I received an answer from a quite comprehensive and complete answer from support.
I copy paste it here.
Thanks everyone for your help in this matter.
Sep 9, 2020, 11:39 GMT+2
My name is Kelly from the support team. I’ll be your case manager, nice to e-meet you
Thank you for your interest in Fairphone and for reaching out. It’s great to see more people looking further into supply chains and the treatement of workers.
A great place to start to get a better idea of how we are making a difference in the industry is to have a look at our Impact Webpage.
Our products are indeed manufactured in China, at Arima where we have established a number of initiatives to improve working conditions for everyone, not just those working on our products.
I invite you to look into Our partnership with Arima and meet the makers.
To look further into our value chain, and where the materials come from, please feel free to explore our page Mapping the Journey of your Fairphone.
We provide a lot of further information online about our Fairtrade gold supply, the launch of our Fair Cobalt Alliance, and mining conditions in our blog.
I hope these links for further reading and transparency in Fairphone production are helpful for you.
I thank you for your commitment to looking beyond a product and exploring the ethics of supply chains. We share your mission and passion for change in the electronics industry specifically. If you have any further questions, I am more than happy to assist you further.
I wish you a great day!
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ps: i had to edit links if admin wants to correct them as new user can only post 2 urls.
Edit by @alex21: Done