at below $4.00 is wsa good buying??

After not holding for at least 18 months i bought back into WSA today at $3.84. Have watched SP slide and slide despite regular consistent flow of +ve updates from company. Mine continues to keep finding more high grade and easily extractable massive sulphide ore-bodies, and production is rapidly ramping-up as new plant is commissioned. This equates to a mine with low production costs and long future. But clincher for me was continuing drop in value of AUD. Fallen from 92-82c(11%) in just over 3 weeks. In combination, these factors result in rapid increase in earnings for WSA... and that's what all investors seek... a stk with outstanding ability to increase earnings quickly, without substantial additional costs.
So do other readers also reckon WSA is good buying below $4.00??