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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]
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.
Supíkovice marble (supíkovický mramor) from Supíkovice, Jeseník District: grey-white; Marble mis-nomers: Cetechovice marble (cetechovický mramor) from Cetechovice, Kroměříž District: coloured [c] Karlík marble (karlický mramor), from Barrandien, Karlík, Prague-West District: black with gold-yellow-colour veins [d]
Pure white marble is the result of metamorphism of a very pure (silicate-poor) limestone or dolomite protolith. The characteristic swirls and veins of many colored marble varieties, sometimes called striations , are usually due to various mineral impurities such as clay , silt , sand , iron oxides , or chert which were originally present as ...
Besides placer deposits of gold, and gold bearing quartz in weathered rock, gold also occurs in quartz veins. The most profitable veins, in the Dahlonega District, occur in the contact zone between mica-schists and granite or diorite. [2]: 59–61 The discovery of gold in the Georgia Gold Belt in 1828 led to the Georgia Gold Rush.
It occurs in hydrothermal veins with tourmaline-bearing copper veins associated with granite, in some high temperature gold veins, and in recent volcanic exhalation deposits. Associated minerals include native bismuth, aikinite, arsenopyrite, stannite, galena, pyrite, chalcopyrite, tourmaline, wolframite, cassiterite and quartz. [2]
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