Mining stocks trimmed earlier losses but still finished lower with heavyweights BHP Billiton (NYSE: BBL - news ) , Glencore (Xetra: A1JAGV - news ) and Anglo American (LSE: AAL.L - news ) ending in the red.
In the context of the input sentence, determine the relationship between 'Glencore' and 'Mining'.
Options: industry, manufacturer, subsidiary, chief executive officer