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Geological Origin as the Basis for the Systematics of Deposits
Published in Artur Dyczko, Andrzej M. Jagodziński, Gabriela Woźniak, Green Scenarios: Mining Industry Responses to Environmental Challenges of the Anthropocene Epoch, 2022
Skarn deposits are formed at the contact of igneous rocks and carbonate deposits transformed into skarn (tactites). Skarn is a limestone-silicate rock. These deposits are formed at low or medium depths and form layers, lenses, veins, nests and complex forms.
Environmental elements in the Bonfim W-Au(Bi-Te) deposit, NE Brazil
Published in Adam Piestrzyński, Mineral Deposits at the Beginning of the 21st Century, 2001
Skarns developed on schist show a similar mineralogy, but they also contain plagioclase, garnet, alkali feldspar, clinozoisite/zoisite, sericite, allanite and arsenopyrite. These skarns also show three metasomatic zones from the protolith (schist) towards the inner skarn, as follows: Amphibole zone, constituted by actinolite.Pyroxene + plagioclase zone, that contains diopside, plagioclase, titanite, apatite, allanite, scheelite and molybdenite (prograde skarn). Alkali feldspath, clinozoisite/zoisite and sericite also occur and characterize the retrograde skarn. Epidote, prehnite, clorite, pyrrhotite, chalcopyrite, pyrite and arsenopyrite show a late development, and they are succeeded by the gold paragenesis (see below).Garnet zone, composed by garnet.
Investigation of optimal surface paste disposal design based on crack intensity
Published in International Journal of Mining, Reclamation and Environment, 2023
Atac Bascetin, Serkan Tuylu, Deniz Adiguzel
The mine site is located in the western part of Turkey, near the outskirts of the famous Ida Mountain. The history of the mine goes back to antiquity and the mine was also probably a lead supply for the ancient Trojan civilisation. The region is called the Biga Peninsula. The climate of the region is similar to the Mediterranean climate, mild to cold, with wet winters and hot, dry summers. Mineralisation observed in most of the mines located in the region shows the characteristics of skarn and hydrothermal mineralisation due to magmatic intrusions into the limestone. The ore body mostly contains galena, sphalerite, pyrite, and chalcopyrite. The main metals that are extracted in the mine are Pb-Zn [16]. Minor components are pyrrhotite, marcasite, bismuth, sulfosalts, arsenopyrite, tetrahedrite/tennantite, bornite, argentite, perovskite, magnetite, haematite, pyrolusite, orpiment/realgar, and native tellurium. The gangue mineral assemblage is strongly influenced by the limestone country rocks and consists of garnet, epidote, quartz, calcite, dolomite, fluorite, tremolite, and minerals of the actinolite group [17].
The geology of the Bozymchak Cu-Au skarn deposit, Tien Shan belt, Central Asia: emphasis on the geochemical characteristics of the granitoids
Published in Applied Earth Science, 2019
M. Abzalov, R. Djenchuraeva, Ye. Alpiyev, S. Abzalov
Two main types of skarns are present at the deposit, garnet – pyroxene and garnet – wollastonite. Garnet-pyroxene rocks form an inner zone of skarns, distributed directly at the contact with granodiorite. Garnet-wollastonite assemblage is distributed closer to the contact with carbonate rocks, forming the outer zone of skarns. This zone hosts copper–gold sulphide ore (Figure 5(a)), which is distributed commonly along the contact of garnet-wollastonite and garnet-pyroxene skarns. The main ore minerals are chalcopyrite, bornite, pyrite, pyrrhotite and gold. Magnetite is also present at the deposit, and is mostly abundant in the magnesian skarns developed on the dolomites.
Beneficiation of Lead-Zinc Ores – A Review
Published in Mineral Processing and Extractive Metallurgy Review, 2022
Aryasuta Nayak, M. S. Jena, N. R. Mandre
Skarn deposits are associated with vein deposits and such deposits are formed near or within magmatic plutons as a result of the interaction between magmato-hydrothermal fluids. Skarn deposits are massive and primarily consisting of Pb-Zn sulfides (Ghazi and Millette 1964).