Mining Placer mining: Placers are unconsolidated deposits of detrital material containing valuable minerals. The natural processes by which they form range from chemical weathering to stream, marine, and wind action. Typical minerals recovered in placers are gold, tin, platinum, diamonds, titaniferous and ferrous iron sands, .
This is when solid particles stick to one another, and while this is an undesirable feature in many powder and particle processing operations, it is essential for the successful sintering of iron ore fines, coke and fluxes into a suitable blast furnace feed.
A rareearth element (REE) or rareearth metal (REM), as defined by IUPAC, is one of a set of seventeen chemical elements in the periodic table, specifically the fifteen lanthanides, as well as scandium and yttrium. Scandium and yttrium are considered rareearth elements because they tend to occur in the same ore deposits as the .
Types and varieties. The principal types of natural graphite, each occurring in different types of ore deposits are: . Crystalline small flakes of graphite (or flake graphite) occurs as isolated, flat, platelike particles with hexagonal edges if unbroken. When broken the edges can be irregular or angular;