Always. ALWAYS. Alwaysalwaysalways use the ultislasher1 certified checklist before mining valuable ore.
1) Find ore
2) Check to see you have iron pick or higher
3) Mine AROUND ore [Lava >:C]
5) Check for unfriendly mobs
6) Oh crap I'm too afraid to mine this
7) Mine ore
9) Prof- SssS -BOOM-
The one rule I have set for myself is to never kill a pig, NEVER! I worship them, I never kill them, and if they do happen to die I will bury them in loving memory. I don't remember a time when I did kill one. And yes, this means I DON'T LIKE BACON!
Wow! I have the exact opposite rule! I always kill pigs no matter what I'm doing.