Miners use heavy machines to work more than 1,000 meters underground at the PolkowiceSieroszowice copper and silver mine in southwestern Poland, owned by KGHM, the country's metallurgical giant, 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)

General view of the main gate of the Gogów copper smelter in southwestern Poland, owned by KGHM, the metallurgical giant in the country, on March 24, 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)

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)

99.99 percent pure copper plates, each weighing more than a hundred kilos, are stored in a warehouse before shipment, at the smelter in Glogow in southwestern Poland, owned by KGHM the metallurgical giant in the country, 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)