Analyze the relationship between 'Glencore' and 'Mining' within the context of the input sentence.
Options: industry, manufacturer, product/material produced, stock exchange

Mining stocks were mostly lower as risk appetite waned, with heavyweights BHP Billiton (NYSE: BBL - news ) , Glencore (Xetra: A1JAGV - news ) and Anglo American (LSE: AAL.L - news ) all registering falls.
industry