Deep in the Amazon rainforest, Brazil is fighting destructive wildcat gold mining as it spreads from Indigenous lands into government-protected conservation areas.

Federal Police have joined the government’s biodiversity conservation agency ICMBio on a series of recent operations to catch illegal gold miners and destroy their camps and equipment.

Gold mining is a small but growing contributor to the cutting down of the Amazon rainforest, reducing its ability to suck up greenhouse gas.

Leftist President Luiz Inacio Lula da Silva’s government has already been cracking down on mining on Indigenous reservations.

But that has pushed some miners to other forests where there has been little enforcement.

This month, armed officers of ICMBio, a government agency named after murdered environmental activist Chico Mendes, swooped down in helicopters on wildcat camps in the upper reaches of the Tapajos, a tributary of the Amazon River.

They set fire to barges used to pump and filter ore, destroyed excavators and chainsaws, and seized weapons, radios and scales used by miners to weigh their gold.

Lula has vowed to stamp out illegal mining and end deforestation by 2030. That is a sharp reversal of policy from his predecessor Jair Bolsonaro, who was criticized globally for relaxing environmental controls, giving illegal loggers and miners free range in the Amazon. He argued that Brazil had the right to develop its natural resources.

On one recent mission, a Reuters photographer followed an ICMBio team into the Urupadi National Forest where agents detained a handful of wildcat miners and destroyed their tents, excavators, dredging equipment and fuel supplies.

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The miners had cut down swathes of jungle and dug dozens of ponds to dredge for gold that they separated from sand and ore with mercury, a contaminant that poisons fish in the rivers.

Through the open door of their incoming helicopter, the ICMBio agents fired automatic weapons at motor boats carrying flee