i found a cave that has a waterfall/stream and a lava fall if it dig a trench from the water to the lava that will give me obsidian?
oh i used my old house which was in a hill side until a creeper popped in to say hi now it's a openish mine.
even found six diamonds in there so far though that was a long way down
built a new home on a island might do a covered tunnel from there to my mine