Copper alloy tech research

[Dosboy]

Can anyone help me find the research for "copper alloy tech"? I have a level 6 research bench with ancient science books and Engineer research with most tech researched (except most mining stuff). I've looked through all the research menus 3-4 times and can't find the upgrade in the Tech tree for "copper alloys". I've found it in all my past games. I am playing with "Genesis" but this is a vanilla research so it should be the same.

Any help would be greatly appreciated, like which category it should be in, etc in the Tech research tree. It's nowhere to be found on my tech tree unless it comes with another research. Thanks

[Radiosity]

It's a level 4 tech, has no prerequisites, and requires a single engineering research artefact. If you've got a tech 6 bench, it should be there, so quite possibly the mod's messing with it in some way.

[Dosboy]

I found it! It shows up under "core" after you do some other research (that doesn't even mention "copper" at all). Thanks for your help.