Members of South Africa's National Union of Mineworkers (NUM) and the Association of Mineworkers and Construction Union (AMCU), whose members have been on strike at Sibanye-Stillwater's gold operations since March 9, chant slogans outside the government Union Buildings in Pretoria, South Africa, May 23, 2022. REUTERS/Siphiwe Sibeko 

Members of South Africa's National Union of Mineworkers (NUM) and the Association of Mineworkers and Construction Union (AMCU), whose members have been on strike at Sibanye-Stillwater's gold operations since March 9, chant slogans outside the government Union Buildings in Pretoria, South Africa, May 23, 2022. REUTERS/Siphiwe Sibeko 

Members of South Africa's National Union of Mineworkers (NUM) and the Association of Mineworkers and Construction Union (AMCU), whose members have been on strike at Sibanye-Stillwater's gold operations since March 9, gather outside the government Union Buildings in Pretoria, South Africa, May 23, 2022. REUTERS/Siphiwe Sibeko 

Members of South Africa's National Union of Mineworkers (NUM) and the Association of Mineworkers and Construction Union (AMCU), whose members have been on strike at Sibanye-Stillwater's gold operations since March 9, chant slogans outside the government Union Buildings in Pretoria, South Africa, May 23, 2022. REUTERS/Siphiwe Sibeko 

Members of South Africa's National Union of Mineworkers (NUM) and the Association of Mineworkers and Construction Union (AMCU), whose members have been on strike at Sibanye-Stillwater's gold operations since March 9, hold placards as they chant slogans outside the government Union Buildings in Pretoria, South Africa, May 23, 2022. REUTERS/Siphiwe Sibeko 

Members of South Africa's National Union of Mineworkers (NUM) and the Association of Mineworkers and Construction Union (AMCU), whose members have been on strike at Sibanye-Stillwater's gold operations since March 9, leave after holding a mass meeting at the Driefontein mine, near Carletonville, in the southwest of Johannesburg, South Africa, April 22, 2022. REUTERS/Siphiwe Sibeko 

Members of South Africa's National Union of Mineworkers (NUM) and the Association of Mineworkers and Construction Union (AMCU), whose members have been on strike at Sibanye-Stillwater's gold operations since March 9, leave after holding a mass meeting at the Driefontein mine, near Carletonville, in the southwest of Johannesburg, South Africa, April 22, 2022. REUTERS/Siphiwe Sibeko 

Members of South Africa's National Union of Mineworkers (NUM) and the Association of Mineworkers and Construction Union (AMCU), whose members have been on strike at Sibanye-Stillwater's gold operations since March 9, chant slogans at the Driefontein mine, near Carletonville, in the southwest of Johannesburg, South Africa, April 22, 2022. REUTERS/Siphiwe Sibeko 

Members of South Africa's National Union of Mineworkers (NUM) and the Association of Mineworkers and Construction Union (AMCU), who have been on strike at Sibanye-Stillwater's gold operations since March 9, hold placards as they stage a protest outside the company's Kloof Mine, in the southwest of Johannesburg, South Africa, March 25, 2022. REUTERS/Siphiwe Sibeko 

Members of South Africa's National Union of Mineworkers (NUM) and the Association of Mineworkers and Construction Union (AMCU), who have been on strike at Sibanye-Stillwater's gold operations since March 9, hold placards as they stage a protest outside the company's Kloof Mine, in the southwest of Johannesburg, South Africa, March 25, 2022. REUTERS/Siphiwe Sibeko 

Association of Mineworkers and Construction Union (AMCU) president Joseph Mathunjwa addresses protesting workers, including South Africa's National Union of Mineworkers (NUM), who have been on strike at Sibanye-Stillwater's gold operations since March 9, during a protest outside the company's Kloof Mine, in the southwest of Johannesburg, South Africa, March 25, 2022. REUTERS/Siphiwe Sibeko 

Members of South Africa's National Union of Mineworkers (NUM) and the Association of Mineworkers and Construction Union (AMCU), who have been on strike at Sibanye-Stillwater's gold operations since March 9, hold placards as they stage a protest outside the company's Kloof Mine, in the southwest of Johannesburg, South Africa, March 25, 2022. REUTERS/Siphiwe Sibeko 

Members of South Africa's National Union of Mineworkers (NUM) and the Association of Mineworkers and Construction Union (AMCU), who have been on strike at Sibanye-Stillwater's gold operations since March 9, hold placards as they stage a protest outside the company's Kloof Mine, in the southwest of Johannesburg, South Africa, March 25, 2022. REUTERS/Siphiwe Sibeko 

A mine worker wears a protective face mask with a logo of South Africa's Association of Mineworkers and Construction Union (AMCU), ahead of his shift during a nationwide coronavirus disease (COVID-19) lockdown at the Sibanye Stillwater mine in Carletonville, South Africa, May 19, 2020. REUTERS/Siphiwe Sibeko 

A man who works as a miner holds coca leaves in La Rinconada, the Andes, Peru, October 5, 2019. REUTERS/Nacho Doce SEARCH "WOMEN GOLD PICKERS FEMICIDE" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES 

Members of South Africa's Association of Mineworkers and Construction Union (AMCU) chant slogans during a march to the Minerals Council of South Africa in Johannesburg, South Africa, January 22, 2019. REUTERS/Siphiwe Sibeko 

Members of South Africa's Association of Mineworkers and Construction Union (AMCU) chant slogans during a march to the Minerals Council of South Africa in Johannesburg, South Africa, January 22, 2019. REUTERS/Siphiwe Sibeko 

Members of South Africa's Association of Mineworkers and Construction Union (AMCU) chant slogans during a march to the Minerals Council of South Africa in Johannesburg, South Africa, January 22, 2019. REUTERS/Siphiwe Sibeko 

Members of South Africa's Association of Mineworkers and Construction Union (AMCU) chant slogans during a march to the Minerals Council of South Africa in Johannesburg, South Africa, January 22, 2019. REUTERS/Siphiwe Sibeko 

Asociation of Mineworkers and Construction Union (AMCU) president Joseph Mathunjwa addresses the striking workers during a march to the Minerals Council of South Africa in Johannesburg, South Africa, January 22, 2019. REUTERS/Siphiwe Sibeko 

Association of Mineworkers and Construction Union (AMCU) president Joseph Mathunjwa addresses striking workers during a march to the Minerals Council of South Africa in Johannesburg, South Africa, January 22, 2019. REUTERS/Siphiwe Sibeko 

Members of South Africa's Association of Mineworkers and Construction Union (AMCU) chant slogans during a march to the Minerals Council of South Africa in Johannesburg, South Africa January 22, 2019. REUTERS/Siphiwe Sibeko 

Members of South Africa's Association of Mineworkers and Construction Union (AMCU) chant slogans during a march to the Minerals Council of South Africa in Johannesburg, South Africa January 22, 2019. REUTERS/Siphiwe Sibeko 

Riot police stand guard outside the offices of Minerals Council of South Africa during a march of members of South Africa's Association of Mineworkers and Construction Union (AMCU) in Johannesburg, South Africa, January 22,2019. REUTERS/Siphiwe Sibeko 

Asociation of Mineworkers and Construction Union (AMCU) president Joseph Mathunjwa addresses striking workers during a march to the Minerals Council of South Africa in Johannesburg, South Africa, January 22, 2019. REUTERS/Siphiwe Sibeko 

Members of South Africa's Association of Mineworkers and Construction Union (AMCU) chant slogans during a march to the Minerals Council of South Africa in Johannesburg, South Africa, January 22, 2019. REUTERS/Siphiwe Sibeko 

Members of South Africa's Association of Mineworkers and Construction Union (AMCU) chant slogans during a march to the Minerals Council of South Africa in Johannesburg, South Africa, January 22, 2019. REUTERS/Siphiwe Sibeko 

A miner holds earth contain coltan in a coltan mine in Birambo, Masisi territory, North Kivu Province of Democratic Republic of Congo, December 1, 2018. REUTERS/Goran Tomasevic 

A miner shows coltan in Birambo, Masisi territory, North Kivu Province of Democratic Republic of Congo, December 1, 2018. REUTERS/Goran Tomasevic 

A miner takes part during a search for fellow miners missing after a landslide caused by Typhoon Mangkhut at a small-scale mining camp in Itogon, Benguet, Philippines September 17, 2018. REUTERS/Erik De Castro 

National Union of Mineworkers (NUM) official, Maurice Kent sits inside the Kellingley Social Club in Knottingley, Britain August 1, 2018. Picture taken August 1, 2018. REUTERS/Phil Noble 

Cables running into cryptocurrency miners are seen at the HydroMiner cryptocurrency farming operation near Waidhofen an der Ybbs, Austria April 25, 2018. REUTERS/Leonhard Foeger 

Cables running into cryptocurrency miners are seen at the HydroMiner cryptocurrency farming operation near Waidhofen an der Ybbs, Austria April 25, 2018. REUTERS/Leonhard Foeger 

Cables running into cryptocurrency miners are seen at the HydroMiner cryptocurrency farming operation near Waidhofen an der Ybbs, Austria April 25, 2018. REUTERS/Leonhard Foeger 

A miner uses a drill inside 'El Teniente' copper mine of Chile's state copper giant Codelco in Rancagua, Chile March 21, 2018. REUTERS/Ivan Alvarado 

A wildcat gold miner, or garimpeiro, uses high-pressure jets of water to dislodge rock material at a wildcat mine, also known as garimpo, at a deforested area of Amazon rainforest near Crepurizao, in the municipality of Itaituba, Para State, Brazil, August 2, 2017. REUTERS/Nacho Doce SEARCH "WILDCAT MINING" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. TPX IMAGES OF THE DAY 

Miners and members of the Association of Mineworkers and Construction Union (AMCU) sing as they carry spears and sticks during the 5th-year anniversary commemorations to mark the killings of 34 striking platinum miners shot dead by police outside the Lonmin's Marikana platinum mine in Rustenburg, 100 km (62 miles) northwest of Johannesburg, South Africa August 16, 2017.Reuters/Siphiwe Sibeko 

Miners and members of the Association of Mineworkers and Construction Union (AMCU) sing during the 5th-year anniversary commemorations to mark the killings of 34 striking platinum miners shot dead by police outside the Lonmin's Marikana platinum mine in Rustenburg, 100 km (62 miles) northwest of Johannesburg, South Africa August 16, 2017.Reuters/Siphiwe Sibeko 

Miners and members of the Association of Mineworkers and Construction Union (AMCU) sing during the 5th-year anniversary commemorations to mark the killings of 34 striking platinum miners shot dead by police outside the Lonmin's Marikana platinum mine in Rustenburg, 100 km (62 miles) northwest of Johannesburg, South Africa August 16, 2017.Reuters/Siphiwe Sibeko TPX IMAGES OF THE DAY 

Miners and members of the Association of Mineworkers and Construction Union (AMCU) sing during the 5th-year anniversary commemorations to mark the killings of 34 striking platinum miners shot dead by police outside the Lonmin's Marikana platinum mine in Rustenburg, 100 km (62 miles) northwest of Johannesburg, South Africa August 16, 2017.Reuters/Siphiwe Sibeko 

A miner and member of the Association of Mineworkers and Construction Union (AMCU) arrives for the 5th-year anniversary commemorations to mark the killings of 34 striking platinum miners shot dead by police outside the Lonmin's Marikana platinum mine in Rustenburg, 100 km (62 miles) northwest of Johannesburg, South Africa August 16, 2017. Reuters/Siphiwe Sibeko 

A miner and member of the Association of Mineworkers and Construction Union (AMCU) arrives for the 5th-year anniversary commemorations to mark the killings of 34 striking platinum miners shot dead by police outside the Lonmin's Marikana platinum mine in Rustenburg, 100 km (62 miles) northwest of Johannesburg, South Africa August 16, 2017. Reuters/Siphiwe Sibeko 

French President Francois Hollande (L) welcomes former coal miner Norbert Gilmez (R), who fought for the rehabilitation for the former strikers of the general coal miners strike in 1948, during a ceremony at the Elysee Palace in Paris, France, September 28, 2016. At 2ndL, former French Justice Minister Christiane Taubira, and two members of the family of late strikers in 1948 Francois Ribouillat (C) and Aimable Duhamel (R). REUTERS/Michel Euler/Pool 

French President Francois Hollande (L) hugs former coal miner Norbert Gilmez, who fought for the rehabilitation for the former strikers of the general coal miners strike in 1948, during a ceremony at the Elysee Palace in Paris, France, September 28, 2016. REUTERS/Michel Euler/Pool 

ATTENTION EDITORS - VISUALS COVERAGE OF SCENES OF DEATH OR INJURY Relatives and friends bring to the surface the body of a miner after recovering it from Johannesburg's oldest gold mine in Langlaagte, South Africa, September 13, 2016. REUTERS/Siphiwe Sibeko 

REFILE - CORRECTING GRAMMAR A suspected illegal miner (C) is questioned by police after he emerged from an underground Johannesburg's oldest gold mine in Langlaagte, South Africa September 12, 2016. REUTERS/Siphiwe Sibeko TPX IMAGES OF THE DAY

A miner is transported on a stretcher by rescue workers after he was rescued from below ground in Johannesburg's oldest gold mine in Langlaagte, South Africa, September 12, 2016. REUTERS/Siphiwe Sibeko 

A suspected illegal miner looks at the entrance of an underground Johannesburg's oldest gold mine in Langlaagte, South Africa September 12, 2016. REUTERS/Siphiwe Sibeko 

Suspected illegal miners walk after they surfaced from an underground Johannesburg's oldest gold mine in Langlaagte, South Africa September 12, 2016. REUTERS/Siphiwe Sibeko 

Suspected illegal miners look on after they surfaced from an underground Johannesburg's oldest gold mine in Langlaagte, South Africa September 12, 2016. REUTERS/Siphiwe Sibeko 

A suspected illegal miner (C) is welcomed by friends and family members as he surfaces from an underground Johannesburg's oldest gold mine in Langlaagte, South Africa September 12, 2016. REUTERS/Siphiwe Sibeko 

A police officer gestures to a suspected illegal miner after he surfaced from an underground Johannesburg's oldest gold mine in Langlaagte, South Africa September 12, 2016. REUTERS/Siphiwe Sibeko 

A suspected illegal miner (C) is questioned by police after he emerged from an underground Johannesburg's oldest gold mine in Langlaagte, South Africa September 12, 2016. REUTERS/Siphiwe Sibeko 

A suspected illegal miner (C) is questioned by police after he emerged from an underground Johannesburg's oldest gold mine in Langlaagte, South Africa September 12, 2016. REUTERS/Siphiwe Sibeko 

Bolivia's Minister of Government Carlos Romero (C) gives information about the death of Bolivian Deputy Interior Minister Rodolfo Illanes, who was kidnapped by striking mineworkers on August 25, at a national congress session, in La Paz, Bolivia, September 7, 2016. At right is mining minister Cesar Navarro and at left is senate president Luis Alberto Gonzales. REUTERS/David Mercado 

Bolivia's Minister of Government Carlos Romero (R) gives information about the death of Bolivian Deputy Interior Minister Rodolfo Illanes, who was kidnapped by striking mineworkers on August 25, at a national congress session, in La Paz, Bolivia, September 7, 2016. At left is mining minister Cesar Navarro. REUTERS/David Mercado 

Bolivia's Minister of Government Carlos Romero (L) gives information about the death of Bolivian Deputy Interior Minister Rodolfo Illanes, who was kidnapped by striking mineworkers on August 25, at a national congress session, in La Paz, Bolivia, September 7, 2016. REUTERS/David Mercado 

Bolivia's Minister of Government Carlos Romero (L) gives information about the death of Bolivian Deputy Interior Minister Rodolfo Illanes, who was kidnapped by striking mineworkers on August 25, at a national congress session, in La Paz, Bolivia, September 7, 2016. At right is mining minister Cesar Navarro. REUTERS/David Mercado 

A miner who works illegally at a gold concession owned by AngloGold Ashanti shows a shaft dug by hand in Obuasi, Ghana, July 7, 2016. Picture taken July 7, 2016. REUTERS/Matthew Mpoke Bigg

A miner who works illegally at a gold concession owned by AngloGold Ashanti shows a shaft dug by hand in Obuasi, Ghana, July 7, 2016. Picture taken July 7, 2016. REUTERS/Matthew Mpoke Bigg