scholarly journals Gold deposit type and implication for exploration in the Abiete-Toko Gold District, South Cameroon: constraint from morphology and microchemistry of alluvial gold grains

Heliyon ◽  
2021 ◽  
Vol 7 (4) ◽  
pp. e06758
Author(s):  
Gus Djibril Kouankap Nono ◽  
Edelquine Fai Bongsiysi ◽  
Primus Azinwi Tamfuh ◽  
Alexis Jacob Nyangono Abolo ◽  
Bertrand Fomekong Kehding ◽  
...  
Keyword(s):  
Gold Deposit ◽  
Alluvial Gold ◽  
Deposit Type

Geostatistical and GIS analysis of the spatial variability of alluvial gold content in Ngoura-Colomines area, Eastern Cameroon: Implications for the exploration of primary gold deposit

2018 ◽  
Vol 142 ◽  
pp. 138-157 ◽  
Author(s):  
Jonas Didero Takodjou Wambo ◽  
Sylvestre Ganno ◽  
Yannick Sthopira Djonthu Lahe ◽  
Gus Djibril Kouankap Nono ◽  
Donald Hermann Fossi ◽  
...  
Keyword(s):  
Spatial Variability ◽  
Gold Deposit ◽  
Gold Content ◽  
Gis Analysis ◽  
Alluvial Gold ◽  
Primary Gold ◽  
Eastern Cameroon

Geology of the Liese Zone, Pogo Property, East-Central Alaska

SEG Discovery ◽  
1999 ◽  
pp. 1-21
Author(s):  
MOIRA SMITH ◽  
JOHN F.H. THOMPSON ◽  
JASON BRESSLER ◽  
PAUL LAYER ◽  
JAMES K. MORTENSEN ◽  
...  
Keyword(s):  
Gold Deposit ◽  
Gold Mineralization ◽  
Geochemical Data ◽  
East Central ◽  
Gold Silver ◽  
Ore Minerals ◽  
Middle Paleozoic ◽  
Deposit Type ◽  
Alteration Minerals ◽  
Native Bismuth

ABSTRACT The Liese zone is a recently discovered high-grade gold deposit on the Pogo claims, approximately 90 miles (145 km) southeast of Fairbanks. A conservative geologic resource for the Liese zone is 9.98 million tons at an average grade of 0.52 oz/t, for a total of 5.2 million contained ounces. The region is underlain by highly deformed, amphibolite-grade paragneiss and minor orthogneiss of the Late Proterozoic(?) to middle Paleozoic Yukon-Tanana terrane, which has been intruded by Cretaceous felsic granitoid bodies thought to be related to gold mineralization in the Fairbanks area and elsewhere along the Tintina gold belt. The Liese zone is hosted primarily in gneiss, and lies approximately 1.5 km south of the southern margin of the Late Cretaceous Goodpaster batholith. Mineralization occurs in three or more tabular, gently dipping quartz bodies, designated L1 (uppermost), L2, and L3 (lowermost). The thickness of the quartz bodies ranges from 1 to 20 m, averaging approximately 7 m. The quartz contains approximately 3 percent ore minerals, including pyrite, pyrrhotite, loellingite, arsenopyrite, chalcopyrite, bismuthinite, various Ag-Pb-Bi ± S minerals, maldonite, native bismuth, and native gold. Early biotite and later quartz-sericite-stockwork and sericite-dolomite alteration are spatially associated with the Liese zone, which shows characteristics of both vein and replacement styles of mineralization. Geochemical data indicate a strong correlation between gold and bismuth, and weaker correlations between gold, silver, and arsenic. Based on U-Pb dating of intrusive rocks, the Liese zone was formed between 107 and 94.5 m.y. ago, although 40Ar/39Ar cooling ages on alteration minerals return younger ages of 91 Ma, suggesting a protracted or multiphase thermal history. The Liese zone may represent a deep-seated manifestation of the "intrusion-related" gold deposit type.

GEOCHEMICAL FEATURES OF NATIVE GOLD AS DIRECT SIGNS OF ORE FORMATION LODE AND ALLUVIAL GOLD OCCURRENCE TYPES

2020 ◽  
pp. 22-31
Author(s):  
S. A. Milyaev ◽  
G. G. Samosorov ◽  
S. V. Yablokova ◽  
L. V. Shatilova ◽  
N. N. Pozdnyakova
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Gold Deposit ◽  
Native Gold ◽  
Element Distribution ◽  
Igneous Rocks ◽  
Sulfide Mineralization ◽  
Ore Formation ◽  
Alluvial Gold ◽  
Geochemical Indicators

The features of impurity element distribution in native gold of two ore formation gold deposit types are con- sidered. A typomorphic set of elements for gold-polysulfide-quartz and gold-quartz low-sulfide mineralization was determined. Geochemical indicators for estimating ore formation types of native gold are offered. The differences in gold composition due to metallogenic specialization of regions are established. Data on the distribution of rare-earth elements in native gold are obtained, which allows to predict igneous rocks composition during gold-polysulfide-quartz deposit formation.

Chapter 1: Gold Deposit Types: An Overview

2020 ◽  
pp. 1-28
Author(s):  
Richard H. Sillitoe
Keyword(s):  
Gold Deposit ◽  
Unknown Origin ◽  
Mafic Magma ◽  
Massive Sulfide ◽  
Gold Deposits ◽  
Hydrothermal Fluids ◽  
Copper Gold ◽  
Deposit Type ◽  
Ambient Surface

Abstract Gold is either the only economically important metal or a major by-product in 11 well-characterized deposit types—paleoplacer, orogenic, porphyry, epithermal, Carlin, placer, reduced intrusion related, volcanogenic massive sulfide (VMS), skarn, carbonate replacement, and iron oxide-copper-gold (IOCG), arguably more than for those of any other metal; it also dominates a number of deposits of uncertain or unknown origin. Major gold concentrations formed worldwide from the Mesoarchean to the Pleistocene, from Earth’s surface to midcrustal paleodepths, alone or in association with silver, base metals, and/or uranium, and from hydrothermal fluids of predominantly metamorphic, magmatic, meteoric, seawater, or, uncommonly, basinal origins, as well as from mafic magma or ambient surface water. Most of the Neoproterozoic and Phanerozoic deposits unequivocally formed in accretionary orogens. As an introduction to this compilation of the world’s major gold deposits and provinces, this paper provides a thumbnail sketch of each gold deposit type, including geologic and economic characteristics and widely accepted genetic models, as well as briefly discusses aspects of their spatial and temporal associations and distributions.

scholarly journals Major and Trace Element Geochemistry of Pyrite and Pyrrhotite from Stratiform and Lamellar Orebodies: Implications for the Ore Genesis of the Dongguashan Copper (Gold) Deposit, Eastern China

Minerals ◽  
2018 ◽  
Vol 8 (9) ◽  
pp. 380 ◽  
Author(s):  
Zhongfa Liu ◽  
Yongjun Shao ◽  
Haodi Zhou ◽  
Nan Liu ◽  
Kuanxin Huang ◽  
...  
Keyword(s):  
Gold Deposit ◽  
Inductively Coupled Plasma ◽  
Eastern China ◽  
Gold Deposits ◽  
Trace Element Geochemistry ◽  
Magma Intrusion ◽  
Element Geochemistry ◽  
Important Region ◽  
Copper Gold ◽  
Deposit Type

The Dongguashan copper (gold) deposit in Anhui Province is one of the largest copper (gold) deposits in the Tongling ore district, which is the most important region in the Middle–Lower Yangtze River Metallogenic Belt, Eastern China. Stratiform and lamellar orebodies are the major deposit types. Pyrite and pyrrhotite from the stratiform deposit type (Py I, Po I) and lamellar deposit type (Py II, Po II) are investigated using Electron-probe Microanalyses (EPMA) and Laser Ablation Inductively Coupled Plasma Mass Spectrometry (LA-ICP-MS). Py I, Py II, Po I and Po II have high contents of Cu, Co, Au and Se, low contents of As, Pb and Zn, with Co/Ni ratios of 0.50−48.00, 4.00−45.00, 1.55−14.45 and 1.02−1.36, respectively, most of which are greater than 1 and vary widely; these characteristics are consistent with those of pyrite with a magmatic–hydrothermal origin. The higher Au/Ag and Fe/(S + As) ratios of pyrite and crystallization temperatures (286–387 °C) of hexagonal pyrrhotite indicate that the mineralization occurrs in environments with medium- to high-temperatures, high sulfur fugacity and medium-shallow depths. Therefore, we suggest that the Dongguashan copper (gold) deposit is a stratabound skarn-type ore deposit associated with magma intrusion activity during the Yanshanian Period.

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