- Rock materials are the main materials to construct the dam body. Proposed rock material sites are Quarry 1, Quarry 2 and Quarry 3.
- Quarry 1 and Quarry 2 have suitable quality with enough volume. Both sites have a straight distance of 7.2km to 8.5km from the dam site.
- Quarry 3 in reservoir area, where the rock is welded tuff, is another choice of quarry site of rock material. Welded tuff has the features as rather high absorption ratio and low density.
- Quarry 3 has been selected for rock production site, where welded tuff spreads in reservoir area. This layer spreads under terrace deposit of Percut River. Although material quality is not the best, this place has been selected for quarry because it is close to dam site and environmental impact is small.