Mohd Hazizan Mohd Hashim

Universiti Sains Malaysia | USM ·  School of Material and Mineral Resources Engineering

The exposure to respirable crystalline silica found in granite dust presents significant health hazards to quarry workers and nearby communities, including silicosis and various respiratory ailments. This study evaluates the efficacy of various pollution control measures implemented in granite quarries. It aimed to provide a comprehensive critical...

Purpose. Surface water from mining activities may undergo various physico-chemical changes that can impact its quality and ecological health. This study conducted a comprehensive physico-chemical assessment of surface water affected by mining operations, with a particular emphasis on heavy metal content. Methods. These parameters were chosen due to...

This study investigated the effect of rock-water interaction on microstructural properties of various weathering grade sandstone. Sandstone samples were acquired from the Sor-Range coal mine area, Pakistan, and were investigated using a tabletop scanning electron microscope (SEM). The characteristics of microstructures from micrographs were obtaine...

Purpose. To develop comprehensive models for predicting the pH and electrical conductivity of surface water in Maiganga coal mine and environs affected by mining activities. Methodology. The research utilizes a combination of in-situ measurement, laboratory analysis, modeling technique using Ansys Workbench and Linear Regression for predicting the...

Sustainability is one of the most challenging concepts in the global mining industry. The purpose of this is to limit the harmful effects of mineral extraction on the environment and at the same time to meet the present and future needs of civilization. Therefore, we should blaze the path leading to sustainability and supply security, as well as id...

Blasting has been adjudged as the cheapest method of hard rock fragmentation. The itinerary of rock breakage through blasting in open pit mines is a complex portent which is measured via various variables and parameters. This research investigates the impact of short burden and spacing on blasting output with the aim of establishing a more suitable...

The weathering-induced changes contribute significant alteration to mechanical and failure characteristics in the rock matrix. It is crucial to evaluate the rock fracture characteristics and mechanical response under different weathering grades because prestressing rock is extremely susceptible to the effects of weathering. Consequently, this study...

The rocks in the studied area are prone to deterioration and failure due to frequent exposure to extreme temperature variations and loading conditions. In the context of rock engineering reliability assessment, understanding the energy conversion process in rocks is critical. Therefore, this research work aims to assess the energy characteristics a...

It is significant to monitor the leakage at the joints of the diaphragm walls of subway station foundation pits to check the weak links in the waterproof quality of the diaphragm wall structure. It is essential to take effective waterproof measurements timely to improve the overall waterproof quality of the diaphragm wall in the foundation pit to p...

The major factors affecting tunnel stability include the ground conditions, in-situ stresses, and project-related features. In this research work, critical strain, stress reduction factor (SRF), and capacity diagrams are used for tunnel stability analysis. For this purpose, eighteen tunnel sections are modelled using the FLAC2D software. The rock m...

Support design is the main goal of the Q and rock mass rating (RMR) systems. An assessment of the Q and RMR system application in tunnelling involving high-stress ground conditions shows that the first system is more appropriate due to the stress reduction factor. Recently, these two systems have been empirically modified for designing the excavati...

Uniaxial compressive strength (UCS) and the static Young’s modulus (Es) are fundamental parameters for the effective design of engineering structures in a rock mass environment. Determining these two parameters in the laboratory is time-consuming and costly, and the results may be inappropriate if the testing process is not properly executed. There...

This paper evaluates the variation and relationship of Brazilian tensile strength and fracture characteristics of sandstone under different weathering grades. Brazilian tensile strength experiments were performed on Fresh and slightly weathered sandstone specimens using an automated compression measuring machine UTC-5431. Image-based fracture chara...

Discontinuities within the rock mass are present in a wide range of networks. Their characterization and analysis exist with considerable diversity. Prior research appraises the significance of mechanical discontinuities and their effect on geotechnical structures and deficient with integral discontinuities. The variability and uncertainty related...

Evaluation of fragmentation is an indispensable step in the optimisation of blasting. The various techniques for analysing blast fragmentation have their inherent issues causing various degrees of accuracy. Hence, each method is suitable for some specific purposes. This study evaluates and compares the particle size distribution of FYS granite aggr...

Indirect tensile testing is used in order to investigate the effect of particle morphology (shape and size) on the various weathering grade sandstone fracture characteristics. Several fracture characteristics are discussed in depth in this work including the fracture length (FL), fracture deviation area (FDA), fracture angle (FA), and fracture maxi...

The particles within the rock samples are present in extensive ranges of shapes and sizes, and their characterization and analysis exist with a considerable diversity. The prior research works have appraised the significance of the particle shape types and their effects on the geotechnical structures and deficiencies by evaluating the uncertainty-r...

Evaluation of blast efficiency in quarrying of aggregate stones is one of the most important decisions that should be made by quarry operators for productivity assessment. The regulatory authorities also evaluate blast efficiency for environmental safety compliance. In carrying out this task, there is usually a conflict of interests between the qua...

Wrong blasting can lead to various degrees of inefficiencies in the subsequent mining processes. It is therefore necessary to constantly evaluate blast results and optimise the process. Good blasting provides cheaper benefits when compared to crushing and grinding. Good blast may be expensive but its technical and economic benefits override such an...

The stability analysis of rock slopes has been a complex task for geotechnical engineers due to the complex nature of the rock mass in a tropical climate that often has discontinuities in several forms, consequent in several types of slope failures. In this study, a rock mass classification scheme was carried out in a tropical environment by using...

The effects on geotechnical properties of rock mass from the constituent particle morphology have been acknowledged since long. Particle morphology is among the most important parameters affecting the mechanical characteristics of rock, such as shear strength, cohesion, friction angle, porosity, groundwater seepage, and angle of repose. This review...

The results of blasting affect every other downstream operation in quarrying and mining process. Factors influencing blast results can be classified as either controllable or non-controllable. If desired fragmentation is to be obtained, the controllable factors (blast geometry and explosive properties) must be sufficiently designed to match the non...

Wrong blasting can lead to various degrees of inefficiencies in the subsequent mining processes. It is therefore necessary to constantly evaluate blast results and optimise the process. Good blasting provides cheaper benefits when compared to crushing and grinding. Good blast may be expensive but its technical and economic benefits override such an...

Blastability indicates strength characteristics of rocks and the ease with which the rocks can be broken. The drilling rate (drillability) of a rock mass is largely determined by mechanical and geological parameters. One of the cardinal objectives of drilling in mining is to drill the blast hole at the possible fastest penetration rate. The resista...

This paper analyses the stability of the design and construction of Kota Bunyih (KB) tailings dam of Rahman Hydraulic Tin Mine which is located at Kelian Intan, Pengkalan Hulu Perak. The stability assessment of KB tailings dam was conducted using 2D Limit Equilibrium Methods analysis software, Slide 6.0 from Rocscience Inc. using two different appr...

This study was carried out to examine the effect of blast design on fragment size of blasted muck pile. The study site is located at Simpang Pulai, Ipoh, Perak, Malaysia. The preliminary study involves of a total of four blasting sessions, structural mapping of blast area, measurement of peak particle velocity (PPV), fragmentation analysis of blast...

This paper analyses the sensitivity analysis of a natural-unreinforced slope in Kepong, Kuala Lumpur. In order to conduct a sensitivity analysis, several ranges of data, based on borehole information and figures and also typical range of earth materials geotechnical values are used to set the minimum and maximum value of parameters in Slide 6.0 sof...

This paper aims to study the effect of geological condition on fragmentation produced by blasting in a marble quarry in Simpang Pulai, Perak, Malaysia; as the condition of the in-situ rock mass is one of the major factors influencing fragmentation degree. Parameters taken into account are chosen from the Rock Mass Rating (RMR) system: discontinuity...

Modelling used to describe the size reduction processes have undergoes significant advances in recent year. Industry demands for more detailed information regarding breakage particle for comminution process. However, comminution process is governed by a large number of factors that influence the breakage of particle. These papers present how to eva...

The Pulai fluviatile gold placer deposit stretches along 17 km of the upper reaches of Sungai Galas, Gua Musang, Kelantan. Malaysia Mining Corporation (MMC) had proved-up sizeable reserves following drilling and bulk testing during 1979-1983. The valley alluvium ranges up to 1200 m wide and averages 6.2 m in thickness. The basal gold-bearing Kaksa...

In block caving, most existing knowledge of the mechanisms controlling gravity flow comes from idealized numerical and scaled physical modeling experiments on gravels and sands with narrow particle size and shape distributions. By contrast, actual block caves are known to have large discrete blocks, or interlocking groups of particles, which travel...

Percolation of fine particles occurs when mixtures of particles with different sizes are simultaneously exposed to shearing and/or volumetric deformations and gravitational forces. This results in the fine particles traveling through the bed of coarse particles. In Sub-level and Block Caves, percolation can impact on ore recovery, dilution and ulti...