Large blocks of Ivanhoe Mines (IVN) calls traded on the AMEX today. 22,000 contracts traded total, compared to 200 puts. With shares down 45 cents to $4.36, the activity included 10,000 April 5s sold for 50 cents, 5000 June 5 calls bought for $1.05 and 5000 Sept 5 calls bought for $1.30. The activity appears to be a roll, perhaps closing positions opened in late-Feb when IVN saw heavy trading and open interest in April 5 calls increased from 0 to 23K over the course of 3 days.