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  2. Orogenic gold deposit - Wikipedia

    en.wikipedia.org/wiki/Orogenic_gold_deposit

    A variety of gold deposits are formed in accretionary orogens, including orogenic gold deposits. [38] Orogenic gold deposits are typically located in metamorphosed fore-arc and back-arc regions, as well as in the arc [3] and show a close spatial relationship to lamprophyres and associated felsic porphyry dikes and sills. [39]

  3. Ore genesis - Wikipedia

    en.wikipedia.org/wiki/Ore_genesis

    The majority of primary gold deposits fall into two main categories: lode gold deposits or intrusion-related deposits. Lode gold deposits, also referred to as orogenic gold are generally high-grade, thin, vein and fault hosted. They are primarily made up of quartz veins also known as lodes or reefs, which contain either native gold or gold ...

  4. List of orogenies - Wikipedia

    en.wikipedia.org/wiki/List_of_orogenies

    Appalachian Mountains are a well-studied orogenic belt resulting from a late Paleozoic collision between North America and Africa. Taconic orogeny – Mountain-building period that affected most of New England; Acadian orogeny – North American orogeny; Alleghanian orogeny – Mountain-forming event that formed the Appalachian and Allegheny ...

  5. Central Asian Orogenic Belt - Wikipedia

    en.wikipedia.org/wiki/Central_Asian_Orogenic_Belt

    The Laoshankou Iron Oxide-Cu-Au deposit, which is located at the southwest of the Qinhe City, Xinjian, Northwest China, is considered as one of the most important high-quality copper and gold reserve in the Central Asian Orogenic Belt, with the deposit being hosted by the volcanic rocks formed during Middle Devonian. [30]

  6. Homestake Mine (South Dakota) - Wikipedia

    en.wikipedia.org/wiki/Homestake_Mine_(South_Dakota)

    By 1975, mining operations had reached the 6,800-foot (2,073 m) level, and two winzes were planned to 8,000 feet (2,438 m). [7]: 63–66, 73–74 Homestake high-grade gold ore, view is about 1.2 cm wide. The gold ore mined at Homestake was considered low grade (less than one ounce per ton), but the body of ore was large. [8]

  7. Ore shoot - Wikipedia

    en.wikipedia.org/wiki/Ore_shoot

    Gold Ore Vein Located in Good Enough Silver Mine in Tombstone, Arizona. In gold vein deposits the ore shoots tend to be deposited in an elongated plunging direction. The majority of the time the ore shoot plunge for orogenic gold deposits arises from the mineral deposition and direction of the fluid flow controlled by structures. [4]

  8. Yavapai orogeny - Wikipedia

    en.wikipedia.org/wiki/Yavapai_orogeny

    Precambrian provinces of western North America, showing the Yavapai Province (in dark grey) The Yavapai orogeny was an orogenic (mountain-building) event in what is now the Southwestern United States that occurred between 1710 and 1680 million years ago (), [1] in the Statherian Period of the Paleoproterozoic.

  9. North China Craton - Wikipedia

    en.wikipedia.org/wiki/North_China_Craton

    Gold (Au) deposits in the Mesozoic are very abundant. [ 52 ] [ 61 ] The formation environment of the gold includes intercontinental mineralization, craton destruction and mantle replacement. [ 52 ] The origin of the gold is from Precambrian basement rocks of the Jiaodong Complex and underlying mantle which underwent high grade metamorphism when ...