scholarly journals Integration of Dual Border Effects in Resource Estimation: A Cokriging Practice on a Copper Porphyry Deposit

Minerals ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 660
Author(s):  
Nasser Madani ◽  
Mohammad Maleki ◽  
Fatemeh Sepidbar
Keyword(s):  
Continuous Variable ◽  
Indicator Kriging ◽  
Smoothing Effect ◽  
Resource Estimation ◽  
Border Effect ◽  
Block Model ◽  
Porphyry Deposit ◽  
Geological Interpretation ◽  
Copper Porphyry ◽  
Final Block

Hierarchical or cascade resource estimation is a very common practice when building a geological block model in metalliferous deposits. One option for this is to model the geological domains by indicator kriging and then to estimate (by kriging) the grade of interest within the built geodomains. There are three problems regarding this. The first is that sometimes the molded geological domains are spotty and fragmented and, thus, far from the geological interpretation. The second is that the resulting estimated grades highly suffer from a smoothing effect. The third is related to the border effect of the continuous variable across the boundary of geological domains. The latter means that the final block model of the grade shows a very abrupt transition when crossing the border of two adjacent geological domains. This characteristic of the border effect may not be always true, and it is plausible that some of the variables show smooth or soft boundaries. The case is even more complicated when there is a mixture of hard and soft boundaries. A solution is provided in this paper to employ a cokriging paradigm for jointly modeling grade and geological domains. The results of modeling the copper in an Iranian copper porphyry deposit through the proposed approach illustrates that the method is not only capable of handling the mixture of hard and soft boundaries, but it also produces models that are less influenced by the smoothing effect. These results are compared to an independent kriging, where each variable is modeled separately, irrespective of the influence of geological domains.

scholarly journals Platinum mineralization comparative characteristics of the some Far East deposits

2018 ◽  
Vol 56 ◽  
pp. 04017
Author(s):  
Natalya Lavrik ◽  
Natalya Litvinova ◽  
Tatyana Aleksandrova ◽  
Valentina Stepanova ◽  
Alexandra Lavrik
Keyword(s):  
Far East ◽  
Manganese Ore ◽  
Gold Content ◽  
Alternative Source ◽  
Porphyry Deposit ◽  
Copper Porphyry ◽  
Native Silver ◽  
Iron Manganese ◽  
Platinum Mineralization

In this article shown platinum mineralization comparative characteristics for three deposits: Kondoer-traditional unique deposit and other two probably alternative source of platinum: the Poperechnoe ironmanganese deposit and the Malmyzh copper-porphyry deposit. Platinoids of the Kondoer deposit are the chain Pt>>Ir>Os>Ru=Rh>Pd. The presences of platinum crystals are characteristic, there are over 50 rare and new platinoids minerals in different combinations. There are gold and silver. Platinoids from the iron-manganese ore of Poperechnoe are as Pt>>Rh≈Ir>Ru≈Os>Pd. A scattered dissemination of arsenide sulfate and sulfides of Rh, Ir, Ru, Os are noted in the platinum. Palladium is present as impurities in gold and platinum. The gold content is different-with admixtures Ag, Pb, Cd, Fe. At this stage the platinoids content in oxidized ores of the Malmyzh gold-copper porphyry deposit is Pt ≈ Pd. The gold is present as electrum. There is native silver cadmium.

scholarly journals Minerals of oxidation zone of the Elenovskoe copper porphyry deposit, South Urals

2019 ◽  
Vol 5 ◽  
pp. 37-48
Author(s):  
I.A. Blinov
Keyword(s):  
Mineral Assemblage ◽  
Oxidation Zone ◽  
South Urals ◽  
Scanning Electronic Microscopy ◽  
Electronic Microscopy ◽  
Porphyry Deposit ◽  
Copper Porphyry

Samples of oxidation zone of the Elenovskoe Cu porphyry deposit are studied using optical and scanning electronic microscopy. In addition to Fe hydroxides and abundant malachite, the supergene mineral assemblage includes native Cu and Au, Ag-containing covellite, cuprite, tenorite, plumbogummite, goyazite, iodargyrite, atacamite, and chrysocolla. The oxidized ores contains pyrite relics and high amount of tourmaline (dravite). Some dravite grains contain Cu.

Distribution of gold in a copper porphyry deposit, Almalyk region

1973 ◽  
Vol 15 (6) ◽  
pp. 660-663 ◽  
Author(s):  
Ye.Z. Meshchaninov ◽  
V.N. Azin
Keyword(s):  
Porphyry Deposit ◽  
Copper Porphyry

scholarly journals Gold- and Silver-Bearing Assemblages in the Ann-Mason Copper Porphyry Deposit, Yerington, Nevada

2021 ◽  
pp. 104339
Author(s):  
Hannah M. Aird ◽  
Ceara K. Purcell ◽  
Nancy DeWitt ◽  
James Matthews ◽  
Twyla Capurro ◽  
...  
Keyword(s):  
Porphyry Deposit ◽  
Copper Porphyry

scholarly journals Application of geostatistics to complete uranium resources estimation of Rabau Hulu Sector, Kalan, West Kalimantan

2020 ◽  
Vol 200 ◽  
pp. 06001
Author(s):  
Roni Ciputra ◽  
Suharji Suharji ◽  
Dhatu Kamajati ◽  
Heri Syaeful
Keyword(s):  
3D Modeling ◽  
Gamma Ray ◽  
Block Size ◽  
Mine Planning ◽  
Resource Estimation ◽  
Block Model ◽  
West Kalimantan ◽  
Geostatistical Estimation ◽  
Uranium Exploration ◽  
Minimum Block

Kalan is one of the focus areas for uranium exploration in West Borneo that conducted by BATAN. Situated in the central part of Kalan, previous works in Rabau Hulu Sector consisted of surface geology and radiometric anomaly mapping, trenching, drilling, logging, and conventional uranium resource estimation. Nevertheless, the complete resource estimation of the previous work was still using 2D modeling, and the latest one using 3D modeling is a method-application case study in one orebody. To increase the confidence level and completing the uranium resource estimation of all orebodies in this sector, a geostatistical estimation with 3D orebody modeling using SURPAC mine planning software was conducted in this paper. Gamma-ray log data from 32 drill holes were collected and then interpreted to obtain uranium grade-thickness data. Based on the correlation of grade-thickness data according to surface orebody orientation, the orebody 3D modeling was done. It resulted in 26 orebodies with one control system of lithology as the mineralization only taken place in the quartzite unit. This 3D model then used as a constraint for block model with 4x4x2 m block size and 0.25x0.25x0.125 m minimum block size. Block model calculation was performed using ordinary kriging which generated the kriging efficiency attribute for the determination of the resource category. Within 25 meters searching radius, the calculation resulted in 408, 480 tons of ore, while total uranium resource was 268 tons of uranium with 677 ppm average grade. There were 214 tons of uranium (79%) categorized as measured while the other 54 tons of uranium (21%) categorized as indicated.

scholarly journals Assessing physical and mechanical properties of enclosing rock in the course of Malmyzhskoe gold-copper-porphyry deposit development

2021 ◽  
Vol 1 (3) ◽  
pp. 48-59
Author(s):  
Denis I. Tsoi
Keyword(s):  
Mechanical Properties ◽  
Physical And Mechanical Properties ◽  
Local Area ◽  
Structural Features ◽  
Strength Properties ◽  
Petrographic Analysis ◽  
Porphyry Deposit ◽  
Copper Porphyry ◽  
Host Rocks ◽  
Enclosing Rocks

Introduction. This work presents the results of complex technological and mineralogical studies. It has been discovered that some natural rocks are characterized by physical and mechanical properties variability 58 "Izvestiya vysshikh uchebnykh zavedenii. Gornyi zhurnal". No. 3. 2021 ISSN 0536-1028 even within a local area. It must be taken into account when assessing enclosing rocks utilization options. The results of Malmyzhskoye rock physical and mechanical properties study at the stage of geological exploration are considered. Research aim is to carry out integrated technological and mineralogical research and laboratory tests on rock physical and mechanical properties to assess the feasibility of using hard enclosing rock for construction. Research methodology. The geological and structural features of the field were established by comparative analysis of geological sections and maps, structural documentation of the core. In laboratory conditions, the physical and mechanical properties of the host rocks that make up the gold-copper-porphyry deposit were established. Results. After studying the mineral (chemical) composition and physical and mechanical properties of rocks, it was possible to obtain the dependence of the strength index on the structure, as well as on the content of dark-colored minerals and plagioclases. At the same time, there are no significant correlations between strength and density within the same rock type. Conclusions. The analysis shows that rocks with the same mineral composition and equal values of the true density, but with different texture and structure, show differences in strength properties. Keywords: Malmyzhskoe deposit; breakability; physical and mechanical properties; rocks; petrographic analysis; density; strength.

scholarly journals Engineering and geological zoning of the Malmyzhsky deposit weathering crusts (Svoboda area)

2021 ◽  
Vol 1 ◽  
pp. 53-63
Author(s):  
Tatiana S. Bobina ◽  
Keyword(s):  
Mechanical Properties ◽  
Physical And Mechanical Properties ◽  
Weathering Crust ◽  
Alluvial Deposits ◽  
Porphyry Deposit ◽  
Geochemical Zoning ◽  
Copper Porphyry ◽  
Geological Conditions ◽  
Weathering Crusts ◽  
Mine Development

Introduction. Interest in the study of weathering crusts arose at a time when geological engineers faced the problem of developing open pits formed by eluvial soils. However, the exact and detailed division of the weathering crusts into engineering-geological zones, especially when studying mineral deposits, is not given due attention even today. Therefore, in the course of prospecting, it is important to correctly determine weathering crust type and profile, and establish the possibility of changing the engineering and geological conditions when opening the rock mass by mine workings for further slope stability prediction of the designed mining structures. Research aim is to determine vertical engineering-geological zoning of the Malmyzhsky deposit weathering crusts (Svoboda area) and identify patterns in alluvial deposits physical and mechanical properties change, which define the safety of mine development. Methodology. A significant number of Russian and foreign scientists have considered the formation of weathering crusts from different positions. They established the geochemical zoning and engineeringgeological zoning of the weathering crusts. Results. The article describes the Svoboda area at the Malmyzhsky gold-copper-porphyry deposit. Engineering and geological zoning of the weathering crust section was carried out according to a set of features, including structural and textural features, mineral composition, physical and mechanical properties of rocks. Within it, three zones are identified at the Malmyzhsky field, the Svoboda area: IV – dispersed, III – litomarge, and II – clastic. Physical and mechanical properties of rock building up the considered weathering crust have been analyzed proving that change in geological conditions within even one zone of the Malmyzhsky gold-copper-porphyry deposit (Svoboda area) entails a change in the choice of projected pit wall angles.

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