Two old sector collapses occurred during the older stages of volcanic activity. Their collapse scars are noticeable on the southeastern-southern and northwestern areas of the summit. The first is high and long, the second long and many high. Hydrothermally altered breccia with block sizes of several from the first collapse fills a valley on the western slope of the volcano. Compared to the younger collapse, they are much narrower and have a highly unusual rectilinear form. These collapses occurred about 450,000 years ago along the strike of a normal fault that cuts across Ollagüe. Like in the young collapse, the summit was unaffected. The lava domes that form the western rim of the summit crater have been subject to smaller sector collapses as well.