I'm guessing it's related to TMK and positive initial results from SL-05, and of course SL-03R, at Gurvantes.
TMK saw a significant jump at the end of last week ($0.011 to $0.013), on 56 million shares (1.6%) traded over Thursday/Friday, with a further 15 million (0.4%) traded today.
Anyone who missed out on those gains might see TPD as another opportunity to get in.
TPD Price at posting:
17.0¢ Sentiment: Buy Disclosure: Held