but the alphonsos now invite scrutiny from conservationists.sist they are sustainable miners. you don't have to plant no forest. you don't have to plant nothing. if i show you up there, that we clean it like here and now you go there, you can pass through the bush. yeah, but hang on a minute. this is a huge scar on the landscape. and also you use mercury, right, at the end of this process? yes. and what happens to all the mercury, which is poisonous? no, it doesn't mark, it doesn't show. we use everything inside here. contain it. from sifting the dirt to final smelting, this 6oz bar of gold represents a week's work forjust one mining crew. it's a payday of 12,000 us dollars. so this is pretty much pure gold? pure gold. guyana's gold rush has meant deforestation, and it has left, at least for a while, ugly scars. but now guyana is preoccupied with a very different kind of resource windfall — oil and gas. and that promises to be transformational. almost 200km off the coast, they found a fossil fuel reserve that will yield 11 billion barrels of oi