Costa Rica's former president and 1987 Nobel Peace Laureate Oscar Arias, speaks to the media before attending a court hearing after the Public Prosecutor's Office accused him of an illegally authorised concession for the Canada-based Infinito Gold to operate an open-pit gold mine known as Crucitas, in San Jose, Costa Rica September 17, 2019. REUTERS/Juan Carlos Ulate 

Costa Rica's former president and 1987 Nobel Peace Laureate Oscar Arias, speaks to the media before attending a court hearing after the Public Prosecutor's Office accused him of an illegally authorised concession for the Canada-based Infinito Gold to operate an open-pit gold mine known as Crucitas, in San Jose, Costa Rica September 17, 2019. REUTERS/Juan Carlos Ulate 

Costa Rica's former president and 1987 Nobel Peace Laureate Oscar Arias, and his lawyer Rodolfo Brenes leave after attending a court hearing, after the Public Prosecutor's Office accused him of an illegally authorised concession for the Canada-based Infinito Gold to operate an open-pit gold mine known as Crucitas, in San Jose, Costa Rica September 17, 2019. REUTERS/Juan Carlos Ulate 

Costa Rica's former president and 1987 Nobel Peace Laureate Oscar Arias, and his lawyer Rodolfo Brenes walks after attending a court hearing, after the Public Prosecutor's Office accused him of an illegally authorised concession for the Canada-based Infinito Gold to operate an open-pit gold mine known as Crucitas, in San Jose, Costa Rica September 17, 2019. REUTERS/Juan Carlos Ulate 

Costa Rica's former president and 1987 Nobel Peace Laureate Oscar Arias, arrives to attend a court hearing after the Public Prosecutor's Office accused him of an illegally authorised concession for the Canada-based Infinito Gold to operate an open-pit gold mine known as Crucitas, in San Jose, Costa Rica September 17, 2019. REUTERS/Juan Carlos Ulate 

Costa Rica's former president and 1987 Nobel Peace Laureate Oscar Arias, speaks to the media after attending a court hearing, after the Public Prosecutor's Office accused him of an illegally authorised concession for the Canada-based Infinito Gold to operate an open-pit gold mine known as Crucitas, in San Jose, Costa Rica September 17, 2019. REUTERS/Juan Carlos Ulate 

Costa Rica's former president and 1987 Nobel Peace Laureate Oscar Arias, speaks to the media after attending a court hearing, after the Public Prosecutor's Office accused him of an illegally authorised concession for the Canada-based Infinito Gold to operate an open-pit gold mine known as Crucitas, in San Jose, Costa Rica September 17, 2019. REUTERS/Juan Carlos Ulate 

Costa Rica's former president and 1987 Nobel Peace Laureate Oscar Arias, speaks to the media after attending a court hearing, after the Public Prosecutor's Office accused him of an illegally authorised concession for the Canada-based Infinito Gold to operate an open-pit gold mine known as Crucitas, in San Jose, Costa Rica September 17, 2019. REUTERS/Juan Carlos Ulate 

Costa Rica's former president and 1987 Nobel Peace Laureate Oscar Arias, speaks to the media before attending a court hearing after the Public Prosecutor's Office accused him of an illegally authorised concession for the Canada-based Infinito Gold to operate an open-pit gold mine known as Crucitas, in San Jose, Costa Rica September 17, 2019. REUTERS/Juan Carlos Ulate 

Costa Rica's former president and 1987 Nobel Peace Laureate Oscar Arias, arrives with his lawyer Rodolfo Brenes to attend a court hearing after the Public Prosecutor's Office accused him of an illegally authorised concession for the Canada-based Infinito Gold to operate an open-pit gold mine known as Crucitas, in San Jose, Costa Rica September 17, 2019. REUTERS/Juan Carlos Ulate 

A general view PT Timah's open pit mine in Pemali, Bangka island, Indonesia, July 25, 2019. REUTERS/Fransiska Nangoy 

An excavator loads soil onto a truck at PT Timah's open pit mine in Pemali, Bangka island, Indonesia, July 25, 2019. REUTERS/Fransiska Nangoy 

Environmental activists demonstrate inside a pit of Garzweiler open cast brown coal mine during a protest against the climate change near Duesseldorf, Germany June 22, 2019. REUTERS/Thilo Schmuelgen 

Environmental activists sit inside a pit of Garzweiler open cast brown coal mine during a protest against the climate change near Duesseldorf, Germany June 22, 2019. REUTERS/Thilo Schmuelgen 

Environmental activists demonstrate inside a pit of Garzweiler open cast brown coal mine during a protest against the climate change near Duesseldorf, Germany June 22, 2019. REUTERS/Thilo Schmuelgen 

Police officers are seen inside a pit of Garzweiler open cast brown coal mine during a protest against the climate change near Duesseldorf, Germany June 22, 2019. REUTERS/Thilo Schmuelgen 

Environmental activists demonstrate inside a pit of Garzweiler open cast brown coal mine during a protest against the climate change near Duesseldorf, Germany June 22, 2019. REUTERS/Thilo Schmuelgen 

Police officers stand inside a pit of Garzweiler open cast brown coal mine during a protest against the climate change near Duesseldorf, Germany June 22, 2019. REUTERS/Thilo Schmuelgen 

Police officers stand inside a pit of Garzweiler open cast brown coal mine during a protest against the climate change near Duesseldorf, Germany June 22, 2019. REUTERS/Thilo Schmuelgen 

Police officers stand next to environmental activists inside a pit of Garzweiler open cast brown coal mine during a protest against the climate change near Duesseldorf, Germany June 22, 2019. REUTERS/Thilo Schmuelgen 

Police officers stand inside a pit of Garzweiler open cast brown coal mine during a protest against the climate change near Duesseldorf, Germany June 22, 2019. REUTERS/Thilo Schmuelgen 

Police officers are seen inside a pit of Garzweiler open cast brown coal mine during a protest against the climate change near Duesseldorf, Germany June 22, 2019. REUTERS/Thilo Schmuelgen 

Environmental activists sit inside a pit of Garzweiler open cast brown coal mine during a protest against the climate change near Duesseldorf, Germany June 22, 2019. REUTERS/Thilo Schmuelgen 

Environmental activists sit inside a pit of Garzweiler open cast brown coal mine during a protest against the climate change near Duesseldorf, Germany June 22, 2019. REUTERS/Thilo Schmuelgen 

Environmental activists protest inside a pit of Garzweiler open cast brown coal mine during a protest against the climate change near Duesseldorf, Germany June 22, 2019. REUTERS/Thilo Schmuelgen 

Police officers detain an environmental activist inside a pit of Garzweiler open cast brown coal mine during a protest against the climate change near Duesseldorf, Germany June 22, 2019. REUTERS/Thilo Schmuelgen 

Environmental activists sit inside a pit of Garzweiler open cast brown coal mine during a protest against the climate change near Duesseldorf, Germany June 22, 2019. REUTERS/Thilo Schmuelgen 

Environmental activists sit inside a pit of Garzweiler open cast brown coal mine during a protest against the climate change near Duesseldorf, Germany June 22, 2019. REUTERS/Thilo Schmuelgen 

Environmental activists sit inside a pit of Garzweiler open cast brown coal mine during a protest against the climate change near Duesseldorf, Germany June 22, 2019. REUTERS/Thilo Schmuelgen 

Environmental activists sit inside a pit of Garzweiler open cast brown coal mine during a protest against the climate change near Duesseldorf, Germany June 22, 2019. REUTERS/Thilo Schmuelgen 

Environmental activists sit inside a pit of Garzweiler open cast brown coal mine during a protest against the climate change near Duesseldorf, Germany June 22, 2019. REUTERS/Thilo Schmuelgen 

Environmental activists sit inside a pit of Garzweiler open cast brown coal mine during a protest against the climate change near Duesseldorf, Germany June 22, 2019. REUTERS/Thilo Schmuelgen TPX IMAGES OF THE DAY 

Environmental activists enter a pit of Garzweiler open cast brown coal mine during a protest against the climate change near Duesseldorf, Germany June 22, 2019. REUTERS/Thilo Schmuelgen 

Environmental activists are seen inside a pit of Garzweiler open cast brown coal mine during a protest against the climate change near Duesseldorf, Germany June 22, 2019. REUTERS/Thilo Schmuelgen 

Police officers block environmental activists as they gather near a pit of Garzweiler open cast brown coal mine during a protest against the climate change near Duesseldorf, Germany June 22, 2019. REUTERS/Thilo Schmuelgen 

Police officers block environmental activists as they gather near a pit of Garzweiler open cast brown coal mine during a protest against the climate change near Duesseldorf, Germany June 22, 2019. REUTERS/Thilo Schmuelgen 

Environmental activists walk through a field near a pit of Garzweiler open cast brown coal mine during a protest against the climate change near Duesseldorf, Germany June 22, 2019. REUTERS/Thilo Schmuelgen 

Police officers block environmental activists as they gather near a pit of Garzweiler open cast brown coal mine during a protest against the climate change near Duesseldorf, Germany June 22, 2019. REUTERS/Thilo Schmuelgen 

A police officer blocks environmental activists walking near a pit of Garzweiler open cast brown coal mine during a protest against the climate change near Duesseldorf, Germany June 22, 2019. REUTERS/Thilo Schmuelgen 

Environmental activists walk amid the red smoke from flares during a protest against the climate change near a pit of Garzweiler open cast brown coal mine near Duesseldorf, Germany June 22, 2019. REUTERS/Thilo Schmuelgen 

Environmental activists walk near a pit of Garzweiler open cast brown coal mine during a protest against the climate change near Duesseldorf, Germany June 22, 2019. REUTERS/Thilo Schmuelgen 

Environmental activists gather near a pit of Garzweiler open cast brown coal mine during a protest against the climate change near Duesseldorf, Germany June 22, 2019. REUTERS/Thilo Schmuelgen 

Police officers on horses is seen as environmental activists walk through a field near a pit of Garzweiler open cast brown coal mine during a protest against the climate change near Duesseldorf, Germany June 22, 2019. REUTERS/Thilo Schmuelgen 

Environmental activists walk through a field near a pit of Garzweiler open cast brown coal mine during a protest against the climate change near Duesseldorf, Germany June 22, 2019. REUTERS/Thilo Schmuelgen 

Environmental activists walk through a field near a pit of Garzweiler open cast brown coal mine during a protest against the climate change near Duesseldorf, Germany June 22, 2019. REUTERS/Thilo Schmuelgen 

Environmental activists walk through a field near a pit of Garzweiler open cast brown coal mine during a protest against the climate change near Duesseldorf, Germany June 22, 2019. REUTERS/Thilo Schmuelgen 

Environmental activists gather near a pit of Garzweiler open cast brown coal mine during a protest against the climate change near Duesseldorf, Germany June 22, 2019. REUTERS/Thilo Schmuelgen 

Police officers block environmental activists as they gather near a pit of Garzweiler open cast brown coal mine during a protest against the climate change near Duesseldorf, Germany June 22, 2019. REUTERS/Thilo Schmuelgen 

Environmental activists gather near a pit of Garzweiler open cast brown coal mine during a protest against the climate change near Duesseldorf, Germany June 22, 2019. REUTERS/Thilo Schmuelgen 

Environmental activists gather near a pit of Garzweiler open cast brown coal mine during a protest against the climate change near Duesseldorf, Germany June 22, 2019. REUTERS/Thilo Schmuelgen 

Chilean copper giant Codelco is overhauling its giant open-pit "Chuqui" mine and taking it underground, amid a major wider revamp. The move will see output at the mine - set to be Codelco's biggest this year - tumble 40% by 2021. embed code and instructions: https://reut.rs/2YK6BS8 

Police remove an activist from a tree as they try to clear the area at the "Hambacher Forst" in Hambach near Cologne, Germany, September 5, 2018, where protesters have built a camp with tents and treehouses to stop the clearing of a forest for open pit mining. REUTERS/Thilo Schmuelgen 

An activist climbs on a tree at the "Hambacher Forst" in Hambach near Cologne, Germany, September 5, 2018, where protesters have built a camp with tents and treehouses to stop the clearing of a forest for open pit mining. REUTERS/Thilo Schmuelgen 

Police secure the area at the "Hambacher Forst" in Hambach near Cologne, Germany, September 5, 2018, where protesters have built a camp with tents and treehouses to stop the clearing of a forest for open pit mining. REUTERS/Thilo Schmuelgen 

An activist climbs on a tree at the "Hambacher Forst" in Hambach near Cologne, Germany, September 5, 2018, where protesters have built a camp with tents and treehouses to stop the clearing of a forest for open pit mining. REUTERS/Thilo Schmuelgen 

Police remove an activist from a tree as they try to clear the area at the "Hambacher Forst" in Hambach near Cologne, Germany, September 5, 2018, where protesters have built a camp with tents and treehouses to stop the clearing of a forest for open pit mining. REUTERS/Thilo Schmuelgen 

Police remove an activist from a tree as they try to clear the area at the "Hambacher Forst" in Hambach near Cologne, Germany, September 5, 2018, where protesters have built a camp with tents and treehouses to stop the clearing of a forest for open pit mining. REUTERS/Thilo Schmuelgen 

A masked activist talks to journalists at the "Hambacher Forst" in Hambach near Cologne, Germany, September 5, 2018, where protesters have built a camp with treehouses to stop the clearing of a forest for open pit mining. REUTERS/Thilo Schmuelgen 

A masked activist talks to journalists at the "Hambacher Forst" in Hambach near Cologne, Germany, September 5, 2018, where protesters have built a camp with treehouses to stop the clearing of a forest for open pit mining. REUTERS/Thilo Schmuelgen 

A masked activist talks to journalists at the "Hambacher Forst" in Hambach near Cologne, Germany, September 5, 2018, where protesters have built a camp with treehouses to stop the clearing of a forest for open pit mining. REUTERS/Thilo Schmuelgen