Mining stocks were mostly lower, with heavyweights BHP Billiton (NYSE: BBL - news ) , Anglo American (LSE: AAL.L - news ) , Rio Tinto (LSE: RIO.L - news ) and Glencore (Xetra: A1JAGV - news ) all trading lower, as metal prices dipped across the board and copper suffered in particular.
Utilize the input text as a context reference, choose the right relationship between 'Glencore' and 'Mining' from the options.
Options: industry, business division, owned by, location of formation