Mining stocks were under the cosh, with Anglo American (LSE: AAL.L - news ) , Glencore (Amsterdam: GX8.AS - news ) , BHP Billiton (NYSE: BBL - news ) and Antofagasta (Other OTC: ANFGF - news ) all firmly lower as metals prices fell across the board, with the exception of tin and nickel.
Analyze the relationship between 'Glencore' and 'Mining' within the context of the input sentence.
Options: developer, headquarters location, industry, parent organization