Glencore (GLEN.L) slumped more than 15 percent to a new all-time low after a bearish note from broker Investec that raised doubts over the mining and commodities company's valuation and high debt levels.
Refer to the input text as context and select the correct relationship between 'Glencore' and 'mining' from the available options.
Options: stock exchange, industry, owned by, parent organization