According to the website of Carmen Copper Corporation (formerly Atlas Consolidated Mining and Development Corporation), the Biga Pit is the tailings storage facility where mine tailings are stored. The same website also indicated that the pH level of the water in the Biga Pit is at 7.5 to 8 and some fish species, such as tilapia, thrive in it. While the Biga Pit may not be a good place to take a dip, it does offer a breathtaking view to visitors of the facility.
You can reach the Biga Pit by getting on a bus bound for Toledo City at the Cebu South Bus Terminal. Once you reach the Toledo fish market, you can hop on a motorcycle for hire to the entrance of Carmen Copper Corporation. There will be some motorcycles for hire close to the entrance that can bring you to the Biga Pit.