you should know that veins are 9 blocks tall in all dimensions and so i recommend mining 3 layers at a time and making your way down. once you have the hammer this will be easier. you can also buff your tools with redstone and you can apply 8 at a time in the tinkers crafting station. also you will need alot of ore so i recommend clearing out entire veins at a time. the quest book will have quests for ores you need as they become relevent so again just follow the book...you will also want to maybe consider using crops for growing bonsai trees and there is a questline for ic2 crops. you can always search nei for what veins ores come from dont forget. primary layer and secondary = top and bottom in between is overlapping in the middle and sporadic or around is randomly throughout and the most rare. for example malachite is the sporadic layer so you will find it the least but throughout the whole 9 block area. you will also need a ton of copper and tin and redstone eventually so its best to focus on those as well. although im sure you figured that out for yourself. small ores in this pack indicate what vein may be below although some of them are unique such as silver which only spawns in small ores and are rare so make sure to get those as much as possible. all non pure ores such as pyrite usually indicate a vein while the pure ores like iron gold tin etc can be randoms that dont mean anything. most ores are not pure ores such as pyrite and technically you arent supposed to get a full ingot out of a furnace but gt5u is kind of janky as its built on gt5 which was incomplete and left in an unfinished state and they never rebalanced it. thats why pure ores like crushed iron give 10 nuggets because its supposed to give more as its a pure ore not a sulfide. and unfortunately this was never fixed and inherited in later versions of minecraft as well. gregtech 6 fixes all of this and its the only complete version made by greg himself. i recommend playing a pack with gt6 like bears den or at least gt5u bears den addition as it uses recipe configs to make it more like gt6 which is much better.
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you should know that veins are 9 blocks tall in all dimensions and so i recommend mining 3 layers at a time and making your way down. once you have the hammer this will be easier. you can also buff your tools with redstone and you can apply 8 at a time in the tinkers crafting station. also you will need alot of ore so i recommend clearing out entire veins at a time. the quest book will have quests for ores you need as they become relevent so again just follow the book...you will also want to maybe consider using crops for growing bonsai trees and there is a questline for ic2 crops. you can always search nei for what veins ores come from dont forget. primary layer and secondary = top and bottom in between is overlapping in the middle and sporadic or around is randomly throughout and the most rare. for example malachite is the sporadic layer so you will find it the least but throughout the whole 9 block area. you will also need a ton of copper and tin and redstone eventually so its best to focus on those as well. although im sure you figured that out for yourself. small ores in this pack indicate what vein may be below although some of them are unique such as silver which only spawns in small ores and are rare so make sure to get those as much as possible. all non pure ores such as pyrite usually indicate a vein while the pure ores like iron gold tin etc can be randoms that dont mean anything. most ores are not pure ores such as pyrite and technically you arent supposed to get a full ingot out of a furnace but gt5u is kind of janky as its built on gt5 which was incomplete and left in an unfinished state and they never rebalanced it. thats why pure ores like crushed iron give 10 nuggets because its supposed to give more as its a pure ore not a sulfide. and unfortunately this was never fixed and inherited in later versions of minecraft as well. gregtech 6 fixes all of this and its the only complete version made by greg himself. i recommend playing a pack with gt6 like bears den or at least gt5u bears den addition as it uses recipe configs to make it more like gt6 which is much better.