They are buying something. Most likely ROD as a fair few have said. If ROD then most likely followed quickly by a reason e.g. they are going to put ROD trial ore through the mill - that's why I think it's going to be up in the air about whether the TH is forebearer of good or bad news. Bad if they are using it to soften the blow of a failed Stacpoole trial and good if Stacpoole awesome and they want to consolidate both mines as part of a long term board plan e.g. prove Stacpoole for short term cashflow, consolidate ROD so they can do what they want with it, ramp up ozs by supplying mill feed from both mines.
Either could be a plausible reason. Friday beers will start early today.
Also, maybe someone had to sell some shares yestersay due to conflict of interest... stranger things have happened.