The unique properties of biochar give it the potential to be applied to many different GHG-reducing applications. This project explores using biochar as a cap for tailings ponds to minimize methane emissions. It includes building a small bioreactor, creating tailings pond conditions, adding biochar with specific bacteria, and then carrying out analysis to measure effectiveness and nail down the science behind the idea. This work is an important step towards a future demonstration project that would design and place biochar mats on a tailings pond.