This seed spawns you in a forest, but if you walk out of the trees, you can see the mesa stretched out before you. Mesas are a unique, rare biome, and spawning so close to one is a treat. Not only do they look cool with the colored clay and red sand, but they also hold a lot of great things. This one even has one diamond in a chest minecart.
Minecraft PC 1.10.X Seed: 71933245
One special thing in mesas is their amount of gold. In other biomes, you have to go deep in caves before you find traces of gold. In mesas any cave with stone inside has a high chance of containing gold. Depth is not a factor.
Mesas also have abandoned mineshafts on the surface. Sometimes you’ll find chest minecarts right in the open too. This mesa is no different. The mineshaft is pretty far into the biome so it takes a bit of traveling to get there, but it’s well worth it.
To find the mineshaft, head in a generally southern direction until about 153 / 76 / 615. In that area, you can see rails on the clay and dark wood pillars marking the mineshaft tunnels.
You can also find your first chest minecart out in the open in that area. It doesn’t contain the diamond or anything else very exciting, but the best is yet to come.
The diamond chest is in a tunnel at 154 / 66 / 648. Not only is there a diamond, but this chest is also full of lapis lazuli, redstone, and one golden apple. That’s quite a bit of rare loot for a small chest.
Keep exploring the rest of the abandoned mineshaft to see if you can find any more good chests. Then you can journey through the rest of the mesa for more goodies. Happy exploring!