Rock Energy on January 2005, acquired a coal-mining permit at Liguan, Rapu-Rapu Island, Albay. The company, BatanCoal Resources Corporation took over the mine development. The phase one of the project was completed last 2008 and phase 2 of mine development is on going. Commercial production started on December 2013 with a total expected extraction of 125,000 metric tons over a period of 2 years. This underground coal-mine of the company produces good quality coal with following specifications:
- Total Moisture – 14%
- Inherent Moisture – 7.0%
- Volatile Matter – 40%
- Fixed Carbon – 38%
- Ash – 16%
- Calorific Value (air-dried) – 5800 kcal/kg
- Sulfur – 0.7%
The modest production of approximately 3,000 metric tons a month are all sold to a manufacturing plant in view of its coal quality.