Land Mine, Ichor Pit, and Gun Battery marker sizes?

Hey all,

I've been working on making tokens to represent the different objectives and "interactables" from the Core book, and I'm a bit stumped about how big to make some of them. I cannot find specific base measurements for some of the on the "interactables", specifically the Gas/Explosive Mine tokens, the Ichor pit markers, and the Gun Battery markers. Guidance is much appreciated! Thank you.