Pica one mineral block and get the whole grain.
Vein Miner 1.7.2 and 1.7.10 is a mod that will make life easier for us, or rather will allow us to collect minerals in a faster way. It does this by causing the chopping block a vein of mineral coal, obtain all resources in that vein, with only one chop block.

Detail and Download here : Vein Miner Mod

Homepage: Mods for Minecraft