A surname from Norwegian.

plural of Orness

plural of copper ore

plural of iron ore

plural of sulfur ore

plural of feather ore

plural of pea ore

plural of gold-copper ore

Any treatment of an ore used to concentrate its valuable constituents (minerals) into products (concentrate) of smaller bulk, and simultaneously to collect the worthless material (gangue) into discardable waste (tailings).

any ore containing elemental sulfur, or a sulfide from which it may be obtained