Correlation of Landslides to Rainfall within Philex-Padcal Mine and its Vicinity


Felixberto Q. Cuyos1,Violet Irene T. Hizon2, Jocelyn B. Galapon3 & Redempta P. Baluda4

1 Senior Geologist
2 Geologist
3 Department Manager- Geology
4 Division Manager Geology, Environment & Community Relations




Philex Mines is located within a very steep and rugged terrain in the southern foothills of the Cordillera Central Mountain Range. The climate is tropical monsoonal and characterized by a pronounced rainy season from May to October and dry season during the rest of the year. Due to steep terrain and high rainfall, slope failures can occur along the Philex-Kias provincial road and other areas within the mine camp.


This paper aims to report the correlation between rainfall and slope failures based on data gathered from1990 to 1993 using the rain gauge loaned by Philvolcs to Philex in the aftermath of the July 16, 1990 earthquake.

The analysis showed that a rainfall of 23mm per hour to 107mm per hour could trigger a landslide depending on the intensity, duration, and frequency of rainfall.



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