From Mid Minga River

Also Mt Williams (1718m) can also be reached from the mid Mingha River, by climbing (bashing) the steep bushy spur almost opposite the southern end of the Dudley Knob track. This route joins the Mt Williams North Ridge near a prominent buttress. To reach Mt Oates descend to Williams Saddle then follow the easy ridge northwards, sidling under its gendarmes and outcrops on the eastern side, regain the narrow ridge, ascending it to the summit of the high peak.