Blocking orders

Hi All, Just for some background. This is my first post on Hot Copper although I have been following your comments as an outsider for a couple of years now. I bought into ABU at the height of the Old Pirate startup (2 years ago) and with the numbers the company supplied I thought my investment was a no brainer. I obviously got my fingers burnt although I have averaged down a lot since then and I am more comfortable with my average now, although I've invested far more than I originally was going to. Over the last few weeks there looked to be some really good movements in the share price however there are now some quite substantial orders on the sell side at every 0.5c that seems to be blocking any upward movement . Any thoughts on whether this is deliberate to hold the price lower or just a large holder trying to exit.