I've spent the past 3 days digging out a whole chunk just to find absolutely nothing and still be greeted with the ore finder saying "Found in Chunk: Raw Copper". What are you actually looking for with this mod? Am I meant to use the drill on normal copper veins? Is it a custom ore vein? If it was the normal copper ore veins there there is definitely more than one of them in the chunk.

The documentation and images on curseforge and modrinth are seriously lacking to the point that I don't even know if this mod is broken or if I'm doing it wrong.

Please, just add some documentation and show what I'm meant to look for!!!

You have to place a drilling machine on a solid block anywhere in the chunk.
You can ponder the ore vein finder to see this.

The ponder does not specify it's a solid block anywhere in the chunk, along with your documentation on curseforge stating it's a "vein" which is a very big change to any block in the chunk. However, thank you for getting back and informing me on this!