Utilize the input text as a context reference, choose the right relationship between 'Codelco' and 'copper' from the options.
Options: position held, member of, product/material produced, publisher

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