License: CC BY-NC 4.0 (https://creativecommons.org/licenses/by-nc/4.0/)

References:
Inspiration came from the dirty ore mod from Fentus (https://forums.factorio.com/viewtopic.php?f=179&t=21354)
Ore Flotation cell and ore leaching plant are taken from Arch666Angel's refining mod (https://forums.factorio.com/viewtopic.php?f=185&t=24906), that was released under CC BY-NC 4.0 License (https://creativecommons.org/licenses/by-nc/4.0/). Artwork is by YuokiTani(ore floatation, ore leaching), ADKrieg (clarification plant).

special thanks to
Arch666Angel for releasing his mod under CC so that I could steal ... errr I mean borrow his assets and part of his code.
Kyranf, Rsendig91, Degraine - helped me a lot in the #factorio-modding channel
Klonan for telling me how to detect liquid usage in steam engines.