Mining? That's when you take mat corners or a mat with a smaller hole than the original painting and move it around to find gems. Cropping is the actual cutting of the original for framing. At least that's the way I define those words. Anyway, I spent some time this morning mining the first painting I did last week at the mixed media workshop. The original is 18 x 24 and most of these minings would be framed so they show something like 4 x 6. I'm aware that some of these possibilities overlap so they couldn't all be framed as they look. That's the beauty of Photoshop! Do you have favorites?