I bet they were pretty selective with their 'grab samples' from the waste/tailing piles. You can't be selecting random pieces to get those results.
The quartz veins throughout most of the NS gold districts are thin and mined with small shafts. Nothing like these exploration companies are looking for. There is nice gold in the mineralized veins (most historical records from the 1880/1890 period show 1-2 oz/t for what was milled). However the veins and stringers are generally very thin. Nothing that could be mined on a large scale.