some seller (real or fictitious, who knows) keeps on coming in...

some seller (real or fictitious, who knows) keeps on coming in and out at different prices for 900,000 shares. I think, he is trying to force the sellers to go under him and picks up the stock himself. This way the price is kept artificially low even though the gold price is on the march and the stock should be on the way up as well. Has anybody else noticed that?