APPLICATIONS OF TEXTURAL CHARACTERISTICS TO ORE DRESSING
GEOMETRIC CLASSIFICATION OF ORE MINERAL TEXTURES AND THEIR LIBERATION CHARACTERISTICS
Texture/Interlocking: Equigranular, straight, rectilinear, cuspate margins. Simple locking (Fig 1).Liberation Properties: Fairly easy liberation. Common occurrence especially in orthomagmatic and highly metamorphosed and recrystallized ores. Also in ores showing successive depositional sequence.
Texture/Interlocking: Mutually curving boundaries with negligible interpenetration. Simple locking (Fig 2).
Liberation Properties: Fairly easy liberation. Common occurrence in simultaneously crystallized ores where interfacial free energies are similar.
Texture/Interlocking: Mottled, spotty, careous, with partial penetration. Relatively simple locking (Fig 3).
Liberation Properties: Fairly easy liberation. Common occurrence in ores where interreplacement processes have been active.
Texture/Interlocking: Graphic, myrmekitic, visceral locking. Deep micropenetration (Fig 4).
Liberation Properties: Complete liberation difficult or impossible. Not common as a major texture in ores. Produced by exsolution and replacement. Eg. Galena/sphalerite and chalcocite/bornite.
Texture/Interlocking: Disseminated, drop like, emulsion, eutectoidal locking. Finely dispersed phases (Fig 5)
Liberation Properties: Complete liberation difficult or impossible; chemical treatment often required. Common occurrence by exsolution (left) Au/arsenopyrite, chalcopyrite/sphalerite; by replacement (right) pyrite/sphalerite.
Texture/Interlocking: Intergranular rim; coating mantled, enveloped, atoll-like locking (Fig 6).
Liberation Properties: Liberation may be difficult if free grain is continuously enveloped by layer. Not uncommon, often formed by replacement reaction. Eg. Hematite film on gold; chalcocite or covellite on pyrite, galena or sphalerite.
Texture/Interlocking: Concentric, spherulitic, scalloped, colloform-layered locking (Fig 7).
Liberation Properties: Liberation fairly difficult or difficult; common occurrence in Fe, Mn, and Al ores. Also U (pitchblende) intergrained with sulfide. Usually associated with colloidal precipitation.
Texture/Interlocking: Planar, lamellar, sandwich-type locking. Lamellae may vary in size (Fig 8).
Liberation Properties: Liberation fairly easy to variable. Produced by exsolution (Eg. Cubanite/chalcopyrite, ilmenite/magnetite). Also by replacement (Eg. Magnetite and hematite).
Texture/Interlocking: Reticulate (net-like) boxwork. Finely interpenetrating locking (Fig 9).
Liberation Properties: Liberation variable to difficult. Common occurrence by replacement (Eg. bornite/chalcopyrite, anglesite/covellite/galena). Also by exsolution (Eg. hematite/ilmenite/magnetite).
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