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

SANTIAGO, Sept 28 The world's No.1 copper producer Codelco said on Monday that it was reducing the number of executives on its payroll by 15.6 percent, as the Chilean state-owned miner cuts costs in the face of tumbling prices for the industrial metal.
product/material produced