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

The layoffs come as the company is implementing a roughly 50 per cent drop in mining, stacking and crushing rates at the mine, in which Freeport owns a 51 per cent stake and Chilean state-owned copper giant Codelco has the remaining 49 per cent interest.
product/material produced