Metal Bulletin low-grade cobalt prices rose to $12.30-13 per lb on Friday, up from $12.15-12.80 on Wednesday, while high-grade prices stood at $12.50-13.20, up 50 cents on the high end. Adopting the often-used definition of a bull market as one that rises by more than 20% from a cyclical low point, cobalt prices entered a bull market on July 15, when the low-grade price reached $10.95, up 21.67% from lows of $9 seen in December. Taking Friday’s price move into account, the low-grade low cobalt price is now up 36.67%