Both displays require dual-link DVI input.
The following setup should work because the Mac mini's Thunderbolt 1 port encapsulates two DisplayPort 1.1 (HBR×4) streams (more details are
here) that can be used to drive two 30" ACDs. They need to be extracted and converted to dual-link DVI. For this you'll need...
The dock will have two DisplayPort outputs: one straight (mini-)DisplayPort output and another one "hidden" in the second (downstream) Thunderbolt 3 port which is a USB-C port.
Plug the first 30" ACD into the dock's (mini-)DisplayPort output (using a male DisplayPort to female miniDisplayPort adapter if necessary) using the first A1306.
Plug the second 30" ACD into the dock's second (downstream) Thunderbolt 3 port using a male USB-C to female miniDisplayPort adapter and the second A1306.