OG-Ores Unified
Bringing the classic look back to the ores.
OG-Ores Unified
Note: Not to be confused with OG Ores: Reborn by PrivateMe

OG-Ores Unified
This is OG-Ores Unified. The continuation of the OG-Ores project (2021) in a single repository, with updates. OG-Ores Unified brings the classic ore look to modern Minecraft.

The project supplies four resource pack files. (Listed in order according to the diagram below.) 1. OG-Ores Unified (Standard) 2. OG-Ores Unified Extension (Adds a copper ore in the vanilla ore style) 3. OG-Ores Unified Nether Gold (classic-style Nether Gold ore) 4. OG-Ores Unified Nether Quartz (old Nether Quartz ore interposed onto the new Netherrack texture) 5. OG-Ores Unified Extension Bordered (Adds the styled copper ore with the border.) 6. OG-Ores Unified Bordered (Ores have a 1-pixel border around them.)

Other, Similar Projects
I do not endorse or affiliate with these, but please take a look to see which one is best for you.
Vanilla Tweaks
- Vanilla Tweaks Website (under the "Retro" section)
OG Ores: Reborn
- OG Ores: Reborn by PrivateMe - At Modrinth and Planet Minecraft
Various other Modrinth Packs:
- "Classic Ores" - "Old Ore Textures (With Copper)" - "Old Ores for Java" - "Classic Ores Textures" - ...and probably more!