Refer to the input text as context and select the correct relationship between 'Codelco' and 'copper' from the available options.
Options: headquarters location, product/material produced, owned by, position held

We reached an agreement earlier this month with Codelco to repay $7.3 million due to them in respect of negative trade settlement adjustments, which were caused by the sharp drop in copper price in Q1.
product/material produced