Commodities trader and mining giant Glencore PLC GLEN, -29.42% GLCNF, -27.70% sank 29% after Investec analysts suggested in a report that the company’s equity value could evaporate against its large debt pile unless commodity prices improve or the company launches a substantial restructuring.
Take context from the input text and decide on the accurate relationship between 'Glencore' and 'mining' from the options provided.
Options: member of, operator, brand, industry