Lode

Source: Wikipedia, the free encyclopedia.
Blue Ribbon Mine, Alaska

In

Late Middle English, which in turn is from the 11th-century meaning of lode as a "course, way".[2]

The generally accepted hydrothermal model of lode deposition posits that metals dissolved in hydrothermal solutions (hot spring fluids) deposit the gold or other metallic minerals inside the fissures in the pre-existing rocks.[3] Lode deposits are distinguished primarily from placer deposits, where the ore has been eroded out from its original depositional environment and redeposited by sedimentation.[4] A third process for ore deposition is as an evaporite.

A stringer lode is one in which the rock is so permeated by small veinlets that rather than mining the veins, the entire mass of ore and the enveined

anastomosis stringers, so that the ore is not separable from the country rock.[5]

One of the largest silver lodes was the Comstock Lode in Nevada,[6] although it is overshadowed by the more recently discovered Cannington Lode in Queensland, Australia.[7][8] The largest gold lode in the United States was the Homestake Lode.[9] The Broken Hill Lode in South Australia is the largest lead-zinc lode ever discovered.[10]

See also

Notes

  1. OCLC 29112728
    .
  2. ^ a b "lode". Oxford English Dictionary (Online ed.). Oxford University Press. (Subscription or participating institution membership required.)
  3. ^ Fournier, R.O. (1999). "Hydrothermal processes related to movement of fluid from plastic into brittle rock in the magmatic environment". Economic Geology and the Society of Economic Geologists. 18: 486–497.
  4. ^ McGregor, Tisha; et al. (2000). "Mining the Motherlode: Lode vs. Placer Mining". Wells, California: Wells Historical Society. Archived from the original on 29 May 2002.
  5. OCLC 7678360
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  6. .
  7. ^ Staff (2007). "Cannington Silver and Lead Mine, Queensland, Australia". Mining-technology.com of Net Resources International. Archived from the original on 31 December 2007.
  8. .
  9. ^ Yarrow, Andrew L. (9 August 1987). "Beneath South Dakota's Black Hills". The New York Times. Retrieved 2008-01-11. Homestake, which is the largest, deepest and most productive gold mine in North America, has yielded more than $1 billion in gold over the years.
  10. ^ Staff (February 2007). "Curnamona Geology". Department for Manufacturing, Innovation, Trade, Resources and Energy, Government of South Australia.
  11. ^ The New Oxford American Dictionary (NOAD), 3rd edition.


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