(PDF) Greisen-related scheelite, gold and sulphide …
Free gold with arsenopyrite and pyrite occur at and base-metal sulphides in sheeted and stockwork Kirwans Hili in veins lateral to the scheelite-bear- quartz veins emplaced within metasediments (Kiring systems and at the intersection of NNW and wans Hili), and greisenised granite intrusive sheets (Bateman Creek). ENE trending fractures.
Timing and origin of skarn-, greisen-, and vein-hosted …
Tin mineralization occurs in skarns, greisen, and in cassiterite-bearing uorite-quartz veins. Skarn alteration replaces marble layers of the Cambrian Jáchymov Group and occurs in two clearly distinct stages.
TOMRA XRT Technology Enhances Saloro's Tungsten Mine
TOMRA has installed a first X-Ray Transmission (XRT) sorter at Saloro's tungsten mine in Barruecopardo, Spain. The sorter, implemented in the beneficiation stage, is consistently delivering a much higher head grade to the processing plant, significantly reducing costs.
Fluid inclusion and isotopic (C, H, O, S and Pb) constraints on …
It has long been recognized that W mineralization are mainly hosted in hydrothermal quartz veins or metasomatized roof zones (greisen), which either occur …
Crystallization processes and genesis of scheelite in a quartz …
The scheelite samples analyzed in this study were collected from the underground mining tunnels along Line 105 at an elevation of +480 m and + 390 m above sea level (Fig. 3b). ... Toutianmen (greisen type), and Dashan (quartz scheelite vein type). However, precise mineralization ages of these deposits remain poorly constrained and …
Structure, alteration, and geochemistry of the Charlotte quartz …
The opened fractures filled with barren quartz and scheelite during the retrograde stage (300 °C) of the hydrothermal event. ... They are filled with quartz–carbonate veins containing scheelite, pyrite, and minor chalcopyrite, pyrrhotite, sphalerite, and galena. ... (1995) Sm-Nd systematics of hydrothermal scheelite from the …
Texture and geochemistry of multi-stage hydrothermal scheelite …
Scheelite is a major Wbearing mineral extensively developed in several types of W deposits including the skarn-type, greisen-type, and quartz vein-type (Cerny and Ercit, 2005;Brugger et al., 2008 ...
Mineralogy, fluid inclusion and isotope signatures: …
The homogenization temperatures and salinities of fluid inclusions within scheelite are comparable to those in quartz from greisen and quartz veins stages, …
Contrasting coeval paragenesis of gold and scheelite in an …
A study of fluid inclusions in mineralized quartz and scheelite veins produced an average homogenization temperature of 195±45ºC. ... and geochronological data, combined with the quartz ...
Barruecopardo Tungsten Project, Castilla y Leon, Spain
Tungsten mineralisation is found in quartz veins mostly in the form of coarse grained scheelites less than 10cm in thickness. Intense veining at the deposit is nearly 40m wide. ... The Barruecopardo mine was operational until the 1980s, when mining activities ceased due to unsafe and uneconomic conditions. These mining …
Mineralisation at the Carrock Fell Tungsten Mine, N. England
Tungsten ore at Carrock Fell Mine comprises wolframite and scheelite in polyminerallic quartz veins which traverse the Grainsgill Granite cupola and surrounding country rocks. In the veins, a wolframite-scheelite-apatite assemblage pre-dates a scheelite-arsenopyrite-pyrite (plus other sulphides) assemblages. Temperatures of mineralisation declined from …
Fluid inclusion and stable isotope evidence for the genesis of quartz …
Abstract Scheelite mineralization accompanied by muscovite and albite, and traces of Mo-stolzite and stolzite occurs in epigenetic quartz vein systems hosted by two-mica gneissic schists, and locally amphibolites, of the Paleozoic or older Vertiskos Formation, in the Metaggitsi area, central Chalkidiki, N Greece. Three types of primary …
Textural and chemical types of scheelite at Golden Point, Macraes Mine
Golden Point at Macraes Mine in Otago contains W-Au-bearing hydrothermal quartz veins that have historically been mined. Scheelite is distributed through veins and has precipitated as one of four ...
Magmatic-hydrothermal transition of Mo-W-mineralized
The Knöttel granite stock is located in a historical mining district near the towns of Krupka and ... monazite, barite, scheelite, oxides of Nb, Ta and REE minerals: 0.1–3 mm ... 20% of the whole pegmatite body. The K-feldspar pegmatite was cross-cut by cm- to m-wide aplite dykes, microquartzite (greisen) and quartz veins, and it is often ...
Barruecopardo Mine, Barruecopardo, Salamanca, Castile …
Barruecopardo Mine, Barruecopardo, Salamanca, Castile and Leon, Spain : A tungsten mine, started in 1910. Scheelite-bearing veins and stockworks in greisenized granite.
[PDF] Vein and greisen Sn and W deposits | Semantic Scholar
Greisen deposits consist of disseminated cassiterite and cassiterite-bearing veinlets, stockworks, lenses, pipes, and breccia (fig. 3) in gangue composed of quartz, mica, fluorite, and topaz. Veins and greisen deposits are found within or near highly evolved, rare-metal enriched plutonic rocks, especially near contacts with surrounding …
Chapter 9 Greisen Systems
The term greisen refers to an assemblage of quartz + muscovite, accompanied by varying amounts of other distinctive minerals such as fluorite, topaz and tourma ... scheelite, arsenopyrite, molybdenite etc.). Mineral assemblages generated during greisen alteration of granitic rocks are listed in Table 9.1.
quartz scheelite veins and greisen at the barruecopardo mine
which contains scheelite-bearing greisen zones and small amounts of disseminated scheelite. Ore bodies pinch and swell. The scheelite-bearing rock is more micaceous …
Tailored solution helped to reopen Barruecopardo tungsten mine
The Barruecopardo mine is a tungsten open-pit mine with a current mine life of 10 years. After that, the mine could transition to an underground Stage 2. The mine's objective is to process one-and-a-half million tons of ore per year with 80-82% recovery of the mineral content, says Saloro's Jesús Martin, Director of the site.
Geology of the Zhuxi W skarn deposit and its surroundings
This type of garnet has disseminated fine-grained scheelite (commonly < 1 mm) and is cut by garnet + quartz + fluorite veins with coarse-grained (up to 1 cm) scheelite. Hydrothermal alteration of the massive skarn formed fluorite + clinopyroxene assemblages with disseminated scheelite (C4; Fig. A2 d).
Mineralogy, Fluid Inclusions, and Oxygen Isotope …
variability of the geological context in which scheelite occurs in nature- scheelite-quartz vein mineralizations and greisen in granite [5–8], quartz-scheelite veins in metabasite [9], scheelite in orogenic gold [10], and skarn deposits [11], published scheelite fluid inclusions (FIs) are somewhat limited.
Crystallization processes and genesis of scheelite in a quartz …
Scheelite is widely developed in quartz vein-type tungsten (W) polymetallic deposits, and CL images, REE patterns and Sr O isotope distributions of this mineral provide important constraints regarding its precipitation mechanism. We undertook a systematic investigation of the geochemistry (using in-situ Sr O isotopes, EPMA, and LA …
Co-genetic formation of scheelite- and wolframite-bearing quartz veins …
Co-genetic formation of scheelite- and wolframite-bearing quartz veins in the Chuankou W deposit, South China: Evidence from individual fluid inclusion and wall-rock alteration analysis
Granite-related Yangjiashan tungsten deposit, southern …
The measured δD values of the extracted fluid inclusion waters in the quartz from the greisen and veins are − 87 and − 85 to − 68‰, respectively (ESM Table 5 ; Fig. ... Shelton K, Falck H (2007) Geochemical investigations of the high-grade quartz–scheelite veins of the Cantung mine, Northwest Territories. Geol Surv Can Open File 5344 ...
Scheelite
Mineralized quartz veins in granite are usually bordered by greisen zones, which can be much wider than the veins themselves, and may extend into slates bordering the granites. The greisen, products of hydrothermal alteration and replacement of the veins' wall rock, developed during or immediately following veining.
Recycling of tailings from the Barruecopardo tungsten
The Barruecopardo mine, located in Salamanca, is a W greisen-type ore deposit that consists mainly of granitic rocks with scheelite, wolframite, pyrite, abundant …
How did Saloro reopen an old tungsten open-pit mine?
Since 2007, the Spanish mining company Saloro has been working on the reopening of an old tungsten mine in Barruecopardo.
(PDF) Wolframite
From the Black Pine mine, Granite County, ... Scheelite bearing greisen and quartz-tourmaline veins are reported from the basement gneiss at Lawari-Amboli area, Chandrapur district, Maharashtra ...
Mineralogy, fluid inclusion and isotope signatures: …
Fluid inclusions in quartz and scheelite from both greisen and quartz vein stages include vapor-rich and dominant liquid-rich types. ... 2019a); this deposit is characterized by swarms of scheelite-quartz veins located near the contact zone between Neoproterozoic slate and Devonian granite (Xie et al., 2019a, Li et al., 2021). ... Macraes …
Multistage hydrothermal quartz veins record the ore …
Quartz samples used for LA–ICP–MS trace element and fluid inclusion analyses were collected from quartz-bearing veins of drill holes and mining pits at Meiling. A summary of the quartz samples used for LA–ICP–MS trace element analysis and their detailed features are shown in Table 1.