GregTech ore mining levels needed
For simplicity I used stone versions of the ores, rather than endstone, netherrack, or red/black granite.

Small Copper - level 0
Small Tin - level 0
Small Bismuth - level 0
Small Coal - level 0
Small Iron - level 1
Small Lead - level 0
Small Zinc - level 0
Small Gold - level 1
Small Silver - level 1
Small Nickel - level 1
Small Lapis - level 0
Small Diamond - level 2
Small Emerald - level 1
Small Ruby - level 1
Small Sapphire - level 1
Small Green Sapphire - level 1
Small Olivine - level 1
Small Topaz - level 2
Small Tanzanite - level 1
Small Amethyst - level 2
Small Opal - level 1
Small Jasper - level 1
Small Blue Topaz - level 2
Small Amber - level 1
Small Fool's Ruby - level 1
Small Red Garnet - level 1
Small Yellow Garnet - level 1
Small Redstone - level 1
Small Platinum - level 1
Small Iridium - level 3
Small Nether Quartz - level 0
Small Saltpeter - level 0
Small Sulfur - level 1

Naquadah - level 4
Enriched Naquadah - level 4 (Note 1)
Lignite Coal - level 0
Coal - level 1
Magnetite - level 2
Iron - level 2
Vanadium Magnetite - level 2
Gold - level 2
Brown Limonite - level 1
Yellow Limonite - level 2
Banded Iron - level 2
Malachite - level 2
Tin - level 1
Cassiterite - level 1
Tetrahedrite - level 2
Copper - level 1
Stibnite - level 2
Nether Quartz - level 1
Sulfur - level 2
Pyrite - level 1
Sphalerite - level 1
Chalcopyrite - level 1
Bauxite - level 1
Aluminium - level 2
Ilmenite - level 3
RockSalt - level 1
Salt - level 1
Lepidolite - level 2
Spodumene - level 2
Redstone - level 2
Ruby - level 2
Cinnabar - level 1
Soapstone - level 1
Talc - level 2
Glauconite - level 2
Pentlandite - level 2
Garnierite - level 3
Nickel - level 2
Cobaltite - level 1
Sheldonite - level 1
Palladium - level 2
Platinum - level 2
Iridium - level 4
Pitchblende - level 3
Uranium 238 - level 3
Uraninite - level 3
Plutonium 244 - level 3 (Note 1)
Bastnasite - level 2
Monazite - level 1
Neodymium - level 2
Wulfenite - level 3
Molybendite - level 2
Molybdenum - level 2
Powellite - level 2
Scheelite - level 3
Tungstate - level 3
Lithium - level 2
Almandine - level 1
Pyrope - level 1
Sapphire - level 2
Green Sapphire - level 2
Grossular - level 1
Spessartine - level 2
Pyrolusite - level 2
Tantalite - level 3
Quartzite - level 1
Barite - level 2
Certus Quartz - level 1
Graphite - level 2
Diamond - level 3
Bentonite - level 2
Magnesite - level 2
Olivine - level 2
Apatite - level 1
Phosphorus - level 2
Phosphate - level 1
Galena - level 3
Silver - level 2
Lead - level 1
Lazurite - level 1
Sodalite - level 1
Lapis - level 1
Calcite - level 1
Beryllium - level 2
Emerald - level 2
Thorium - level 2

Note 1: handling these ore blocks (even before processing them at all) without a hazmat suit causes multiple bad status effects; having more than a stack of each isn't enough to be fatal on peaceful difficulty, but 1 Enriched Naquadah Ore gives them more duration than 1 Plutonium 244 Ore.