Kennon road collapse caused by old mining tunnel, not sinkhole The Mines and Geosciences Bureau (MGB)–Cordillera clarified to GMA Integrated News that the ground collapse along Kennon Road in Baguio City is not a sinkhole but the result of the collapse of an old horizontal tunnel, or adit, from a former small-scale mining site beneath the road. Supervising geologist Raymanne Mabazza said the area has no limestone, ruling out sinkhole formation, and that the tunnel came from an abandoned mine ord

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