Wow! Right Next to spawn there is an incredible abandoned mine shaft! It's really cool to explore, has many caves, and even a massive crevice in there. After 30 min of exploring I found two chests, (Diamond and Iron mostly) and two spider spawners mixed in with cobweb. There is poor lighting and water pouring in, so I suggest using this seed in creative mode for exploring purposes, but this could be a really fun in survival! I myself want to explore this with friends on survival for a fun game. I have seen a lot of the mine, but have not found an actual entrance, just where it links up to a hole in the ground. Also, at the start, when you fall down the hole, there is water blocking the entrances, you will still easily see the entrances, but know that u need to light things up down there! Please, If you find an actual entrance post the coords. Have fun exploring, and do post coords of chests, spawners, or anything else you can discover in here! Have fun!

Additional Notes

Seed is 2572945
Coords of Entrance is
X:163.350
Y:64.492
Z:244:768

Have Fun!