Petrogenesis of a Neoproterozoic magmatic arc hosting porphyry Cu-Au mineralization at Jebel Ohier in the Gebeit Terrane, NE Sudan

Bierlein, Frank P; Reynolds, Neal A.; Arne, Dennis C.; Bargmann, Chris J.; McKeag, S. A.; Bullen, Warwick; Al-Athbah, H.; McKnight, Stafford; Maas, Roland

doi:10.1016/j.oregeorev.2016.05.010

Cited by 27 publications

(3 citation statements)

References 57 publications

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“…Number of study areas References Sudan 1 [39], [40], [41] Namibia 1 [42], [43], [44] Argentina 4 [45], [46], [47] , [48], [49], [50], [51], [52], [53], [54], [55], [56] Iran 4 [57], [58], [59], [60], [61], [62], [63], [64], [65] , [66], [67], [68], [69], [70] Pakistan 3 [71], [72], [73], [74], [75], [76] , [77], USA 5 [71], [78], [79], [80], [81], [82], [83] [84], [85], [86], [87] , [88], [89]…”

Section: Regionmentioning

confidence: 99%

From Pixels to Deposits: Porphyry Mineralization With Multispectral Convolutional Neural Networks

Zidan,

Desouky,

Gaber

et al. 2023

IEEE J. Sel. Top. Appl. Earth Observations Remote Sensing

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Mineral exploration is essential to ensure a sustainable supply of raw materials for modern living and the transition to green. It implies a series of expensive operations that aim to identify areas with natural mineral concentration in the crust of the Earth. The rapid advances in artificial intelligence and remote sensing techniques can help in significantly reducing the cost of these operations. Here, we produce a robust intelligent mineral exploration model that can fingerprint potential locations of porphyry deposits, which are the world's most important source of copper and molybdenum and major source of gold, silver, and tin. We present a deep learning pipeline for assessing multispectral imagery from the Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) with the objective of identifying hydrothermal alterations. Our approach leverages a Convolutional Neural Network (ConvNet) to analyze the highresolution images, overcoming computational challenges through a patch-based strategy that involves an overlapping window for partitioning the images into fixed-size patches. Through the utilization of manually labeled patches for image classification and identification of hydrothermal alteration areas, our results demonstrate the remarkable ability of ConvNet to accurately detect hydrothermal alterations. The technique is adaptable for other ore deposit models and satellite imagery types, providing a revolution in satellite image interpretation and mineral exploration.

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Section: Regionmentioning

confidence: 99%

From Pixels to Deposits: Porphyry Mineralization With Multispectral Convolutional Neural Networks

Zidan,

Desouky,

Gaber

et al. 2023

IEEE J. Sel. Top. Appl. Earth Observations Remote Sensing

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“…Orogenic gold and copper deposits are spatially associated in many magmatic-hydrothermal systems including porphyry copper styles [25][26][27]84,85] and IOCG deposits [32,36]. Globally, there are two main styles of mineralizations rich in iron oxides: IOCG and iron oxide-apatite (IOA) deposits.…”

Section: Metallogenesis Of Ore Types (Ore Characterization and Ore Ge...mentioning

confidence: 99%

“…Gold-bearing quartz veins in the Neoproterozoic basement rocks of the Eastern Desert of Egypt were the main targets of gold for ancient workers and investigators [4,6,9,10], but recently, goldbearing alteration zones hosted in the structurally controlled shear zones are well-known type of gold deposits in the ANS [11][12][13][14][15][16][17][18]. The gold-hosting porphyry copper system is recorded in the ANS specifically at the south Eastern Desert (SED) and north Sudan [19][20][21][22][23][24][25][26][27]. Hydrothermal iron oxide copper gold (IOCG) deposits have a long history of major resources of economic metals such as iron, copper, gold, silver, and uranium [28][29][30][31][32][33][34][35][36].…”

Section: Introductionmentioning

confidence: 99%

Au-Cu Resources in Some Mines from Antiquity in the South Gabal Um Monqul and Gabal Al Kharaza Prospects, North Eastern Desert, Egypt

Atef,

Surour,

Madani

et al. 2023

Geosciences

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Since Antiquity, sustainable resources of gold and copper have been mined at two prominent prospects in the north Eastern Desert of Egypt, namely the south Gabel Um Monqul (SGUM) and Gabal Al Kharaza (GKZ). Mineralization is hosted by Neoproterozoic shield rocks represented by dacite and monzo- to syenogranite at the SGUM prospect whereas they are diorite, granodiorite, and quartz feldspar porphyry at the GKZ prospect. These hosts have been emplaced in an island arc environment from calc-alkaline magmas with a peraluminous to metaluminous signature. They are hydrothermally altered including albitization, sericitization, silicification, epidotization, and chloritization. The Au and Cu mineralizations are confined to shear zones that lately filled with auriferous quartz veins adjacent to mineralized alteration zones. In the GKZ prospect, the old trenches trend mainly in a NW–SE direction whereas it is NE–SW and NW–SE in the SGUM prospect. Evidence of shearing ranges from megascopic conjugate fractures and shear planes in the outcrops to microscopic sheared and crumbled Au-Cu ore assemblages dominated by Fe-Cu sulfides, specularite, and barite. Microscopic investigation suggests that the formation of specularite is due to the shearing of early existing magnetite. The ore textures and paragenetic sequence indicate that pyrite in the alteration zones is oxidized, leading to the liberation of gold up to 3.3 g/t. The formulae of the analyzed electrum lie in the range Au74.5-76.8 Ag22.2-24.5. Integration of the field, geochemistry, and mineral chemistry data, combined with the gold fire assay data prove the presence of sustainable amounts of disseminated Au and Cu, not only in the mineralized quartz veins, but also in the alteration zones. Data materialized in our paper show similarities in the style of mineralization at the SGUM and the GKZ prospects with iron oxide-copper-gold (IOCG) deposits elsewhere in the Arabian-Nubian Shield (ANS) and other world examples.

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Ore Deposits in the Arabian-Nubian Shield

Botros¹

2021

The Geology of the Arabian-Nubian Shield

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Petrogenesis of a Neoproterozoic magmatic arc hosting porphyry Cu-Au mineralization at Jebel Ohier in the Gebeit Terrane, NE Sudan

Cited by 27 publications

References 57 publications

From Pixels to Deposits: Porphyry Mineralization With Multispectral Convolutional Neural Networks

From Pixels to Deposits: Porphyry Mineralization With Multispectral Convolutional Neural Networks

Au-Cu Resources in Some Mines from Antiquity in the South Gabal Um Monqul and Gabal Al Kharaza Prospects, North Eastern Desert, Egypt

Ore Deposits in the Arabian-Nubian Shield

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