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 .
Analyze the relationship between 'Pebble Mine' and 'gold' within the context of the input sentence.
Options: product/material produced, founded by, distribution format, chief executive officer