A driver looks on behind the wheel of a mining vehicle used to transport miners 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)

A worker monitors the electrochemical process of extracting pure copper at a 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)

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)

Aerial view of the St. James Shaft 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)

Aerial view of the St. James Shaft 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)

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)

Miners walk down together for 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)

A miner assists in unloading copper ore above a conveyor belt more than 1,000 meters underground in the PolkowiceSieroszowice copper and silver mine in southwestern Poland, owned by the KGHM conglomerate, a metallurgical powerhouse 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)