Almost all the players who go to the mining, if they do not a cave to explore, create tunnels, but how to make this method more efficent? First of all, do not dig as I said now, with tunnels. The reason is simple: The percentage of minerals and caves that can be found decreases to almost 85%. The best method is to run the F3+G command and see the chunk borders . You have to choose a chunk and start digging it, from level 7 to level 14, or from 8 to 13. In this way, the percentage of minerals increases, making it easier to develop a world. Obviously those heights are suitable for finding Diamonds, Redstone, Lapis Lazuli and Emeralds. To find Iron or Gold, it is recommended to dig from level 37 to level 50. The parameters of block split by layer is equivalent to 256, therefore, digging 2 layers we get to 512 blocks. Through these parameters, you have to adjust on the picks, becuse is advisable to use those i Iron (which cost less), possibly digging minerals with any pickaxe with Fortune Enchant. Thanks for reading!