.... 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...

...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...

... 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...

... 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 and near surface because...

... and base metals in the Rum Jungle area south of Darwin, in Australia’s Northern Territory, by drilling shallow auger holes on a 2,400- × 400-ft (732- × 122-m) grid. A prospector called Don Ronan, working for the BMR as a field assistant, noticed that peg 216S, 40E was on top of a gossan outcrop, so...

...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...

...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...

.... 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...

...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...

... and are generally consistent with the attitude of the limestone layers. The strata-bound deposit hosts 0.313 Mt of Cu (avg = 0.86 wt %), 20,000 t of Pb (avg = 1.77 wt %), 52,000 t of Zn (avg = 4.44 wt %), and 11 Mt Fe (avg = 48.21 wt %; L. Wang et al., 2011 ). A 50- to ~60-m gossan overlies the siderite zone...

..., 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...

... 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...

... 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...

... 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...

... Society of America 2015 supergene alteration critical zone gossan orecrete Bronze Age post-mining minerals tailings slags Supergene processes, irrespective of their natural or anthropogenic origin, lead to the formation of oxygen-bearing minerals from the polar to the tropical climatic...

... County, Kunming City Prefecture, Yunnan Province, P. R. China (26°11′N 103°51′E). The mineral is found in the oxidized zone (gossan) of an As-bearing Cu sulfide deposit and is clearly of supergene origin. Associated minerals are chalcopyrite, bornite, chalcocite, covellite, tennantite, enargite, cuprite...

... 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...

... some of the tin oxide-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...

... diffraction sur poudres analyse Rietveld Plumbojarosite, Pb[Fe 3 (SO 4 ) 2 (OH) 6 ] 2 , is a supergene mineral primarily found in gossans, which overlie massive sulfide deposits. Gossans are the residues of an intense acidic leaching, and are commonly enriched in trace elements such as Au, Ag...

..., polyphase folding, some of which is overturned. Cornell et 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...