O.k., on further reading, I see that strong, and fairly well supported rumors of the "settlement" with EPA were out early last week, driving the share price up accordingly.  Being that the news came on a Friday, and it was expected, it was pretty much anticlimactic.  Hence, the sell off, which took the share price back to about where it was at the open on Monday.

...could be higher next week (along with other minders now that there is strong proof that the Trump administration is behind the mining industry, and not just on behalf of coal miners).

By the way, and speaking of coal, market forces suggest the prices coal attained up to a couple of years ago, will never be seen again.  That said, the same thing does not apply to other minerals. 

Here's more on the Pebble/NAK story.

http://www.mining.com/epa-northern-dynasty-settle-dispute-pebble-mine/