Some guy told recently in the Ergo discord ( https://discord.gg/3M3hjR ), ergopool channel :

 "Dear Ergo Community, I would like to announce that the first mining pool for Ergo is coming in the following days. This pool is using collaterals and smart contracts, and it would be almost open-sourced. Technically, we do not have control over what you mine but as an arbiter collect the money and distribute it to the miners. So, the pool is censorship-resistant and somehow decentralized. We hope this step in Ergo mining at the beginning of 2020, mitigates the obstacles of Ergo mining for small/medium miners and spreads the words of Ergo. So please follow this thread for the news."