Heaven & Hell bassist Geezer Butler may not be active with Sabbath right now, but the metal legend is keeping busy with a new album and a new book.

According to HornsUpRocks, Butler is working on a brand new album for his long-running GZR project. GZR's 1995 album 'Plastic Planet,' which features Fear Factory's Burton C. Bell on vocals, is a modern metal classic.

Aside from new GZR material, Butler also said he is working on a "book of memoirs." Geezer said that both projects are due for release next year.

Watch a video of Butler's interview below.