A view shows a non-operating smelting shop in the town of Nikel in Murmansk Region, Russia February 26, 2021. The smelter, which was the oldest production facility of Russian miner Norilsk Nickel, was closed in 2020 as part of the company's environmental programme aiming to reduce hazardous emissions into the atmosphere. REUTERS/Evgenia Novozhenina

A view shows the logo of Norilsk Nickel company at a non-operating smelting shop in the town of Nikel in Murmansk Region, Russia February 26, 2021. The smelter, which was the oldest production facility of Russian miner Norilsk Nickel, was closed in 2020 as part of the company's environmental programme aiming to reduce hazardous emissions into the atmosphere. REUTERS/Evgenia Novozhenina

A view shows a non-operating smelting shop in the town of Nikel in Murmansk Region, Russia February 26, 2021. The smelter, which was the oldest production facility of Russian miner Norilsk Nickel, was closed in 2020 as part of the company's environmental programme aiming to reduce hazardous emissions into the atmosphere. REUTERS/Evgenia Novozhenina

A view shows a non-operating smelting shop in the town of Nikel in Murmansk Region, Russia February 26, 2021. The smelter, which was the oldest production facility of Russian miner Norilsk Nickel, was closed as part of the company's environmental programme aiming to reduce hazardous emissions into the atmosphere. REUTERS/Evgenia Novozhenina

A view shows a non-operating smelting shop in the town of Nikel in Murmansk Region, Russia February 26, 2021. The smelter, which was the oldest production facility of Russian miner Norilsk Nickel, was closed as part of the company's environmental programme aiming to reduce hazardous emissions into the atmosphere. REUTERS/Evgenia Novozhenina

An interior view shows a non-operating smelting shop in the town of Nikel in Murmansk Region, Russia February 26, 2021. The smelter, which was the oldest production facility of Russian miner Norilsk Nickel, was closed as part of the company's environmental programme aiming to reduce hazardous emissions into the atmosphere. REUTERS/Evgenia Novozhenina

An employee shows a large gem-quality diamond named by Russian miner Alrosa after Sputnik-V, a vaccine against the coronavirus disease (COVID-19), in Moscow, Russia February 25, 2021. Picture taken February 25, 2021. REUTERS/Tatyana Makeyeva

An employee shows a large gem-quality diamond named by Russian miner Alrosa after Sputnik-V, a vaccine against the coronavirus disease (COVID-19), in Moscow, Russia February 25, 2021. Picture taken February 25, 2021. REUTERS/Tatyana Makeyeva

An employee shows a large gem-quality diamond named by Russian miner Alrosa after Sputnik-V, a vaccine against the coronavirus disease (COVID-19), in Moscow, Russia February 25, 2021. Picture taken February 25, 2021. REUTERS/Tatyana Makeyeva

Rodney Roberts fills a bucket with water from his swimming pool to fill toilets in his house after winter weather caused water outages in Mineral Wells, Texas, U.S. February 20, 2021. REUTERS/Cooper Neill TPX IMAGES OF THE DAY

Rodney Roberts carries buckets with water from his swimming pool inside to fill toilets in his house after winter weather caused water outages in Mineral Wells, Texas, U.S. February 20, 2021. REUTERS/Cooper Neill

Rodney Roberts tests the faucet in his house after winter weather caused water outages in Mineral Wells, Texas, U.S. February 20, 2021. REUTERS/Cooper Neill

Graphic shows the area of the explosion at the Hushan Gold Mine and from where the miners were rescued after clearing the blockage in the main shaft.

A total of 22 workers were trapped underground in the Hushan gold mine on the outskirts of Yantai, on China’s eastern coast, following the January 10 blast

FILE PHOTO: Jars containing rare earth minerals produced by Australia's Lynas Corp from its Mount Weld operations are seen near Laverton, northeast of Perth, Australia, August 23, 2019. REUTERS/Melanie Burton/File Photo

Mineral is seen in a mine in the village of Veovaca near Vares, Bosnia and Herzegovina, October 28, 2020. Picture taken October 28, 2020. REUTERS/Dado Ruvic

People gather as they carry a coffin of a coal miner from Shi'ite Hazara minority, who along with others got killed in an attack in Mach area of Bolan district, during a funeral in Quetta, Pakistan January 9, 2021. REUTERS/Naseer Ahmed

Women mourn the death of a relative who was a coal miner from Shi'ite Hazara minority, and got killed along with others in an attack in Mach area of Bolan district, during a funeral in Quetta, Pakistan January 9, 2021. REUTERS/Naseer Ahmed

People gather as they carry the coffins of coal miners from Shi'ite Hazara minority, who were killed in an attack in Mach area of Bolan district, during a funeral in Quetta, Pakistan January 9, 2021. REUTERS/Naseer Ahmed

People raise their hands as they chant slogans during a funeral of coal miners from Shi'ite Hazara minority, who were killed in an attack in Mach area of Bolan district, in Quetta, Pakistan January 9, 2021. REUTERS/Naseer Ahmed

People chant slogans during a funeral of coal miners from Shi'ite Hazara minority, who were killed in an attack in Mach area of Bolan district, in Quetta, Pakistan January 9, 2021. REUTERS/Naseer Ahmed

A woman mourns the death of a relative who was a coal miner from Shi'ite Hazara minority, and got killed along with others in an attack in Mach area of Bolan district, during a funeral in Quetta, Pakistan January 9, 2021. REUTERS/Naseer Ahmed

People gather as they carry a coffin of a coal miner from Shi'ite Hazara minority, who along with others got killed in an attack in Mach area of Bolan district, during a funeral in Quetta, Pakistan January 9, 2021. REUTERS/Naseer Ahmed

People gather near the coffins of coal miners from Shi'ite Hazara minority, who were killed in an attack in Mach area of Bolan district, during a funeral in Quetta, Pakistan January 9, 2021. REUTERS/Naseer Ahmed

People chant slogans demanding justice, following the killings of coal miners from Shi'ite Hazara minority in an attack in Mach area of Bolan district, during a sit-in protest along a road in Karachi, Pakistan January 8, 2021. REUTERS/Akhtar Soomro

People chant slogans as they sit with coffins of their relatives, coal miners from Shi'ite Hazara minority, who were killed in an attack in Mach area of Bolan district, as they protest demanding justice in Quetta, Pakistan January 7, 2021. REUTERS/Naseer Ahmed

People chant slogans demanding justice, following the killings of coal miners from Shi'ite Hazara minority in an attack in Mach area of Bolan district, during a sit-in protest along a road in Karachi, Pakistan January 7, 2021. REUTERS/Akhtar Soomro

A police vehicle is parked on a road covered with stones thrown by protesters following the killings of coal miners from Pakistan's Shi'ite Hazara minority in an attack in the Mach area of Bolan district, in Karachi, Pakistan January 7, 2021. REUTERS/Akhtar Soomro

People hold placards demanding justice, following the killings of coal miners from Pakistan's Shi'ite Hazara minority in an attack in the Mach area of Bolan district, during a sit in protest in Karachi, Pakistan January 7, 2021. REUTERS/Akhtar Soomro

People offer prayers beside a tent with the bodies of coal miners from Pakistan's minority Shi'ite Hazara community, who were killed in Mach area of Bolan district, as they protest demanding justice, in Quetta, Pakistan January 5, 2021. REUTERS/Naseer Ahmed

People carry placards demanding justice, following the killings of coal miners from Pakistan's minority Shi'ite Hazara community in an attack in Mach area of Bolan district, during a protest in Karachi, Pakistan January 5, 2021. REUTERS/Akhtar Soomro

A woman carries a placard demanding justice, following the killings of coal miners from Pakistan's minority Shi'ite Hazara community in an attack in Mach area of Bolan district, during a protest in Karachi, Pakistan January 5, 2021. REUTERS/Akhtar Soomro

People chant slogans as they carry placards demanding justice, following the killings of coal miners from Pakistan's minority Shi'ite Hazara community in an attack in Mach area of Bolan district, during a protest in Karachi, Pakistan January 5, 2021. REUTERS/Akhtar Soomro

People carry placards demanding justice, following the killings of coal miners from Pakistan's minority Shi'ite Hazara community in an attack in Mach area of Bolan district, during a protest in Karachi, Pakistan January 5, 2021. REUTERS/Akhtar Soomro

People mourn their relatives, who were coal miners from Pakistan's minority Shi'ite Hazara community killed in an attack in Mach area of Bolan district, as they protest demanding justice, in Quetta, Pakistan January 4, 2021. REUTERS/Naseer Ahmed

People gather near the coffins of their relatives, who were coal miners from Pakistan's minority Shi'ite Hazara community killed in an attack in Mach area of Bolan district, as they protest demanding justice, in Quetta, Pakistan January 4, 2021. REUTERS/Naseer Ahmed

People and family members carry a body of their relative, who was a coal miner and got killed along with other coworkers from Pakistan's minority Shi'ite Hazara community by unidentifyed persons in Mach area of Bolan district, in Quetta, Pakistan January 3, 2021. REUTERS/Naseer Ahmed

People and family members gather to identify the bodies of their relatives, who were coal miners from Pakistan's minority Shi'ite Hazara community and got killed by unidentifyed persons in Mach area of Bolan district, in Quetta, Pakistan January 3, 2021. REUTERS/Naseer Ahmed

Thai gold miner Sunisa Srisuwanno poses for a picture with gold pan and basin at Sukhirin, Thailand December 29, 2020. Picture taken December 29, 2020. REUTERS/Matthew Tostevin

Thai gold miners Boonsom Aeamprasert (L) and Sunisa Srisuwanno pan for gold on the Sai Buri river, Sukhirin, Thailand December 29, 2020. Picture taken December 29, 2020. REUTERS/Matthew Tostevin

Thai gold miner pans for gold on the Sai Buri river, Sukhirin, Thailand December 28, 2020. Picture taken December 28, 2020. REUTERS/Matthew Tostevin

Thai gold miners Boonsom Aeamprasert (L) and Sunisa Srisuwanno pan for gold on the Sai Buri river, Sukhirin, Thailand December 29, 2020. Picture taken December 29, 2020. REUTERS/Matthew Tostevin

Thai gold miners Boonsom Aeamprasert (L) and Sunisa Srisuwanno pan for gold on the Sai Buri river, Sukhirin, Thailand December 29, 2020. Picture taken December 29, 2020. REUTERS/Matthew Tostevin

Thai gold miner Sunisa Srisuwanno holds up gold worth 3,000 baht ($100) from the Sai Buri river at Sukhirin, Thailand December 29, 2020. Picture taken December 29, 2020. REUTERS/Matthew Tostevin

Thai gold miner finds grains of gold in his pan on the Sai Buri river at Sukhirin, Thailand December 28, 2020. Picture taken December 28, 2020. REUTERS/Matthew Tostevin

Thai gold miner Sunisa Srisuwanno pans for gold on the Sai Buri river, Sukhirin, Thailand December 29, 2020. Picture taken December 29, 2020. REUTERS/Matthew Tostevin

Thai gold miner in snorkel mask searches for place to dig for gold-bearing mud on the Sai Buri river at Sukhirin, Thailand December 28, 2020. Picture taken December 28, 2020. REUTERS/Matthew Tostevin

For more than 300 "ice miners" in Harbin, work begins in the numbing cold before dawn every day on the frozen Songhua, a broad river that winds its way through the northeastern Chinese city. Wielding long ice picks, the workers break up the frozen surface of the kilometre-wide river into crate-sized blocks of ice. Many of them construction labourers or farmers, they wear knee-high rubber boots, down jackets, thick gloves and hats with flaps to protect their ears from the frigid air. REUTERS/Carlos Garcia Rawlins TPX IMAGES OF THE DAY SEARCH "HARBIN RAWLINS" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES

For more than 300 "ice miners" in Harbin, work begins in the numbing cold before dawn every day on the frozen Songhua, a broad river that winds its way through the northeastern Chinese city. Wielding long ice picks, the workers break up the frozen surface of the kilometre-wide river into crate-sized blocks of ice. Many of them construction labourers or farmers, they wear knee-high rubber boots, down jackets, thick gloves and hats with flaps to protect their ears from the frigid air. REUTERS/Carlos Garcia Rawlins TPX IMAGES OF THE DAY SEARCH "HARBIN RAWLINS" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES

Nurse Venus Lucero administers the first Pfizer-BioNTech COVID-19 vaccine at the Civic Hospital to Jo-Anne Miner at a vaccination clinic in Ottawa, Ontario, Canada December 15, 2020. Adrian Wyld/Pool via REUTERS

A projection on the building of the National Congress with drawings of the Yanomami xapiri, the spirits of the Forest, is seen during a protest to evict illegal gold miners from Brazil's largest indigenous Yanomami reservation in the Amazon to help stop the spread of the coronavirus disease (COVID-19), in Brasilia, Brazil December 3, 2020. REUTERS/Adriano Machado

A projection on the building of the National Congress with drawings of the Yanomami xapiri, the spirits of the Forest, is seen during a protest to evict illegal gold miners from Brazil's largest indigenous Yanomami reservation in the Amazon to help stop the spread of the coronavirus disease (COVID-19), in Brasilia, Brazil December 3, 2020. REUTERS/Adriano Machado

A projection on the building of the National Congress with drawings of the Yanomami xapiri, the spirits of the Forest, is seen during a protest to evict illegal gold miners from Brazil's largest indigenous Yanomami reservation in the Amazon to help stop the spread of the coronavirus disease (COVID-19), in Brasilia, Brazil December 3, 2020. REUTERS/Adriano Machado

A projection on the building of the National Congress with drawings of the Yanomami xapiri, the spirits of the Forest, is seen during a protest to evict illegal gold miners from Brazil's largest indigenous Yanomami reservation in the Amazon to help stop the spread of the coronavirus disease (COVID-19), in Brasilia, Brazil December 3, 2020. REUTERS/Adriano Machado

A projection on the building of the National Congress with drawings of the Yanomami xapiri, the spirits of the Forest, is seen during a protest to evict illegal gold miners from Brazil's largest indigenous Yanomami reservation in the Amazon to help stop the spread of the coronavirus disease (COVID-19), in Brasilia, Brazil December 3, 2020. REUTERS/Adriano Machado

A projection on the building of the National Congress with drawings of the Yanomami xapiri, the spirits of the Forest, is seen during a protest to evict illegal gold miners from Brazil's largest indigenous Yanomami reservation in the Amazon to help stop the spread of the coronavirus disease (COVID-19), in Brasilia, Brazil December 3, 2020. REUTERS/Adriano Machado

A projection on the building of the National Congress with drawings of the Yanomami xapiri, the spirits of the Forest, is seen during a protest to evict illegal gold miners from Brazil's largest indigenous Yanomami reservation in the Amazon to help stop the spread of the coronavirus disease (COVID-19), in Brasilia, Brazil December 3, 2020. REUTERS/Adriano Machado

A projection on the building of the National Congress with drawings of the Yanomami xapiri, the spirits of the Forest, is seen during a protest to evict illegal gold miners from Brazil's largest indigenous Yanomami reservation in the Amazon to help stop the spread of the coronavirus disease (COVID-19), in Brasilia, Brazil December 3, 2020. REUTERS/Adriano Machado