hmmAlthough the shallow and lump [veins] have similar crystalline structures, their grade spectrum or percent carbon (percent C) of the ore species varies significantly. Flake grades usually range from 2-10 percent C, but lump grades like Sri Lanka can easily be above 80 percent C. Amorphous grades in general are 15-30 percent C. There are many implications of this variation of degrees, but the best thing is