For what it is worth, I just measured the track on Google Maps and it came out as .14 miles around the inside, .18 around the middle and .22 around the outside.

I measured the inside and outside longitudinal and transverse axis several times and averaged them out, then assumed (I know ASS U ME) the corners to be true 180° arcs.

I found it interesting that Google Maps shows the haulers and cars in the pits.