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.
In the context of the input sentence, determine the relationship between 'Glencore' and 'Mining'.
Options: location of formation, industry, owned by, business division