I have a new (2018) Mac mini with all the Thunderbolt 3 ports. I still have my excellent 30" Apple Cinema Display with its weird dual link DVI needs — a thunderbolt 2 port AND the USB connector. I've read (repeatedly) that the Apple adaptor (from TB 2 to c) does NOT address the "mini display port" needs of this monitor. In any event, I read this one does and … it does. Immediate plug and play and it works. On the off chance this is your problem too — here's proof positive of a very economical solution. Onward.
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