scholarly journals PROSPECTS OF NEWLY DISCOVERED UGUR AREA IN THE NORTHWEST OF THE GEDABEY ORE DISTRICT (LESSER CAUCASUS, AZERBAIJAN)

2021 ◽  
pp. 53-63
Author(s):  
N. Imamverdiyev ◽  
V. Baba-zadeh ◽  
S. Mursalov ◽  
A. Valiyev ◽  
M. Mansurov ◽  
...  
Keyword(s):  
Gold Mineralization ◽  
Gold Silver ◽  
Rock Chip ◽  
Hydrous Ferric Oxides ◽  
Lesser Caucasus ◽  
Exploration Area ◽  
Drill Holes ◽  
Positive Results ◽  
East West ◽  
Ore District

The article describes Ugur exploration area located in Gedabey Ore District of the Lesser Caucasus in NW of Azerbaijan. Results of trenches and channels sampling on the surface, RC bore holes and summary of significant drill intercepts (>0.29 ppm Au) of Ugur Exploration area are presented. It has been established that The deposit is enlarged by highly gold-silver result of surface outcrop rock chip samples over an area of 2.5 kms North-South by 2 kms East-West, with the Reza gold deposit located in the central part. Out of metallic minerals crystalline hematite was observed. On surface intensive barite and barite-hematite vein and veinlets, also gossan zones were observed. The main mineralization zones have been sampled in three trenches at a distance up to 270 m by trenches #1, #2 and #3 and received positive results for gold and silver. Also there have taken approximately 550 samples from outcrop #1 and #2. On the main orebody at surface centre there occured secondary quartzites with vein-veinlets barite-hematite mineralization over which there remain accumulations of hydrous ferric oxides cementing breccias of quartz and quartzites. And in erosion parts "reddish mass" being oxidation product of stock and stockverk hematite ores were observed. Representing typical gossans, these accumulations by the data of trenches for thickness about 5-10 m contain gold 0.3-2.0 ppm and silver 1.0-15.0 ppm. Ten diamond drill holes, named UGDD 01-10 were drilled in the center part of the deposit. The drill holes were sampled mainly in 1 meter lengths from the top of the hole to the bottom. The core samples were marked and placed into standard boxes. Significant intervals of weighted averages greater than 0.29 ppm over down hole intervals of 1 metres or greater (>0.29 ppm Au and >0.9 m) are summarized in table 3 below. In conclusion, the outcropping alteration at the deposit is typical of the upper steam-heated levels of high-sulfidation epithermal (HSE) deposits, which in most mineralized systems of this type, may cap higher-grade gold mineralization which is hosted by underlying vuggy and oxide zones.

scholarly journals New perspective Reza gold deposit (Gedabek ore district, Lesser Caucasus, Azerbaijan)

2021 ◽  
Vol 30 (1) ◽  
pp. 53-64
Author(s):  
Nazim A. Imamverdiyev ◽  
Vasif M. Baba-zadeh ◽  
Samir S. Mursalov ◽  
Anar A. Valiyev ◽  
Mamoy I. Mansurov ◽  
...  
Keyword(s):  
Gold Deposit ◽  
Gold Mineralization ◽  
High Sulfidation ◽  
Gold Grade ◽  
Lesser Caucasus ◽  
New Perspective ◽  
Exploration Area ◽  
A Minor ◽  
Ore District ◽  
Gold Bearing

The article describes Reza gold deposit of Ugur exploration area located in Geda- bek Ore District of the Lesser Caucasus in NW of Azerbaijan. It is established that main mineralization in the Reza gold deposit consists of hematite-barite-quartz-kaoline veins- veinlets and breccia, pyrite stock-stockverk and quartz-sulfide veins. On the main orebody surface center secondary quartzites with vein-veinlets barite-hematite mineralization have occured over which remain accumulations of hydrous ferric oxides cementing breccias of quartz and secondary quartzites. “Reddish mass” is also observed in erosion parts, being an oxidation product of stock and stockverk limonite-hematite ores. Representing typical gossans, these accumulations by the data of trenches for thickness about 5-10 m contain gold 0.3-3.5 ppm and silver 1.0-45.0 ppm. There are three zones of gold mineralization within the Reza gold deposit: oxide mineralization; transition zone mineralization; sulfide mineralization. The oxide gold mineraliza- tion consists of clay-gravel weathering crust of kaolinite type. The gold-bearing mineralization has been oxidized to a depth of ap- proximately 50-100 meters. Typically, the gold mineralization is coarser and a minor increase in gold grade occurs within the oxides compared to the original rocks. The nugget effect increase in the gold grade of the oxides does not exceed approximately 10%. Deposit alteration signature has characteristics which suggest the current outcrop level may be near the top of a mineralized, gold-bearing high sulfidation epithermal (HSE) system. The gold mineralization at the deposit is interpreted as forming in shallow high sulfidation epith- ermal systems. The mineralization has been noted in well-confined hydrothermal breccia and associated with pyrite stock-stockwork. The majority of the deposit material and current estimates are formed within the barite-hematite-quartz-kaoline mineralization in the secondary quartzite rocks. The main brecciation and stockwork are hosted within secondary quartzite, sometime massive silicified andesite porphyritic rocks.

scholarly journals О геологическом и изотопном возрасте золоторудных месторождений на примере золото-серебряного месторождения Кубака (Северо-Восток России)

2021 ◽  
pp. 3-12
Author(s):  
V. A. Stepanov ◽  
Keyword(s):  
Gold Mineralization ◽  
Early Carboniferous ◽  
North East ◽  
The North ◽  
Ore Bodies ◽  
Geological Age ◽  
Gold Silver ◽  
Devonian Age ◽  
Isotope Dating ◽  
Silver Mineralization

Information on the geological and isotopic age of the Kubaka gold-silver deposit in the Omolon middle massif in the North-East of Russia is presented. It has been established that the Kubaka deposit geological age lies in between the Late Devonian age of the Kedon series volcanites, containing the gold-silver mineralization, and the Early Carboniferous age of the Korbinsky suite terrigenous rocks, overlapping the volcanites and the mineralization. The post-ore nature of the Omolon complex dykes, which produce no significant impact on the distribution of gold mineralization in ore bodies, is shown. According to isotope dating, the following stages of the Kubaka deposit formation are distinguished: the accumulation of the Kubaka suite tuffs (369 Ma); the introduction of subvolcanic intrusions (344 and 337 Ma); the formation of ore metasomatites (335±5 Ma); the formation of gold-silver mineralization (330 and 334 - 324 Ma); the introduction of post-ore dikes (179±8 - 176±10 Ma).

Porphyry Copper Discovery Beneath the Valeriano Lithocap, Chile

SEG Discovery ◽  
2016 ◽  
pp. 1-20
Author(s):  
Richard H. Sillitoe ◽  
Claudio Burgoa ◽  
David R. Hopper
Keyword(s):  
Gold Mineralization ◽  
Porphyry Copper ◽  
Northern Chile ◽  
Porphyry Copper Deposits ◽  
Copper Deposits ◽  
Alteration Zones ◽  
Copper Gold ◽  
Drill Holes

ABSTRACT Exploration for porphyry copper deposits beneath barren or poorly mineralized, advanced argillic lithocaps is becoming common­place; however, there have been few discoveries except in cases where the copper ± gold ± molybdenum mineralization has been partly exposed, typically as a result of partial lithocap erosion. At Valeriano, in the high Andes of northern Chile, completely concealed Miocene porphyry copper-gold mineralization was recently discovered beneath a lithocap. Here, the results of the staged drilling program that led to the discovery are summarized, with emphasis on the key geologic, alteration, and mineralization features that provided guidance. The final deep drill holes of the 16-hole program cut well-defined advanced argillic and sericitic alteration zones before entering chalcopyrite ± bornite–bearing, potassic-altered porphyry, with grades of 0.7 to 1.2% Cu equiv, at depths of ~1,000 to >1,800 m.

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.

scholarly journals Characteristics of Gold Mineralization at the Ciurug Vein, Pongkor Gold-Silver Deposit, West Java, Indonesia

2005 ◽  
Vol 55 (3) ◽  
pp. 225-238 ◽  
Author(s):  
Syafrizal ◽  
Akira Imai ◽  
Yoshinobu Motomura ◽  
Koichiro Watanabe
Keyword(s):  
Gold Mineralization ◽  
Silver Deposit ◽  
West Java ◽  
Gold Silver

Mineral prospectivity mapping using a VNet convolutional neural network

2021 ◽  
Vol 40 (2) ◽  
pp. 99-105
Author(s):  
Michael McMillan ◽  
Eldad Haber ◽  
Bas Peters ◽  
Jennifer Fohring
Keyword(s):  
Artificial Intelligence ◽  
Gold Mineralization ◽  
Spatial Scales ◽  
Canadian Arctic ◽  
Novel Technologies ◽  
Regional Trends ◽  
Resource Industry ◽  
Mineral Prospectivity ◽  
Efficient Exploration ◽  
Drill Holes

Major mineral discoveries have declined in recent decades, and the natural resource industry is in the process of adapting and incorporating novel technologies such as machine learning and artificial intelligence to help guide the next generation of exploration. One such development is an artificial intelligence architecture called VNet that uses deep learning and convolutional neural networks. This method is designed specifically for use with geoscience data and is suitable for a multitude of exploration applications. One such application is mineral prospectivity in which the machine is tasked with identifying the complex pattern between many layers of geoscience data and a particular commodity of interest, such as gold. The VNet algorithm is designed to recognize patterns at different spatial scales, which lends itself well to the mineral prospectivity problem of there often being local and regional trends that affect where mineralization occurs. We test this approach on an orogenic gold greenstone belt setting in the Canadian Arctic where the algorithm uses gold values from sparse drill holes for training purposes to predict gold mineralization elsewhere in the region. The prospectivity results highlight new target areas, and one such target was followed up with a direct-current induced polarization survey. A chargeability anomaly was discovered wherein the VNet had predicted gold mineralization, and subsequent drilling encountered a 6 g/t Au intercept within 10 m of drilling that averaged more than 1.0 g/t Au. Although most of the prospectivity targets generated from VNet were not drill tested, this first intercept helps validate the approach. We believe this method can help maximize the use of existing geoscience data for successful and efficient exploration programs in the future.

Deep structure of the Kayemraveem ore district (Chukotka) and features of epithermal gold-silver mineralization

2008 ◽  
Vol 421 (1) ◽  
pp. 755-759 ◽  
Author(s):  
A. A. Sidorov ◽  
Yu. Ya. Vashchilov ◽  
A. V. Volkov ◽  
V. F. Belyi
Keyword(s):  
Deep Structure ◽  
Epithermal Gold ◽  
Gold Silver ◽  
Silver Mineralization ◽  
Ore District

Pétrologie et gîtologie d'un filon-couche différencié et minéralisé archéen : le gisement aurifère Sigma-2, canton de Louvicourt, Québec

1991 ◽  
Vol 28 (11) ◽  
pp. 1731-1743 ◽  
Author(s):  
Réjean Hébert ◽  
Michel Rocheleau ◽  
Christine Giguère ◽  
Benoît Perrier ◽  
Roch Gaudreau
Keyword(s):  
Structural Feature ◽  
Gold Mineralization ◽  
Wall Rock ◽  
Coarse Grained ◽  
Fault System ◽  
Tectonic Event ◽  
The North ◽  
Geochemical Study ◽  
Main Fault ◽  
East West

The Archean Sigma-2 orebody is hosted in the felsic granophyric zone of the differentiated Vicour sill. The sill contains anomalous gold valves and is intrusive into the uppermost part of the Val-d'Or Formation. A geochemical study shows that the Vicour sill has evolved from a ferriferous tholeiitic melt and is comagmatic with the Héva Formation to the south. The competent granophyric zone has been affected by several ductile–brittle deformation events. Three systems of faults and fractures are recognized. Each of these systems is composed of two to three subsystems. The main fault system is oriented east–west with subvertical dip and has a dextral component of movement. Two east–west oriented fault subsystems, moderately dipping (45°) towards north and south, are associated with this feature. The second major structural feature consists of northeast and north-northwest conjugate fractures superimposed on structures of the first tectonic event. The shear movement is sinistral for the northeast fractures and dextral for the north-northwest fractures. The third structural feature is the most interesting with respect to gold mineralization. It consists of east–west-trending, moderately dipping fractures that could be genetically linked with the first structural feature and resulted from a northwest–southeast compression. These fractures increased the tectonic permeability of the granophyre, which allowed Cl- and Na-rich and Ca- and CO2-poor hydrothermal fluids to circulate through the rock and produced subhorizontal mineralized quartz lenses. The lenses are composed of quartz–tourmaline ± carbonate and of pyrite–pyrrhotite ± chalcopyrite. Arsenopyrite is observed in the bleached wall rock surrounding the lenses as well as in east–west faults and northeast and north-northwest conjugate fractures. Bleaching is the result of metasomatic sericitization, albitization, silicification, and low carbonatization of the wall rock and decreases away from the mineralized lenses. Gold is associated with pyrite and arsenopyrite and occurs as inclusions and veinlets crosscutting sulfide grains. It was deposited at a late stage along with quartz and, locally, chalcopyrite. Metasomatism was responsible for the formation of arsenopyrite, coarse-grained pyrite, pyrrhotite, and chalcopyrite while ilmenite recrystallized in the veins. Fractures within arsenopyrite and pyrite are filled with late deposits of pyrrhotite and chalcopyrite. The tholeiitic composition and anomalous gold values of the mafic section of the sill could be additional valuable guidelines in the exploration for similar orebodies.

scholarly journals THE VETROVAYAM VOLCANIC ROCKS AND THEIR ORE DISTRICT (SOUTH-WESTERN PART OF THE SOUTH-ESTERN KORYAK BELT)

2018 ◽  
Author(s):  
Г.П. Яроцкий ◽  
Х.О. Чотчаев
Keyword(s):  
Seismic Hazard ◽  
Volcanic Rock ◽  
Transition Zone ◽  
Gold Mining ◽  
Volcanic Rocks ◽  
Mining Company ◽  
Lode Gold ◽  
Gold Silver ◽  
Orogenic Belts ◽  
Ore District

В Корякском нагорье ярко проявлен прирост континента рядом вулканических северо-восточных орогенных поясов. Они лежат в Морской транзитали литосферы южной окраины СВ Азии и вмещают золото, серебро, самородную серу, медь. Пояса обособлены по простиранию отдельными вулканогенами, которые являются тектоно-магматическим субстратом рудных таксонов. Описан Ветроваямский вулканоген с его элементами системы «тектоника-минерагения» рудного Ильпинского района. Доказано положение вулканогена на тектоническом своде воздымающейся глыбы литосферы, заключённой поперечными межглыбовыми разломами. К востоку от вулканогена лежит территория сильных землетрясений Хаилинского и Олюторского (1991 и 2006 гг.), что определяет вероятную сейсмоопасность для возникающего в районе горнодобывающего предприятия по добыче рудного золота. Certain NE volcanic orogenic belts have contributed into emergence within the Koryak highlands. They are located in the sea transition zone of the lithosphere within the southern margin of NE Asia and host gold, silver, native sulphur, and copper. The belts are isolated along the strike by certain volcanic rocks that are tectonic-magmatic substance for ore taxons. The article describes the Vetrovayam volcanic rocks with their elements of tectonic-minerageny system in the Ilpinsky ore district. The paper provides evidence that the volcanic rocks are located on the arch of rising lithospheric block enclosed by transversal interblock faults. East of the volcanic rock there is a zone of the strong 1991 Khailinsky and 2006 Olyotorsky earthquakes, which allows to suppose probable seismic hazard to developing lode gold mining company constructed in that zone

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