First let me be clear I am long KMR, if someone bought 172 K shares it also means some one sold 172 k shares. So why do you think that is a bullish call? I agree with your bullish sentiment, although I think 2015 will be a far better year as the recent investments will come on line.
That's a $13MM buy. Obviously the buyer feels there is profit to be made going forward. That seems bullish to me. As for the seller(s), I don't know why they sold. Could be they have a bigger fish to fry, maybe they bought in the near term and just wanted out. Its a positive sign to see large trades while the stock is moving up from a long stagnant position.
I'll try to contain my exuberance in the future.