 35 trucks a day (each truck carrying about 35 tonnes). The HWY will have no problem with a truck every half hr or so.
When Weyerhaueser Canada decided to truck over 1 million cubic meters instead of barging it, the put 78 trucks a day on Hwy 19 on northern Vancouver Island which is not half as good a hwy as Hwy 37 (more, steeper hills, more bad turns, and few passing lanes, and more traffic).