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.
Take context from the input text and decide on the accurate relationship between 'Glencore' and 'mining' from the options provided.
Options: currency, manufacturer, industry, director/manager