A miner works on securing the mine vault with rock bolts more than 1,000 meters underground at the PolkowiceSieroszowice copper and silver mine in southwestern Poland, owned by KGHM, the metallurgical giant in the country, on March 25, 2026. Thousands of meters beneath the ground, amid suffocating heat, lies one of the keys to Poland's rumbling mining sector -- and the world economy. (Photo by Wojtek RADWANSKI / AFP via Getty Images)

Mining lamps charge in the lamp room at the PolkowiceSieroszowice copper and silver mine in southwestern Poland, owned by KGHM, the country's metallurgical giant. Thousands of meters beneath the ground, amid suffocating heat, lies one of the keys to Poland's rumbling mining sector -- and the world economy. (Photo by Wojtek RADWANSKI / AFP via Getty Images)

Miners get into the elevator to get back to the surface after their shift more than 1,000 meters underground at the PolkowiceSieroszowice copper and silver mine in southwestern Poland, owned by KGHM, the metallurgical giant in the country, on March 25, 2026. Thousands of meters beneath the ground, amid suffocating heat, lies one of the keys to Poland's rumbling mining sector -- and the world economy. (Photo by Wojtek RADWANSKI / AFP via Getty Images)

Smelter workers process copper at the Glogow plant in southwestern Poland, owned by KGHM, the country's metallurgical giant, on March 24, 2026. (Photo by Wojtek RADWANSKI / AFP via Getty Images)

A miner works on securing the mine vault with rock bolts more than 1,000 meters underground at the PolkowiceSieroszowice copper and silver mine in southwestern Poland, owned by KGHM, the metallurgical giant in the country, on March 25, 2026. Thousands of meters beneath the ground, amid suffocating heat, lies one of the keys to Poland's rumbling mining sector -- and the world economy. (Photo by Wojtek RADWANSKI / AFP via Getty Images)

Smelter workers process copper at the Glogow plant in southwestern Poland, owned by KGHM, the country's metallurgical giant, on March 24, 2026. (Photo by Wojtek RADWANSKI / AFP via Getty Images)

Smelter workers process copper at the Glogow plant in southwestern Poland, owned by KGHM, the country's metallurgical giant, on March 24, 2026. (Photo by Wojtek RADWANSKI / AFP via Getty Images)

Mining lamps charge in the lamp room at the PolkowiceSieroszowice copper and silver mine in southwestern Poland, owned by KGHM, the country's metallurgical giant. Thousands of meters beneath the ground, amid suffocating heat, lies one of the keys to Poland's rumbling mining sector -- and the world economy. (Photo by Wojtek RADWANSKI / AFP via Getty Images)