What is the relationship between 'Codelco' and 'copper' in the context of the input sentence.
Options: owner of, product/material produced, 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