In September 2021, there was no specific information available regarding GameFi mining in the Koii tokenomics. GameFi (Game Finance) generally refers to the integration of blockchain technology and decentralized finance (DeFi) principles into the gaming industry. It's recommended to refer to the latest official sources, such as the Koii Network website or relevant announcements, for the most up-to-date information on Koii's tokenomics and any potential GameFi-related initiatives.