Most of the buildings are collapsed into piles of wood, but some structures still partially stand, along with the remains of more foundations. Be careful because the structures and ground around them may be unstable. Continue past the mine to find several more ruins and tailings piles, which were all part of the same complex during the heydey of mineral extraction in French Gulch. These are all located along a relatively level traverse that the old road takes. Head downhill on a narrower trail about .75 miles further past Minnie Mine to end at the B&B Mine Trailhead, then use the road to complete a loop.

Sources: https://www.alltrails.com/explore/trail/us/colorado/minnie-mine-loop https://www.mtbproject.com/trail/5566515/minnie-mine