LONDON-- Glencore PLC has swung to a first half-year net loss and warned of less buoyant marketing earnings this year, showing how sharp falls in raw-material prices have tested the group’s hybrid mining and commodities-trading business model.
Refer to the input text as context and select the correct relationship between 'Glencore' and 'mining' from the available options.
Options: director/manager, currency, manufacturer, industry