They expire July 8, 2019 with a strike price of $1.50, and with the current share price at $1.21 with three years left, they look like they could be a money-spinner. There is an acceleration clause if NMX trades at $2.25, which will cap potential returns, but even then you would get more than a double by buying the warrant at current prices.
Another of my small explorer/developers, Coldquest aka GQC.V has been on a tear lately too. It's now up to 60 cents a share but I wouldn't be surprised to see them hit the former highs ocer a loonie based on what they finding in their copper/gold properties in the Dominican Republic.