Stock saleferret,
Using the title "insider trading" to your post is very misleading. While it may be your intention to foment negative connotations about the company and its prospects, that is far from the case. The principals of explorations companies typically do not take home any kind of salary whatsoever. Bill Gates did the same thing, during the great bull market run on Microsoft. In doing so, he literally left hundreds of millions on the table.
The sales were conducted after the results were known, so nobody could accuse him of acting on insider information. Had he waited until just prior to when the next drill results are known, then he really would have been vulnerable to accusations of “insider knowledge.”