Nice quarry and colors,a nice picture.

I know not of the means, but if you were skilled enough to edit out the graffiti, the picture would be even more spectacular.

Nice comp. lines and colors. It is a spectacular shot. I esp. like the bong graffitti.. ahh.. reminds me of the old days.

Interesting composition, very linear, relieved by the light branches and leaves of the trees. I like a controlled pallette when it is of natural things, and that water looks like it would be a great swimming hole! I wish the pic were in a larger format or, at least, a rectangular one.
The graffitti...it would be easy enough to remove it using a basic (and free) software editing tool like PhotoFiltre.
However, this isn't a picture of an active granite quarry, but of an old granite quarry...hence the graffitti is inevitable and part of the quarry as it is today.

I like the lines and the "marbling" on the rocks. I find the graffiti distracting, but then I'm biased toward the natural look. The composition is good. Even though there isn't much of a focal point, the swoop of the cuts draw the eye straight to the center of the picture.