Small investment silver bars lie arranged in a box in the Precious Metals Division of the Glogow smelter in southwestern Poland, owned by KGHM, the country's metallurgical giant, on March 24, 2026. (Photo by Wojtek RADWANSKI / AFP via Getty Images)

Workers smelt silver ingots known as "the pig sows" at the Precious Metals Division of the Glogow 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)

Workers smelt silver ingots known as "the pig sows" at the Precious Metals Division of the Glogow 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)

Piotr Krzyzewski, KGHM vice president in charge of finance, poses for a photo during an AFP interview at the headquarters of KGHM, the country's metallurgical giant, in Warsaw, on March 27, 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)

Workers smelt silver ingots known as "the pig sows" at the Precious Metals Division of the Glogow 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)

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)

Workers smelt silver ingots known as "the pig sows" at the Precious Metals Division of the Glogow 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)