Weathered Cut Copper Slab is a cut copper variant of a slab that has undergone further oxidation. It generates naturally in trial chambers. Weathered cut copper slabs can be mined with a stone pickaxe or higher. If mined without a pickaxe, they drop nothing.

They can be crafted using weathered cut copper or obtained through stonecutting. Over time, they will continue to oxidize into fully oxidized cut copper slabs unless waxed with a honeycomb to prevent further oxidation. Weathered cut copper slabs function like other slabs in terms of placement and collision. They can also be placed under note blocks to produce a bass drum sound.