Surely, 10 oz per ton of dirt use for an estimated resource would be a big lie if you cannot prove it !.
This irresponsible claim, at worst could turn the Tres Estados area into an environmental disaster from illegal gold mining as per Mega 13 in the Madre de Dios region:
https://www.usatoday.com/story/news...ld-mines-devaste-amazon-rain-forest/98917084/
http://edition.cnn.com/2017/11/10/w...ir-peru-amazon-illegal-gold-mining/index.html
https://www.theguardian.com/global-...-of-massacre-among-amazon-tribe-javari-valley