First unlock the quest "Rats!" from the Bartender at the Tavern, next take the other quest from him (i dont remember the name) and now you can access the mine. Explore the mine and find 1 piece of diablosite and show it to the Blacksmith. Buy a pickaxe and now you can have all Diablosite you want :D (there is also a quest from Blacksmith to unlock the Diablosite equipment, you must bring him 15 Diablosites, I think xD)
For the raptor quest... You need to take the quest from the witch at the swamp. I dont know if it need other requirement...