The BlackCoin developers have done something really clever.
a) The developers + mining cartels + some independent miners have instamined the coin in one week
b) Switched the coin over to a Proof of Stake system, constricting the supply.
c) Created a mining pool that mines other coins and uses the proceeds to buy Blackcoin. There by pumping up the price.
It is an excellent pump and dump scam. While the price might go up for a day or two, it is too late to get in. If you buy now you will end up being dumped on.