oa Formation of Sinkholes in the Kinta Valley, Perak

The first documented occurrence of sinkholes in the Kinta Valley was reported in the 1950s when a sinkhole occurred beside a railway track near Pengkalan. Since then, sinkhole occurrences were documented in the archives of the Minerals and Geoscience Department. The incidents of sinkhole occurrence reached a peak in the 1970s and 80s just before the collapse of the tin-mining industry in the Kinta valley where more than 50 sinkholes were found in the Lahat-Bukit Merah area.