Impassable washout at KM4.8 (road is eroded to about the width of a quad bike). Aggressively-driven AWD SUV can likely make it to the previous switchback at approx. KM4.3, 4x4 HC recommended for the last hill to the washout. If you're in a low clearance 2wd vehicle you'll need to park at the bottom, although anything that can get up the first hill can probably get to KM4.3.

Easy walk on the road after the washout but there are some steep loose sections. If taking a mountain bike it'd be mostly pushing uphill until joining the other road after the turnoff to the mine but a fast rip down.