Refer to the input text as context and select the correct relationship between 'Turquoise Hill Resources' and 'gold' from the available options.
Options: distribution format, employer, product/material produced, member of

July 15 (Reuters) - A project financing agreement for the underground expansion of Oyu Tolgoi, a massive copper and gold mine in Mongolia, is expected to be signed by year end, mine owner Rio Tinto (LSE: RIO.L - news ) 's Turquoise Hill Resources (Toronto: IVN.TO - news ) unit said on Wednesday.
product/material produced