• Geology Metamorphism Homework Flashcards | Quizlet

    Start studying Geology Metamorphism Homework. Learn vocabulary, terms, and more with flashcards, games, and other study tools. ... By what process did the gabbro turn into amphibolite? hot mantle rock rising from deep within the Earth. What is a mantle plum? ... Which type of metamorphism may precipitate economically important metallic deposits ...

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    ELSEVIER Ore Geology Reviews 9 (1994) 183-208 ORE GEOLOGY REVIEVS Metamorphic and structural setting of Archaean amphibolite- hosted gold deposits near Southern Cross, Southern Cross Province, Yilgarn Block, Western Australia Erik J.M. Bloem*, Hilko J. Dalstra, David I. Groves, John R. Ridley Key Centre for Strategic Mineral Deposits, Department of Geology and Geophysics, University …

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    Aug 12, 2013· Gold was discovered in central Montana on the east flank of the North Moccasin Mountains as well as in the Judith Mountains in the 1890s. Gold was identified in argillaceous layers in the Madison Limestone and the precious metal was not free milling, thus it was recovered by fine grinding and dissolving the metal with cyanide.

  • Amphibolite: Metamorphic Rock - Pictures, Definition & More

    Amphibolite: Amphibolite is a coarse-grained metamorphic rock that has amphibole minerals such as the hornblende group as its primary ingredient. The specimen shown is about two inches (five centimeters) across.

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    Gold deposits in high grade metamorphic terrains, and review of metamorphic effects and constraints on origins of gold-only deposits ... Kfeldspar-rich host packages in upper amphibolite-granulite ...

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    GOLD IN METAMORPHIC ROCKS: FACTS AND FANCY Fig. 1 – A possible, fractal-like, classification of mineral deposits, in which the shear zone related ores have a symmetrical position to the "intermediate" ore deposits, such as porphyry coppers or massive sulfide deposits (acc. to Uduba¿a et al., 1998).

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    "Gunnison District" is a occurrence vein deposit district in the Rocky Mountain System of Colorado, The United States. It is a small deposit, located in the Gunnison District mining district and is considered to be of world-class significance. 1 Gold and zinc deposits are documented at "Gunnison District."

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  • Gold in Metamorphic rocks: Facts and Fancy

    GOLD IN METAMORPHIC ROCKS: FACTS AND FANCY Fig. 1 – A possible, fractal-like, classification of mineral deposits, in which the shear zone related ores have a symmetrical position to the "intermediate" ore deposits, such as porphyry coppers or massive sulfide …

  • Amphibolite facies gold mineralization: an exemple from ...

    Amphibolite facies gold mineralization: an exemple from the Roberto deposit, Eleonore property, James Bay, Quebec. Thèse. Québec, Université du Québec, Institut national de la recherche scientifique, Doctorat en sciences de la terre, 325 p.

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    A significant proportion of gold production from the Archean Yilgarn craton in Western Australia has come from lode- and vein-style deposits hosted in amphibolite and granulite facies metamorphic rocks rather than in greenschist facies terranes, which are the normal hosts of such deposits in …

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    A quartz vein included within the Mary Ellen stock carries visible gold, and a quartz stringer within sheared metaleucodacite porphyry dike contained disseminated arsenopyrite, and showed 0.01 oz/ton gold along with 0.01 oz/ton silver. South Pass greenstone belt …

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  • Geo - Chapter 8 Flashcards | Quizlet

    Amphibolite is a foliated metamorphic rock composed principally of hornblende and plagioclase. How does it form? By regional metamorphism of volcanic rocks such as andesite and basalt

  • Amphibolite - Wikipedia

    Amphibolite (/ æ m ˈ f ɪ b ə l aɪ t /) is a metamorphic rock that contains amphibole, especially the species hornblende and actinolite, as well as plagioclase.. Amphibolite is a grouping of rocks composed mainly of amphibole and plagioclase feldspar, with little or no quartz.It is typically dark-colored and dense, with a weakly foliated or schistose (flaky) structure.

  • Prospecting for Gold - The GOLD HUNTER

    There are many other types of structurally and chemically controlled ore shoots. For example, while prospecting in the Gold Hill district in the Medicine Bow Mountains of Wyoming, I noted that gold was almost exclusively found in veins adjacent to amphibolite. Veins in quartzite were unproductive.

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    Gold grains vary in diameter from > 5 μm to 1 mm (mainly 25–200 μm). Gold fineness ranges from 778 to 896 (mean 821: Fan et al. 2013), which is lower than the gold fineness of > 900 that typifies most Archean amphibolite-facies gold deposits (Morrison et al. 1991; Knight et al. 1993). The ore minerals at the Danba deposit can be described ...

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  • Amphibole | Minerals Education Coalition

    Amphibole. Amphibolite is a dark, heavy, metamorphic rock composed mostly of the mineral amphibole. Amphibolites have very little to no quartz. "Amphibole" refers not to a single mineral, but to a group of minerals. Most belong to the monoclinic crystal …

  • Geochemistry of hydrothermal gold deposits: A review ...

    Similar fluid evolution and gold precipitation mechanism have been described in the Tianger region of China's Tianshan Mountains (Zhu et al., 2007b). Three stages have been identified in the Tianger gold deposits. Stage I occurs at a depth of 10 km under conditions of the amphibolite facies.

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    Keywords: amphibolite, rare earth elements, tectonic evolution, Ifewara, Ife-Ilesha schist belt 1. Introduction The amphibolites of Ifewara in the Ife-Ilesha schist belt (Figure 1) in southwestern Nigeria constitute a major rock unit within the amphibolite complex, with which placer gold and disseminated sulphide mineralization have

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    However, being an atypical gold deposit, the key geological parameters involved in its genesis need to be identified in order to understand its formation and define exploration criteria that will help discover similar gold deposits in the James Bay territory and elsewhere in amphibolite-grade terranes of the Superior Province.

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    Gold was initially found by Spanish prospectors along the Colorado River between 1775 and 1780, but it was the later discovery of the precious metal at Sutter's Mill in 1848 that produced one of the most important events in the history of the western US and led to a major gold rush that enveloped California with thousands of prospectors and merchants swarming to the Californian gold fields ...

  • (PDF) Yilgarn Star gold deposit, Southern Cross greenstone ...

    PDF | On Jan 1, 2001, W.K. Witt and others published Yilgarn Star gold deposit, Southern Cross greenstone belt, Western Australia: geological setting and characteristics of an amphibolite-facies ...

  • Gascoyne's 'trapped continent' turns up unusual gold deposit

    Jul 29, 2015· The Nalunaq Gold Mine contains hanging wall rocks (pictured) which are Paleoproterozoic amphibolite-facies metadolerites. Credit: James St. John ...