scholarly journals Geochemical and mineralogical controls on metal(loid) mobility in the oxide zone of the Prairie Creek Deposit, NWT

2017 ◽  
Vol 17 (1) ◽  
pp. 21-33 ◽  
Author(s):  
Drew Stavinga ◽  
Heather Jamieson ◽  
Daniel Layton-Matthews ◽  
Suzanne Paradis ◽  
Hendrik Falck
Keyword(s):  
Oxide Zone

Atacamite in the oxide zone of copper deposits in northern Chile: involvement of deep formation waters?

2006 ◽  
Vol 42 (3) ◽  
pp. 205-218 ◽  
Author(s):  
Eion M. Cameron ◽  
Matthew I. Leybourne ◽  
Carlos Palacios
Keyword(s):  
Northern Chile ◽  
Copper Deposits ◽  
Oxide Zone

scholarly journals Effective Gold Recovery from Near-Surface Oxide Zone Using Reductive Microwave Roasting and Magnetic Separation

Metals ◽  
2018 ◽  
Vol 8 (11) ◽  
pp. 957 ◽  
Author(s):  
Bong-Ju Kim ◽  
Kang Cho ◽  
Sang-Gil Lee ◽  
Cheon-Young Park ◽  
Nag-Choul Choi ◽  
...  
Keyword(s):  
Magnetic Separation ◽  
Chemical Reduction ◽  
Surface Oxide ◽  
Gold Recovery ◽  
Near Surface ◽  
Microwave Roasting ◽  
Iron Minerals ◽  
Oxide Zone ◽  
Gold Ore Deposit ◽  
Content Of Gold

High content of gold in near-surface oxide zones above the gold ore deposit could be recovered using cyanidation. However, restricting the use of cyanide in mines has made it difficult to recover gold within the oxide zone. In this study, we investigated an application of the reductive microwave roasting and magnetic separation (RMR-MS) process for the effective gold recovery from ores in a near-surface oxide zone. Ore samples obtained from the near-surface oxide zone in Moisan Gold Mine (Haenam, South Korea) were used in RMR-MS tests for the recovery of iron and gold. The effect of the RMR process on the recovery of iron and gold was evaluated by given various conditions of the microwave irradiation as well as the dosages of reductant and additive. The microwave roasting resulted in a chemical reduction of non-magnetic iron oxide minerals (hematite) to magnetite minerals, such as magnetite and maghemite. This mineral phase change could induce the effective separation of iron minerals from the gangue minerals by magnetic separation process. The increased iron recovery was directly proportional to the gold recovery due to the coexistence of gold with iron minerals. The RMR-MS process could be a promising method for gold recovery from the ores in near-surface oxide zones.

Oxide zone geochemistry

1991 ◽  
Vol 28 (06) ◽  
pp. 28-3304-28-3304
Keyword(s):  
Oxide Zone

Bideauxite, a new Arizona mineral

1970 ◽  
Vol 37 (290) ◽  
pp. 637-640 ◽  
Author(s):  
Sidney A. Williams
Keyword(s):  
New Mineral ◽  
Strong Light ◽  
Space Group ◽  
Oxide Zone ◽  
White Streak

SummaryBideauxite is a new mineral found in specimens from the Mammoth-St. Anthony mine, Pinal County, Arizona. The composition is Pb2AgCl3(F,OH)2 with Pb, Ag, Cl, F by duplicate wet analyses. Z = 16, G. calc. 6·256, meas. 6·274 (at 24·2 °C). Crystals are isometric hexoctahedral with a 14·132 Å. Space group Fd3m. Crystals show a, o, d, m {113}, μ {114}, n {112}, φ {116}, and {029} in decreasing order of importance. Colourless, transparent with white streak. Isotropic with nD 2·192. le, almost sectile, withc onchoidal fracture. H = 3. Turns pale lavender in strong light. Low M.P. B.P. Decomposes in acids and warm NH4OH. Bideauxite is an oxide zone mineral found with leadhillite, matlockite, and anglesite. May alter to cerussite.

A garnierite with a high nickel content from Western Australia

1975 ◽  
Vol 40 (309) ◽  
pp. 65-69 ◽  
Author(s):  
E. H. Nickel ◽  
P. J. Bridge
Keyword(s):  
Western Australia ◽  
Electron Probe ◽  
Nickel Content ◽  
Nickel Sulphide ◽  
Sulphide Deposit ◽  
High Nickel Content ◽  
Oxide Zone ◽  
High Nickel

SummaryThe garnierite, which occurs in the oxide zone overlying a nickel sulphide deposit, consists of talc-like and serpentine-like components, with the former predominating. Chemical and electron-probe analyses give NiO contents ranging between 39.6 and 43.9 weight %.

Transmission Electron Microscopy of Isothermally Oxidized EB-PVD Thermal Barrier Coating on (Ni,Pt)Al Bondcoat

2005 ◽  
Vol 486-487 ◽  
pp. 149-152 ◽  
Author(s):  
Jai Won Byeon ◽  
S. Laxman ◽  
Yong Ho Sohn
Keyword(s):  
Thermal Barrier Coating ◽  
Microstructural Analysis ◽  
Isothermal Oxidation ◽  
Dark Field ◽  
Thermal Barrier ◽  
Dark Field Imaging ◽  
Barrier Coating ◽  
Transmission Electron ◽  
Oxide Zone ◽  
Field Imaging

The growth and microstructure of the thermally grown oxide (TGO) underneath the electron beam physical vapor deposited (EB-PVD) yttria stabilized zirconia (YSZ) topcoat were examined after short-term isothermal oxidation (1100 °C, up to 50 hours) for the as-coated and gritblasted (Ni,Pt)Al bondcoats. Microstructural analysis was carried out by a high resolution scanning transmission electron microscope equipped with bright/dark field imaging, high angle annular dark field imaging, and nano-spot energy dispersive spectroscopy. Presence of mixed oxide zone (MOZ) and a continuous Al2O3 oxide zone (COZ) was observed on the thermal barrier coating (TBC) with the as-coated (Ni,Pt)Al bondcoat. However, on the TBC with grit-blasted bondcoat, only the continuous-columnar Al2O3 scale was observed. For the as-coated type bondcoat, numerous voids were observed near the interface between MOZ and COZ after isothermal oxidation. On the other hand, COZ showed parabolic growth without any formation of voids for the grit-blasted specimens.

Tungsten-bearing rutile from the Kori Kollo gold mine, Bolivia

1998 ◽  
Vol 62 (3) ◽  
pp. 421-429 ◽  
Author(s):  
C. M. Rice ◽  
K. E. Darke ◽  
J. W. Still ◽  
E. E. Lachowski
Keyword(s):  
Hydrothermal System ◽  
Hydrothermal Fluids ◽  
Gold Mine ◽  
Backscatter Electron ◽  
Charge Balance ◽  
Sector Zoning ◽  
Oxide Zone ◽  
Growth Bands ◽  
Growth Zones ◽  
Double Substitution

AbstractW-bearing rutile formed during alteration of jarosite by resurgent hydrothermal fluids in the oxide zone of the Kori Kollo gold deposit. The rutile shows sector zoning in basal sections and well developed multiple growth zones, both defined in backscatter electron images by variations in the W content. The maximum WO3 content is 5.3 wt.% and W substitutes for Ti with double substitution of Fe to maintain charge balance. The causes of multiple growth bands are considered to be changes in externally controlled variables occurring in a shallow hydrothermal system. Whereas Ti is probably leached from biotite in dacitic rocks, the W is introduced by hydrothermal fluids.

Embreyite, a new mineral from Berezov, Siberia

1972 ◽  
Vol 38 (299) ◽  
pp. 790-793 ◽  
Author(s):  
S. A. Williams
Keyword(s):  
Single Crystals ◽  
Electron Probe ◽  
New Mineral ◽  
Space Group ◽  
Oxide Zone

SummaryEmbreyite is a new mineral that has been found only in old specimens collected at Berezov, Siberia. The composition is Pb4·97(CrO4)2·00(PO4)1·91.0·75H2O, or Pb5(CrO4)2(PO4)2. H2O based on both wet and electron-probe analyses. Z = I, Dmeas 6·45, Deale 6·41. Crystals are monoclinic with a 9·755 Å, b 5·636, c 7·135, β 103°5′ the space group may be P21/m. No single crystals were found. α = 2·20, β = γ = 2·36. Colour in various shades of orange with a yellow streak. H = 3½; no cleavages observed. Occurs with vauquelinite, crocoite, and phoenicochroite in the oxide zone assemblage from Berezov.

Creaseyite, Cu2Pb2(Fe,Al)2Si5O17-6H2O a new mineral from Arizona and Sonora

1975 ◽  
Vol 40 (311) ◽  
pp. 227-231 ◽  
Author(s):  
Sidney A. Williams ◽  
Richard A. Bideaux
Keyword(s):  
New Mineral ◽  
Oxide Zone

SummaryCreaseyite was first noted in specimens from Tiger, Arizona, and was then found at Wickenburg, Arizona, and Caborca, Sonora, prior to description. It is an oxide zone mineral occurring with wulfenite, willemite, mimetite, chrysocolla, wickenburgite, and ajoite. The composition is [Cu2Pb2(Fe,Al)2Si5O17-6HaO]. Colour Agathia green (R.H.S. 142B) with pale streak, H = 2½, Dmeas = 4.1, calc. 4.01. Crystals are orthorhombic with a 12.483, b 21.395, c 7.283. Z = 4.2Vγ 69° meas; α 1.737, β 1.747, γ 1.768.

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