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Ore genesis
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Various theories of ore genesis explain how the various types of mineral deposits form within Earth's crust. Ore-genesis theories vary depending on the mineral or commodity examined.
High-grade gold ore from the Harvard Mine, Jamestown, California, a wide quartz-gold vein in California's Mother Lode. Specimen is 3.2 cm (1.3 in) wid
High-grade gold ore from the Harvard Mine, Jamestown, California, a wide quartz-gold vein in California's Mother Lode. Specimen is 3.2 cm (1.3 in) wide.
High-grade (bonanza) gold ore, brecciated quartz-adularia rhyolite. Field of view ~10.5 cm across. Native gold (Au) occurs in this rock as colloform b
High-grade (bonanza) gold ore, brecciated quartz-adularia rhyolite. Field of view ~10.5 cm across. Native gold (Au) occurs in this rock as colloform bands, partially replaces breccia clasts, and is also disseminated in the matrix. Published research indicates that Sleeper Mine rocks represent an ancient epithermal gold deposit (hot springs gold deposit), formed by volcanism during Basin & Range extensional tectonics. Sleeper Gold Mine, Humboldt County, Nevada.
Citrobacter species can have concentrations of uranium in their bodies 300 times higher than in the surrounding environment.
Citrobacter species can have concentrations of uranium in their bodies 300 times higher than in the surrounding environment.
Tunicates such as this bluebell tunicate contain vanadium as vanabin.
Tunicates such as this bluebell tunicate contain vanadium as vanabin.
Ore
Videos
Ore is natural rock or sediment that contains one or more valuable minerals, typically including metals, concentrated above background levels, and that is economically viable to mine and process. Ore
Ore genesis
…Various theories of ore genesis explain how the various types of mineral deposits form within Earth's crust. Ore-genesis theories vary depending on the mineral or commodity examined. Ore-genesis theories generally involve three…
Manganese ore – psilomelane (size: 6.7 × 5.8 × 5.1 cm)
Manganese ore – psilomelane (size: 6.7 × 5.8 × 5.1 cm)
Lead ore – galena and anglesite (size: 4.8 × 4.0 × 3.0 cm)
Lead ore – galena and anglesite (size: 4.8 × 4.0 × 3.0 cm)
Granitic pegmatite composed of plagioclase and K-feldspar, large hornblende crystal present. Scale bar is 5.0 cm
Granitic pegmatite composed of plagioclase and K-feldspar, large hornblende crystal present. Scale bar is 5.0 cm
Piece of kimberlite. 11.1 cm x 4.5 cm
Piece of kimberlite. 11.1 cm x 4.5 cm