They're mining sulfur, which locals call devil's gold.

The sulfur is used in everything for matches and rubber to cosmetic products.

It's even what makes our sugar white while mining company pet john D.

Grimsby owns the license to run the mine.

The miners are freelance contractors, so they have to pay for their own gear and many can't afford gas masks.

This is how it works.

When the super hot smoke hits the cooler air outside it condenses liquid and drips off the pipe as it solidifies and cools the sulfur will turn yellow and miners can begin chipping off blocks.

Miners like missed our carry up to £200 of sulfur on their backs up and down these steep cliffs.

Once he reaches the rim of the crater, the star can transfer the sulfur to his trolley and begin the two miles back.