Question · Q3 2025
John Tumazos asked if the delayed restart of the two mining zones beneath the mud rush incident (mid-2027/end of 2027) is due to a safety decision to wait for a 12-month seasonal precipitation cycle to ensure plugs and pumps work. He also asked if a cement plug would be put into the 300-meter mud column.
Answer
Mark Johnson (President and COO, Freeport-McMoRan Indonesia) clarified that the mid-2027 timing for PB1 South is primarily driven by chute gallery repairs, with surface mud mitigation techniques implemented during this period. PB1C's later restart is due to additional concerns, including the 300-meter mud column. He confirmed that 15-meter reinforced concrete plugs are being installed in drifts, designed to hold back the hydrostatic pressure of the mud column, and would need to be removed to mine PB1C. Kathleen Quirk (President and CEO) added that no production from PB1C is included in 2026 or 2027 numbers.
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