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A report from the University of Cambridge's Minderoo Centre said the apps were a "gold mine" for consumer profiling and collecting information.

The 39-year-old's body was among those discovered in the disused gold mine in January.

Some of his most striking pictures were taken in his home country, including epic photos of thousands of desperate figures working in open-cast gold mines and striking images of the indigenous people of the Amazon.

The most shocking thing for Jonathan, who had endured six gruelling months living and working underground in an abandoned South African gold mine, was the abuse he witnessed being meted out to children.

Police in Colombia have arrested the alleged main suspect in the murder of 13 kidnapped workers at a gold mine in neighbouring Peru.