04/07/2013 · The hill is being quarried by Lafarge. Gua Kanthan is the largest known cave in Gunung Kanthan, which is near Chemor, north of Ipoh, in Perak, Malaysia. Many parts of the hill have already been quarried. Pan Malaysia Cement Works Bhd (PMCW) started in 1964, they became Associated Pan Malaysia Cement Sdn Bhd (APMC) in 1967.