Ores
Bloodstone is a common ore found in flesh biomes (Gloomy Deathgrounds and Staring Hills). It generates in average 6 times per chunk in 8 ore veins between y=-64 and y=24. Requires at least an Iron Pickaxe.
Bloodstone is a common ore found in flesh biomes (Gloomy Deathgrounds and Staring Hills) inside flesh blocks. It generates in average 1 time per chunk in 4 ore veins between y=45 and y=256. Requires at least an Iron Hoe.
Bismuth is a rare ore that can only be found in hot biomes (Ashen Crags, Watching Undergrowth and Windswept Hollow). It generates in average 9 times per chunk in 8 ore veins between y=-64 and y=24. Requires at least a Diamond Pickaxe.
Cinnabar is a common ore that can only be found in the Drifting Monoliths. It generates in average 20 times per chunk in 14 ore veins between y=-60 and y=300. Requires at least an Iron Pickaxe.
Dark Steel Deposit is a fairly common that can only found in the Gaol Of Heretics. It generate in rocks found on the surface of the biome. Requires at least the Ichor Carver.
Fossilized is an uncommon ore that can only be found in flesh biomes (Gloomy Deathgrounds and Staring Hills). It only generates inside spherical nodules or mouths found all throughout these biomes. Requires at least a Diamond Pickaxe.
Grim Soil is an uncommon ore that can only be found under the Windswept Hollow inside Desolate Soil. It generates in average 14 times per chunk in 4 ore veins between y=-64 and y=30. Requires at least a Diamond Shovel.
Lavendite is also very common and can be found anywhere in the Deep Void. It generates in average 6 times per chunk in 6 ore veins between y=-64 and y=18. Requires at least an Iron Pickaxe.
Misted Remains is an uncommon ore found exclusively in the Misted Remnants. It generates in average 8 times per chunk in 7 ore veins between y=40 and y=120. Requires at least a Diamond Pickaxe.
Onyx is a very common that can be found anywhere in the Deep Void. It generates in average 5 times per chunk in 8 ore veins between y=-64 to y=16. Requires at least a Diamond Pickaxe.
Rotten Fossil is a common ore that only generates in the Mourning Graveyard and the Filled Graveyard. It generates in average 14 times per chunk in 18 ore veins between y=30 and y=256. Requires any Pickaxe.
Sulfur is a common ore that can only be found in hot biomes (Ashen Crags and Windswept Hollow). It generates in average 24 times per chunk in 12 ore veins between y=-64 and y=128. Requires at least an Iron Pickaxe.
Voidrium is a very rare ore that can only be found in ancient biomes (Mourning Graveyard, Filled Graveyard, Drifting Monoliths, Gloomy Deathgrounds and Staring Hills). It generates in average 5 times per chunk in 5 ore veins between y=-64 and y=0. Requires at least a Shatterbone Pickaxe.
(See Voidrium for more information)
Most vanilla ores can be found in the Deep Void as "ancient" ores. They drop more ores than their Overworld counterparts.