Water management target at the Tujuh Bukit Gold Mine is to maintain the closed water process and utilize rainwater for other activities, and avoid taking water from sources outside of it.
For operational needs—such as processing ore, spraying road dust, and washing heavy equipment and light vehicles—the Tujuh Bukit Gold Mine only uses water from rainwater collection ponds; do not use water from rivers or other bodies of water. Meanwhile, for domestic needs—such as office facilities and employee accommodation—the Tujuh Bukit Gold Mine utilizes groundwater from several drilled wells that already have a Groundwater Extraction Permit.
The rainwater collection pond at the Tujuh Bukit Gold Mine is very effective due to the high rainfall at the mine site (2,500 mm/year). Excess water is channeled into three rivers through three points of compliance, by first being collected in a control pond for monitoring and monitoring minus the sediment in it. At one point of compliance receiving water from multiple pools, the water is treated in a Detox Plant or detox plant to be removed of all potential contaminants. All of these compliance points have been regulated and obtained permission from the government, and are monitored regularly.
In 2021, the use of water at the Tujuh Bukit Gold Mine for operational needs decreased by 13.5% compared to 2020, due to the leaching irrigation process 2020. On the other hand, the water intensity in 2021 increased by 9.7% to 10.8 m3/oz gold, compared to the previous year (9.9 m3/oz gold), due to lower ore quality. Meanwhile, the use of domestic water in office facilities and employee accommodation, which comes from groundwater wells, increased by 20.3%—from 24.6 ML in 2020 to 29.6 ML in 2021, in line with the increase in the number of employees and contractors.
Tujuh Bukit Gold Mine recycles domestic wastewater in water treatment facilities domestic waste, the proceeds of which are used for sprinkling non-mining road dust. The Tujuh Bukit Gold Mine also operates a cyanide solution treatment suite at the leaching facility. In 2021, water recycling for mineral ore leaching was 30.4% greater than in 2020, due to an increase in the volume of ore processed.