Segmentation of ore and waste rocks in borehole images using the multi-module densely connected U-net

2021 ◽  
pp. 105018
Author(s):  
Changyu Jin ◽  
Kai Wang ◽  
Tao Han ◽  
Yu Lu ◽  
Aixin Liu ◽  
...  
Keyword(s):  
Waste Rocks

scholarly journals In Vivo X-ray Computed Tomography Investigations of Crack Damage Evolution of Cemented Waste Rock Backfills (CWRB) under Uniaxial Deformation

Minerals ◽  
2018 ◽  
Vol 8 (11) ◽  
pp. 539 ◽  
Author(s):  
Yu Wang ◽  
Changhong Li ◽  
Zhiqiang Hou ◽  
Xuefeng Yi ◽  
Xiaoming Wei
Keyword(s):  
Computed Tomography ◽  
Damage Evolution ◽  
Waste Rock ◽  
Crack Identification ◽  
Mining Operations ◽  
Cracking Behavior ◽  
Value Analysis ◽  
X Ray ◽  
Waste Rocks ◽  
X Ray Computed

Cemented waste rock backfill (CWRB), which is a mixture of tailings, waste rock, cement, and water, is subjected to combination actions in underground mining operations and has been widely used in deep resource mining. While the strength requirement and macroscopic deformation behaviors of CWRB have been well studied, the mesoscopic damage evolution mechanisms are still not well understood. In this work, a CWRB sample with a waste rock proportion of 30% was studied with a uniaxial compression test under tomographic monitoring, using a 450 kV industrial X-ray computed tomography (CT). Clear CT images, CT value analysis, crack identification, and extraction reveal that CWRB damage evolution is extremely inhomogeneous and affected by the waste rock size, shape, and distribution. Furthermore, the crack initiation, propagation, and coalescence behaviors are limited to the existing waste rocks. When deformation grows to a certain extent, the cracks demonstrate an interlocking phenomenon and their propagation paths are affected by the waste rocks, which may improve the ability to resist compressive deformation. Volumetric dilatancy caused by the damage and cracking behavior has closed a link with the meso-structural changes, which are controlled by the interactions between the waste rocks and the cemented tailing paste.

scholarly journals Methodology for selection of the variant for opening the deeper parts of the Toranica mine

2021 ◽  
pp. 1-13
Author(s):  
Zoran Despodov ◽  
Nikolinka Doneva ◽  
Stojanče Mijalkovski ◽  
Marija Hadži-Nikolova
Keyword(s):  
Underground Mine ◽  
Ore Deposit ◽  
Optimal Variant ◽  
Waste Rocks ◽  
Lead Zinc ◽  
Selection Of

Opening an underground mine or part of it presents complex and responsible issue, which affects the economy and effectiveness of the mine operation. This paper presents a methodology for selecting the optimal variant for opening, the lead-zinc ore mine Toranica, Macedonia. Six variants of opening and haulage of ore and waste rocks in the deeper parts of the ore deposit have been considered. After the performed analysis, the optimal variant for opening and haulage for the Toranica mine was determined.

Petrographic Characterization of Waste Rocks: Applicability as Concrete Aggregates

2018 ◽  
pp. 67-72
Author(s):  
Maria del Pilar Durante Ingunza ◽  
Antonio Carlos Galindo ◽  
Ana Beatriz Azevedo de Medeiros
Keyword(s):  
Concrete Aggregates ◽  
Waste Rocks

Valorization of phosphate mine waste rocks as aggregates for concrete

2020 ◽  
Author(s):  
A. El Machi ◽  
S. Mabroum ◽  
Y. Taha ◽  
A. Tagnit-Hamou ◽  
M. Benzaazoua ◽  
...  
Keyword(s):  
Mine Waste ◽  
Phosphate Mine ◽  
Waste Rocks

scholarly journals Competitive Growth of Sulfate-Reducing Bacteria with Bioleaching Acidophiles for Bioremediation of Heap Bioleaching Residue

2020 ◽  
Vol 17 (8) ◽  
pp. 2715 ◽  
Author(s):  
Aung Kyaw Phyo ◽  
Yan Jia ◽  
Qiaoyi Tan ◽  
Heyun Sun ◽  
Yunfeng Liu ◽  
...  
Keyword(s):  
Organic Matter ◽  
Acid Mine Drainage ◽  
Mine Drainage ◽  
Sulfate Reducing Bacteria ◽  
Sulfide Minerals ◽  
Sulfate Reducing ◽  
Heap Bioleaching ◽  
Waste Rocks ◽  
Sulfur Oxidizing ◽  
Reducing Bacteria

Mining waste rocks containing sulfide minerals naturally provide the habitat for iron- and sulfur-oxidizing microbes, and they accelerate the generation of acid mine drainage (AMD) by promoting the oxidation of sulfide minerals. Sulfate-reducing bacteria (SRB) are sometimes employed to treat the AMD solution by microbial-induced metal sulfide precipitation. It was attempted for the first time to grow SRB directly in the pyritic heap bioleaching residue to compete with the local iron- and sulfur-oxidizing microbes. The acidic SRB and iron-reducing microbes were cultured at pH 2.0 and 3.0. After it was applied to the acidic heap bioleaching residue, it showed that the elevated pH and the organic matter was important for them to compete with the local bioleaching acidophiles. The incubation with the addition of organic matter promoted the growth of SRB and iron-reducing microbes to inhibit the iron- and sulfur-oxidizing microbes, especially organic matter together with some lime. Under the growth of the SRB and iron-reducing microbes, pH increased from acidic to nearly neutral, the Eh also decreased, and the metal, precipitated together with the microbial-generated sulfide, resulted in very low Cu in the residue pore solution. These results prove the inhibition of acid mine drainage directly in situ of the pyritic waste rocks by the promotion of the growth of SRB and iron-reducing microbes to compete with local iron and sulfur-oxidizing microbes, which can be used for the source control of AMD from the sulfidic waste rocks and the final remediation.

Use of flint from phosphate mine waste rocks as an alternative aggregates for concrete

2021 ◽  
Vol 271 ◽  
pp. 121886
Author(s):  
Aiman El Machi ◽  
Safaa Mabroum ◽  
Yassine Taha ◽  
Arezki Tagnit-Hamou ◽  
Mostafa Benzaazoua ◽  
...  
Keyword(s):  
Mine Waste ◽  
Phosphate Mine ◽  
Waste Rocks

scholarly journals Decreasing Mining Losses for the Room and Pillar Method by Replacing the Inter-Room Pillars by the Construction of Wooden Cribs Filled with Waste Rocks

Energies ◽  
2020 ◽  
Vol 13 (14) ◽  
pp. 3564 ◽  
Author(s):  
Krzysztof Skrzypkowski
Keyword(s):  
Underground Mining ◽  
Second Stage ◽  
Ore Body ◽  
Strength Tests ◽  
Waste Rocks ◽  
Rock Pillars ◽  
First Time ◽  
Numerical Program ◽  
Vertical Deformations ◽  
Maximal Capacity

The article presents methods of securing mining excavations using wooden cribs. For the underground room and pillar method used to excavate zinc and lead ore body in the Olkusz-Pomorzany mine in Poland, model tests for the replacement of rock pillars by wooden cribs are presented. In the first stage of research, the results of laboratory strength tests carried out on models of four-point, six-point and eight-point cribs made of wooden beech beams at a 1:28 scale arranged horizontally were determined. For the first time, a concave round notch connection was used to connect the beams of the wooden cribs. The maximal capacity of cribs consisting only of beams and filled with waste rocks taken from underground mining excavations was determined. In addition, the vertical deformations of the cribs at maximal loading force and their specific deformations are presented. Additionally, on the basis of load-displacement characteristics, the range in variability of the stiffness of empty cribs and those filled with waste rocks was calculated as a function of their compressibility. In the second stage of research, the room and pillar method was designed in the Phase2 numerical program. The aim of the study was to determine the stresses in the inter-room pillars. Based on the results of laboratory and numerical tests, a factor of safety was determined, indicating that it is possible to reduce mining losses while maintaining the safe exploitation conditions of the ore body.

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