Linked from
The 8 pages that link to Gangue, each with the reason it gives.
Iron oreRelated: Silica and other gangue minerals affect processing costs and product quality.
Ore depositRelated: Gangue dilutes valuable minerals and affects separation costs.
SmeltingRelated: Smelting separates metal-bearing material from gangue by forming slag.
Ore dressingRelated: Dressing aims to reject gangue while retaining valuable mineral grains.
Stamp millRelated: Stamping liberates valuable grains from the gangue that surrounds them.