Deep in the Amazon rainforest, sex is traded for gold dug straight from the earth. The lives of women here are shaped by the illegal gold mines known as 'garimpos' and the brothels that spring up alongside them. For some, they are a source of survival, for others a source of suffering. With unprecedented, intimate access, BBC 100 Women travelled to the Brazilian Amazon to reveal the hidden lives of three women caught in this dangerous web, risking the violence of the mines for their dream of a better future.