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gossan

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Journal Article
Journal: Economic Geology
Published: 01 May 2023
Economic Geology (2023) 118 (3): 599–620.
.... Samples of gossan, near-surface rock, and deeper hypogene rock were submitted for analytical, mineralogical, and kinetic geochemical testing to investigate the origin of the leachable selenium, its mineralogical form, and the release mechanisms. This paper presents testing results and implications...
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Journal Article
Published: 08 March 2023
Bulletin de la Société Géologique de France (2023) 194 (1): 3.
...Rayane El Ghastalany; Yannick Branquet; Mohamed Abdoullah Bagga; Imad Khalil Taviche; Amina Wafik; Mohamed Ghnahalla; El Houssein Abdeina Résumé Les chapeaux de fer (ou gossans) développés à l’aplomb d’une minéralisation sulfurée et/ou oxydée primaire restent un métallotecte majeur pour...
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Journal Article
Journal: Economic Geology
Published: 01 August 2022
Economic Geology (2022) 117 (5): 1149–1177.
... focused on Cu-bearing stockwork mineralization (1973–1986) and gold-bearing gossans (1974–2002). Since 2015, Atalaya Mining PLC has extracted high-grade zones of the stockwork of the Cerro Colorado area ( Fig. 1 ). Current resources are estimated at 455 Mt @ 0.42% Cu with a potential mine life of more...
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Journal Article
Journal: SEG Discovery
Published: 01 July 2021
SEG Discovery (2021) (126): 16–27.
... to tectonic uplift and consequent phreatic zone descent. Scale bar = 1 cm. Mineral Park, Arizona, USA. The leached capping (disseminated sulfides)-gossan (massive to semimassive sulfides) environment is characterized by variably developed oxide minerals dominated by iron that remains in the surface...
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Journal Article
Journal: SEG Discovery
Published: 01 January 2020
SEG Discovery (2020) (120): 15–21.
... of a gossan outcrop, so it would be impossible to drill an auger hole there. The gossan was later found to assay up to 4.8% Pb—not surprisingly, since it contained visible cerussite. Infill geochemistry was recommended ( Dodson and Shatwell, 1965 ) and completed in the 1965 field season ( Shatwell, 1966...
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Journal Article
Published: 01 January 2019
European Journal of Mineralogy (2019) 31 (1): 167–172.
...Anthony R. Kampf; Pedro Alves; Anatoly Kasatkin; Radek Škoda Jahnsite-(MnMnZn) (IMA2017-113), Mn 2 2 + Zn 2 Fe 2 3 + ( PO 4 ) 4 ( OH ) 2 ∙ 8 H 2 O , is a new member of the jahnsite group from the Herdade dos Pendões mine, Beja district, southwest Portugal. It formed in a highly altered gossan...
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Journal Article
Journal: Economic Geology
Published: 01 May 2018
Economic Geology (2018) 113 (3): 769–778.
...S. Wafforn; S. Seman; J. R. Kyle; D. Stockli; C. Leys; D. Sonbait; M. Cloos Abstract The Big Gossan skarn (71 million tonnes of 2.4 wt % Cu and 0.9 ppm Au at a 1% Cu cutoff) is located in the prolific Ertsberg-Grasberg mining district, on the island of New Guinea in eastern Indonesia. The skarn...
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Journal Article
Published: 01 May 2018
Mineralogical Magazine (2018) 82 (S1): S307–S320.
.... Open pits and underground galleries at Castromil-Serra da Quinta exploited the gossan formed from the weathering of primary mineralization. The gossan is composed essentially of goethite, scorodite and clay minerals. A recent drilling campaign at Castromil-Serra da Quinta has provided samples...
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Journal Article
Published: 19 July 2017
Geochemistry: Exploration, Environment, Analysis (2017) 17 (4): 345–355.
...Ahmad M. Al-Saleh Abstract Previous exploration delineated Ni-Cu-PGE targets within a peridotite and gabbro unit at the southern tip of the Wadi Kamal layered complex. Stream sediment samples were collected from wadis draining the KMS-1 and nearby gossans. R-mode factor analysis was applied...
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Journal Article
Journal: Economic Geology
Published: 01 June 2017
Economic Geology (2017) 112 (4): 889–918.
... Donggangling limestone hosts a strata-bound Cu-Pb-Zn deposit covered by siderite and gossan mineralization to the east of the Jurassic porphyries. There is still debate as to whether the strata-bound Cu-Pb-Zn deposit is related to Jurassic porphyry-style mineralization ( Liu and Zhou, 1985 ; Huang et al...
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Journal Article
Published: 01 October 2016
Mineralogical Magazine (2016) 80 (6): 949–958.
..., gypsum, ktenasite, mimetite, schulenbergite and smithsonite on limonitic gossan. Pauladamsite forms green, multiply twinned blades up to 0.5 mm long grouped in radial sprays. The streak is pale green. Crystals are transparent and have vitreous to silky lustre. The Mohs hardness is ∼2, the tenacity...
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Journal Article
Published: 01 March 2016
South African Journal of Geology (2016) 119 (1): 63–76.
... collected by the Hyperion sensor. New synergies between multispectral and hyperspectral spaceborne data can be demonstrated, such as the Iron Feature Depth index (IFD), which has recently been proposed for mine waste mapping in the North West Province of South Africa and for gossan detection at Haib River...
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Journal Article
Journal: Economic Geology
Published: 01 December 2015
Economic Geology (2015) 110 (8): 2109–2126.
... operation is focused on the supergene Cu-enriched zone (initial reserves of 17.6 Mt @ 6.2% Cu). An Au-Ag-Pb–rich gossan resource (3.6 Mt @ 3.3% Pb, 2.5 g/t Au, and 56.3 g/t Ag) occurs in the upper part of the deposit. The Au grade ranges from 0.01 ppm to >100 ppm, and occurs as three different Au ore...
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Journal Article
Published: 01 November 2015
American Mineralogist (2015) 100 (11-12): 2484–2496.
... indicating a direct precipitation from solutions does not exclude that a smectite amount could be genetically related to hydrothermal fluids, even if several other characteristics (e.g., the paragenetical association with Fe-hydroxides typical of gossans) confirm the supergene origin for the bulk...
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Journal Article
Journal: Elements
Published: 01 October 2015
Elements (2015) 11 (5): 311–316.
... Society of America 2015 supergene alteration critical zone gossan orecrete Bronze Age post-mining minerals tailings slags Supergene mineral deposits and orecretes have played key historical roles in the economic development of ancient and modern societies, but also have resulted...
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Journal Article
Published: 01 March 2011
European Journal of Mineralogy (2011) 23 (2): 179–196.
... clayey horizons exceptionally enriched in Ni and Cu even in areas distant from the orebodies and the related gossan outcrops. A preliminary study of the mineralogy in these profiles including bulk analyses by electron microprobe (EMP) and energy dispersive X-ray spectrometry (EDS), showed...
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Journal Article
Published: 01 October 2010
European Journal of Mineralogy (2010) 22 (5): 751–761.
...-infiltrated furnace ceramics may have been recycled and thus are thought to account for much of the silica and alumina in the slags whereas their generally high iron content may be related to inclusion in the smelt of iron-bearing carbonates and/or the iron-rich gossan overlaying the deposit. The present...
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Journal Article
Published: 01 June 2010
The Canadian Mineralogist (2010) 48 (3): 651–659.
... § E-mail address : peterson@geol.queensu.ca jarosite plumbojarosite sulfate mineralogy environmental mineralogy crystal structure powder diffraction Rietveld analysis Plumbojarosite, Pb[Fe 3 (SO 4 ) 2 (OH) 6 ] 2 , is a supergene mineral primarily found in gossans, which overlie...
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Journal Article
Journal: Economic Geology
Published: 01 December 2009
Economic Geology (2009) 104 (8): 1277–1281.
... al. (2009) further note that the sample from Gamsberg was collected from a gossan, yet fail to provide a proper geologic description of this “gossan.” While we do not contest the existence of the gossan, we do question its origin and geologic relevance. Field mapping in the district ( Beukes et al...
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Journal Article
Journal: Economic Geology
Published: 01 December 2009
Economic Geology (2009) 104 (8): 1282–1285.
.... This sample, for which we give a GPS locality, was taken from a thin quartzite which is completely surrounded by the ~25-m-thick gossan of the Gams Ore Member, the surface expression of the orebody on Gamsberg, with a strike length of 5.3 km ( Rozendaal, 1982 , 1986 ). The sample clearly represents...
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