High Waste Rock Dumps — Challenges and Developments

Valenzuela, Luis; Bard, Edgar; Campaña, José; Anabalón, María Eugenia

doi:10.36487/acg_repo/802_6

Cited by 15 publications

(13 citation statements)

References 2 publications

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“…The mining industry generates large amounts of loose uncompacted granular materials, such as ore stockpiles and mine waste rock dumps that can reach several hundred meter high 1–4 . Physical stability of these large structures must be verified all through engineering designs, because any mass sliding could significantly affect the environment and the mining operation 5,6 .…”

Section: Introductionmentioning

confidence: 99%

Effects of particle size‐shape correlations on steady shear strength of granular materials: The case of particle elongation

Carrasco

Cantor

Ovalle

2022

Num Anal Meth Geomechanics

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Granular materials often present correlations between particle size and shape due to their geological formation and mechanisms of weathering and fragmentation. It is known that particle shape strongly affects shear strength. However, the effects of shape can be modified by the role the particle plays in a sample given its size. We explore the steady shear strength of samples composed of particles presenting size‐shape correlations and we focus on the case of particle elongation in two opposite scenarios: (A) large elongated grains with finer circular grains and (B) large circular grains with elongated finer grains. By means of numerical simulations, we probe the shear strength of samples of varying particle size span from mono to highly polydisperse and particle aspect ratios varying between 1 and 5. We find that the two correlations tested strongly impact the shear strength as particle size span evolves. Microstructural analyzes allow us to identify how each correlation affects connectivity and anisotropies linked to the orientation of the particles and load transmission. Decompositions of the stress tensor let us identify the sources of the different mechanical behavior in each correlation and determine the contributions of each particle shape to macroscopic shear strength. This study proves that common small‐scaling methods based on truncated or parallel particle size distributions can incur in under/over‐estimations of shear strength if particle shapes are not considered in the scaling process.

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Section: Introductionmentioning

confidence: 99%

Effects of particle size‐shape correlations on steady shear strength of granular materials: The case of particle elongation

Carrasco

Cantor

Ovalle

2022

Num Anal Meth Geomechanics

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“…Images are available in colour online. (Marsal et al 1965;Valenzuela et al 2008;Palma et al 2009). In general terms, the compressibility depends mainly on whether the initial block size distribution is uniform or well graded and whether it is initially loose or tight.…”

Section: Differentiating Bod In the Imzmentioning

confidence: 98%

“…This represents a key hypothesis promoted in this study as the vertical and horizontal stresses acting within the draw column are indeed variables during the draw process. Valuable data on large 1-D compression tests was compiled for this study from several sources as shown in Figure 11 (Marsal et al 1965; Valenzuela et al 2008; Palma et al 2009). In general terms, the compressibility depends mainly on whether the initial block size distribution is uniform or well graded and whether it is initially loose or tight.…”

Section: Framework and Key Attributes For Assessing Bodmentioning

confidence: 99%

Procedure for estimating broken ore density distribution within a draw column during block caving

Dorador,

Eberhardt,

Elmo

2021

Mining Technology: Transactions of the Institutions of Mining a

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Broken ore density (BOD) is an important parameter in planning a block cave mine. However, its assessment is complicated by the heterogeneous nature of its distribution within a draw column, varying from a denser central plug-flow zone and decreasing outwards towards outer perimeter shear bands. The BOD further decreases immediately above the drawpoint due to the development of a loosening zone that develops in response to mucking. This makes determining BOD a challenging task, hindered by the inability to measure it in situ. To address this, several key factors influencing BOD are investigated including the influence of primary and secondary fragmentation, air gap thickness, draw rate and column height. Data is used to link primary and secondary fragmentation to broken ore size distributions. From these, a conceptual framework and empirical procedures are presented for evaluating BOD within draw columns during block caving for feasibility and early stage mine planning and design.

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“…Las grandes alturas que alcanzan los depósitos de roca estéril generan altas presiones de confinamiento, induciendo la rotura de partículas en estos materiales (Bard et al, 2007;Valenzuela et al, 2008). Para los diferentes materiales y distribuciones granulométricas analizados en laboratorio, se observó que la rotura de partículas fue más significativa en los granos más gruesos, dado que estos presentan menos puntos de contacto entre sí, lo que genera mayores esfuerzos en estos puntos.…”

Section: Rotura De Partículasunclassified

Escalamiento geométrico de la curva granulométrica de materiales granulares provenientes de actividades mineras

Sanabria¹,

Jaime²

2022

Obras y Proyectos

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La extracción de minerales en operaciones mineras comprende la remoción de material estéril, así como, el traslado y disposición de estas en depósitos destinados para su almacenamiento de forma temporal o permanente. Estos depósitos conocidos como botaderos de desmonte, vertederos o tepetateras de roca estéril, comprenden materiales que por su tamaño y forma de disposición no pueden ser analizados en laboratorio y en campo, para obtener parámetros de resistencia al corte, compresibilidad y permeabilidad, con el objetivo de realizar diseños o evaluaciones de estabilidad física. El desarrollo y construcción de equipos a gran escala permite analizar especímenes de mayor tamaño, pero su disponibilidad es escasa. Actualmente, se cuenta con diversas metodologías que permiten reducir los tamaños de partículas para que sean ensayados en equipos de menor escala o convencionales. Entre los métodos desarrollados se tiene el

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High Waste Rock Dumps — Challenges and Developments

Cited by 15 publications

References 2 publications

Effects of particle size‐shape correlations on steady shear strength of granular materials: The case of particle elongation

Effects of particle size‐shape correlations on steady shear strength of granular materials: The case of particle elongation

Procedure for estimating broken ore density distribution within a draw column during block caving

Escalamiento geométrico de la curva granulométrica de materiales granulares provenientes de actividades mineras

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