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