Ok, got it. I figured the W part but the D...could have been a number of things. I posted the comparative production and net income charts from that Seeking Alpha article to the Photos section. This company has always seemed to do a good job at managing their cash. I think Fred watches the pennies like a hawk.

Did you notice the logo on the haul truck in my user picture? ;^)

p.s. In case you were wondering...that's a toy truck, but the rocks in it are real...they are from the El Chivo mine.