Take context from the input text and decide on the accurate relationship between 'gold mine' and 'gold' from the options provided.
Options: member of, location of formation, legal form, product/material produced

The mine began production in 2013, and is the only primary gold mine in the world with annual production of more than one million ounces of gold (100% basis), at all-in sustaining costs below $700 per ounce.
product/material produced