Refer to the input text as context and select the correct relationship between 'Pebble Mine' and 'gold' from the available options.
Options: product/material produced, distribution format, chief executive officer, founded by

Before going to Kotzebue, Obama went to Dillingham, home to one of the world's largest sockeye salmon fisheries, where residents are fighting the Pebble Mine copper and gold project that has been proposed by Northern Dynasty Minerals Ltd .
product/material produced