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  2. Mother lode - Wikipedia

    en.wikipedia.org/wiki/Mother_lode

    The zone contains hundreds of mines and prospects, including some of the best-known historic mines of the gold-rush era. Individual gold deposits within the Mother Lode are gold-bearing quartz veins up to 15 metres (49 ft) thick and a few thousand feet long. The California Mother Lode was one of the most productive gold-producing districts in ...

  3. Vein (geology) - Wikipedia

    en.wikipedia.org/wiki/Vein_(geology)

    In situ gold-bearing vein (in brown) at the Toi gold mine, Japan. In many gold mines exploited during the gold rushes of the 19th century, vein material alone was typically sought as ore material. [8] In most of today's mines, ore material is primarily composed of the veins and some component of the wall rocks which surrounds the veins. [9]

  4. Quartz reef mining - Wikipedia

    en.wikipedia.org/wiki/Quartz_reef_mining

    Quartz reef breaking the surface at Paynes Find, Western Australia. Quartz reef mining is a type of gold mining in "reefs" (veins [1]) of quartz.Quartz is one of the most common minerals in the Earth's crust, and most quartz veins do not carry gold, but those that have gold are avidly hunted by prospectors.

  5. Comstock Lode - Wikipedia

    en.wikipedia.org/wiki/Comstock_Lode

    In the spring of 1859, after digging down to a depth of about ten feet, they found a gold-rich reddish quartz vein. Their discovery was actually part of the Comstock Lode, the Old Red Ledge. [ 2 ] : 5–6 The four men are therefore credited with the rediscovery of the mine previously found by the Grosh brothers.

  6. Epithermal vein deposit - Wikipedia

    en.wikipedia.org/wiki/Epithermal_vein_deposit

    The Guanajuato Mining District, Mexico: This district has been mined for centuries and is known for its high-grade epithermal veins containing gold and silver. [11] The Baguio Mineral District, Philippines: This district is home to numerous epithermal vein deposits, including the Acupan Mine, one of the largest gold mines in the Philippines. [12]

  7. Ore genesis - Wikipedia

    en.wikipedia.org/wiki/Ore_genesis

    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. Specimen is 3.2 cm (1.3 in) wide. Various theories of ore genesis explain how the various types of mineral deposits form within Earth's crust .

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  9. St. Genevieve marble - Wikipedia

    en.wikipedia.org/wiki/St._Genevieve_marble

    St. Genevieve Gold Vein" is light or medium gray in color, with veins (running from buff to tan in color) running through it. [3] Cross-sections of corals and crinoids can be seen in the Gold Vein type. [3] [2] In the 1910s, it was widely considered the best "marble" found in the U.S. and known for its strength.

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