Peter A. Dowd
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View article: A simplified relationship between the zero-percolation threshold and fracture set properties
A simplified relationship between the zero-percolation threshold and fracture set properties Open
Percolation analysis is an efficient way of evaluating the connectivity of discrete fracture networks. Except for very simple cases, it is not feasible to use analytical approaches to find the percolation threshold of a discrete fracture n…
View article: A Simplified Relationship Between the Zero-percolation Threshold and Fracture Set Properties
A Simplified Relationship Between the Zero-percolation Threshold and Fracture Set Properties Open
Percolation analysis is an efficient way of evaluating the connectivity of discrete fracture networks. Except for very simple cases, it is not feasible to use analytical approaches to find the percolation threshold of a discrete fracture n…
View article: Pluri-Gaussian rapid updating of geological domains
Pluri-Gaussian rapid updating of geological domains Open
Over the past decade, the rapid updating of resource knowledge and the integration of real-time sensor information have gained attention in both industry and academia. However, most studies on rapid resource model updating have focused on …
View article: A code for the 2D simulation of the steady-state fluid flow in porous blocks containing transmissive fractures
A code for the 2D simulation of the steady-state fluid flow in porous blocks containing transmissive fractures Open
Modelling fluid flow through a porous rock mass containing fractures is a common issue in many applications in civil engineering, mining engineering, and extraction of energy resources such as petroleum, gas, and geothermal heat. Fractures…
View article: Rapid Updating of Multivariate Resource Models Based on New Information Using EnKF-MDA and Multi-Gaussian Transformation
Rapid Updating of Multivariate Resource Models Based on New Information Using EnKF-MDA and Multi-Gaussian Transformation Open
Rapid resource model updating with real-time data is important for making timely decisions in resource management and mining operations. This requires optimal merging of models and observations, which can be achieved through data assimilat…
View article: Description of an emblematic geosite in Central Spain: A large sinkhole associated with paleo-landslide in gypsum karst
Description of an emblematic geosite in Central Spain: A large sinkhole associated with paleo-landslide in gypsum karst Open
Emblematic geosites are those that introduce a new geological concept or strikingly display a well-known geological concept. In this context we introduce and describe a large sinkhole in Central Spain as an emblematic geosite due to the fo…
View article: Exploring digital twin systems in mining operations: A review
Exploring digital twin systems in mining operations: A review Open
Constant attempts have been made throughout human history to find solutions to complex issues. These attempts resulted in industrial revolutions and the transition from manual labor to machines and new technologies. The latest advancements…
View article: Inference of the Gutenberg-Richter b-value: New insights and results
Inference of the Gutenberg-Richter b-value: New insights and results Open
The size-frequency distribution of many geological and geophysical variables, in relation to fractures, faulting and seismicity, is well described by a statistical distribution of the power law type which is characterized by its exponent. …
View article: Numerical Investigation of the Applicability of Preferential Grade Deportment by Size
Numerical Investigation of the Applicability of Preferential Grade Deportment by Size Open
The effective separation of ore is based on two fundamental processes: liberation and separability. Liberation involves the reduction of size, yielding smaller particles with enhanced compositional homogeneity. Understanding liberation req…
View article: The Spatio-Temporal Dynamics of Water Resources (Rainfall and Snow) in the Sierra Nevada Mountain Range (Southern Spain)
The Spatio-Temporal Dynamics of Water Resources (Rainfall and Snow) in the Sierra Nevada Mountain Range (Southern Spain) Open
This paper describes the use of a unique spatio-temporally resolved precipitation and temperature dataset to assess the spatio-temporal dynamics of water resources over a period of almost seven decades across the Sierra Nevada mountain ran…
View article: The Many Forms of Co-kriging: A Diversity of Multivariate Spatial Estimators
The Many Forms of Co-kriging: A Diversity of Multivariate Spatial Estimators Open
In this expository review paper, we show that co-kriging, a widely used geostatistical multivariate optimal linear estimator, has a diverse range of extensions that we have collected and illustrated to show the potential of this spatial in…
View article: Assessing Terrestrial Water Storage Variations in Southern Spain Using Rainfall Estimates and GRACE Data
Assessing Terrestrial Water Storage Variations in Southern Spain Using Rainfall Estimates and GRACE Data Open
This paper investigates the relationship between rainfall, groundwater and Gravity Recovery and Climate Experiment (GRACE) data to generate regional-scale estimates of terrestrial water storage variations in the Andalucía region of souther…
View article: A numerical sensitivity study – The effectiveness of RFID-based ore tracking through a simulated coarse ore stockpile and the impacts of key process variables
A numerical sensitivity study – The effectiveness of RFID-based ore tracking through a simulated coarse ore stockpile and the impacts of key process variables Open
The ability to understand ore characteristics in real-time during mining processes is vital for ensuring product quality control. However, it is challenging to continuously track ore flow from the mine to the mill due to the blending of or…
View article: Geometallurgical Responses on Lithological Domains Modelled by a Hybrid Domaining Framework
Geometallurgical Responses on Lithological Domains Modelled by a Hybrid Domaining Framework Open
Identifying mineralization zones is a critical component of quantifying the distribution of target minerals using well-established mineral resource estimation techniques. Domains are used to define these zones and can be modelled using tec…
View article: Geostatistics in the Presence of Multivariate Complexities: Comparison of Multi-Gaussian Transforms
Geostatistics in the Presence of Multivariate Complexities: Comparison of Multi-Gaussian Transforms Open
One of the most challenging aspects of multivariate geostatistics is dealing with complex relationships between variables. Geostatistical co-simulation and spatial decorrelation methods, commonly used for modelling multiple variables, are …
View article: A hybrid framework for modelling domains using quantitative covariates
A hybrid framework for modelling domains using quantitative covariates Open
Domains define the boundaries of mineralisation zones, within which the grade distribution of the target minerals can be quantified via an established mineral resource estimation procedure. Available domain modelling techniques include man…
View article: A Review of Sensor-Based Sorting in Mineral Processing: The Potential Benefits of Sensor Fusion
A Review of Sensor-Based Sorting in Mineral Processing: The Potential Benefits of Sensor Fusion Open
Sensor-based sorting techniques offer the potential to improve ore grades and reduce the amount of waste material processed. Previous studies show that sensor-based sorting can reduce energy, water and reagent consumption and fine waste pr…
View article: Geostatistics in the presence of multivariate complexities: comparison of multi-Gaussian transforms
Geostatistics in the presence of multivariate complexities: comparison of multi-Gaussian transforms Open
One of the most challenging aspects of multivariate geostatistics is dealing with complex relationships between variables. Geostatistical co-simulation and spatial decorrelation methods, commonly used for modelling multiple variables, are …
View article: Evaluation of multivariate Gaussian transforms for geostatistical applications
Evaluation of multivariate Gaussian transforms for geostatistical applications Open
Traditional geostatistical simulation techniques rely on the assumption of multi-Gaussianity. Although the normal score transform is widely used to convert data to a Gaussian distribution, it only guarantees that the normal scores will be …
View article: Geodiversity of closed depressions in a high relief karst: Geoeducation asset and geotourism resource in the "Sierra de las Nieves" National Park (Málaga Province, Southern Spain)
Geodiversity of closed depressions in a high relief karst: Geoeducation asset and geotourism resource in the "Sierra de las Nieves" National Park (Málaga Province, Southern Spain) Open
Closed depressions are scale-invariant landforms that are the most distinctive and characteristic landform in karst terrains at the millimetre-to-kilometre scales. The purpose of this paper is twofold. The first is to raise awareness of th…
View article: Modelling of Coupled Hydro-Thermo-Chemical Fluid Flow through Rock Fracture Networks and Its Applications
Modelling of Coupled Hydro-Thermo-Chemical Fluid Flow through Rock Fracture Networks and Its Applications Open
Most rock masses contain natural fractures. In many engineering applications, a detailed understanding of the characteristics of fluid flow through a fractured rock mass is critically important for design, performance analysis, and uncerta…
View article: Stochastic Simulation of the Spatial Heterogeneity of Deltaic Hydrofacies Accounting for the Uncertainty of Facies Proportions
Stochastic Simulation of the Spatial Heterogeneity of Deltaic Hydrofacies Accounting for the Uncertainty of Facies Proportions Open
The spatial geological heterogeneity of an aquifer significantly affects groundwater storage, flow and the transport of solutes. In the particular case of coastal aquifers, spatial geological heterogeneity is also a major determining facto…
View article: Non-parametric three-dimensional discrete fracture network modelling from fracture mapping data
Non-parametric three-dimensional discrete fracture network modelling from fracture mapping data Open
Rock masses usually include discontinuities in the form of fractures or joints, which in general are critical in determining the mechanical or flow properties of the rock mass at the engineering scale. Recent advances in computing power ha…