The Experts below are selected from a list of 309 Experts worldwide ranked by ideXlab platform

Osanloo Morteza - One of the best experts on this subject based on the ideXlab platform.

  • determination and stability analysis of ultimate open pit slope under geomechanical uncertainty
    International journal of mining science and technology, 2014
    Co-Authors: Moradi Afrapoli Ali, Osanloo Morteza
    Abstract:

    Abstract In open-pit Mines, pit slope as one of the important parameters affects the mine economy and total minable reserve, and it is also affected by different uncertainties which arising from many sources. One of the most critical sources of uncertainty effects on the pit slope design is rock mass geomechanical properties. By comparing the probability of failure resulted from deterministic procedure and probabilistic one, this paper investigated the effects of aforesaid uncertainties on open-pit slope stability in metal Mines. In this way, to reduce the effect of variance, it implemented Latin Hypercube Sampling (LHS) technique. Furthermore, a hypothesis test was exerted to compare the effects on two cases in Middle East. Subsequently, the investigation approved high influence of geomechanical uncertainties on overall pit steepness and stability in both iron and Copper Mines, though on the first case the effects were just over.

  • Determination and stability analysis of ultimate open-pit slope under geomechanical uncertainty
    Elsevier, 2014
    Co-Authors: Moradi Afrapoli Ali, Osanloo Morteza
    Abstract:

    In open-pit Mines, pit slope as one of the important parameters affects the mine economy and total minable reserve, and it is also affected by different uncertainties which arising from many sources. One of the most critical sources of uncertainty effects on the pit slope design is rock mass geomechanical properties. By comparing the probability of failure resulted from deterministic procedure and probabilistic one, this paper investigated the effects of aforesaid uncertainties on open-pit slope stability in metal Mines. In this way, to reduce the effect of variance, it implemented Latin Hypercube Sampling (LHS) technique. Furthermore, a hypothesis test was exerted to compare the effects on two cases in Middle East. Subsequently, the investigation approved high influence of geomechanical uncertainties on overall pit steepness and stability in both iron and Copper Mines, though on the first case the effects were just over. Keywords: Safety factor, Probability of failure, Geomechanical property uncertainty, Overall pit slope, Stability analysi

Moradi Afrapoli Ali - One of the best experts on this subject based on the ideXlab platform.

  • determination and stability analysis of ultimate open pit slope under geomechanical uncertainty
    International journal of mining science and technology, 2014
    Co-Authors: Moradi Afrapoli Ali, Osanloo Morteza
    Abstract:

    Abstract In open-pit Mines, pit slope as one of the important parameters affects the mine economy and total minable reserve, and it is also affected by different uncertainties which arising from many sources. One of the most critical sources of uncertainty effects on the pit slope design is rock mass geomechanical properties. By comparing the probability of failure resulted from deterministic procedure and probabilistic one, this paper investigated the effects of aforesaid uncertainties on open-pit slope stability in metal Mines. In this way, to reduce the effect of variance, it implemented Latin Hypercube Sampling (LHS) technique. Furthermore, a hypothesis test was exerted to compare the effects on two cases in Middle East. Subsequently, the investigation approved high influence of geomechanical uncertainties on overall pit steepness and stability in both iron and Copper Mines, though on the first case the effects were just over.

  • Determination and stability analysis of ultimate open-pit slope under geomechanical uncertainty
    Elsevier, 2014
    Co-Authors: Moradi Afrapoli Ali, Osanloo Morteza
    Abstract:

    In open-pit Mines, pit slope as one of the important parameters affects the mine economy and total minable reserve, and it is also affected by different uncertainties which arising from many sources. One of the most critical sources of uncertainty effects on the pit slope design is rock mass geomechanical properties. By comparing the probability of failure resulted from deterministic procedure and probabilistic one, this paper investigated the effects of aforesaid uncertainties on open-pit slope stability in metal Mines. In this way, to reduce the effect of variance, it implemented Latin Hypercube Sampling (LHS) technique. Furthermore, a hypothesis test was exerted to compare the effects on two cases in Middle East. Subsequently, the investigation approved high influence of geomechanical uncertainties on overall pit steepness and stability in both iron and Copper Mines, though on the first case the effects were just over. Keywords: Safety factor, Probability of failure, Geomechanical property uncertainty, Overall pit slope, Stability analysi

Rosa Keyschwartz - One of the best experts on this subject based on the ideXlab platform.

  • cross sectional silica exposure measurements at two zambian Copper Mines of nkana and mufulira
    International Journal of Environmental Research and Public Health, 2008
    Co-Authors: Patrick Hayumbu, Thomas G Robins, Rosa Keyschwartz
    Abstract:

    We measured the quartz content of 20 bulk settled dust and 200 respirable dust samples in a cross-sectional dust exposure assessment that is part of an epidemiological study to ascertain the risk of nonmalignant respiratory diseases among Zambian Copper miners. Dust samples were collected from the Copper Mines of Mopani Copper Mine plc (Mufulira and Nkana Mines). Analytical measurements employed NIOSH Method 0600 for gravimetric analysis of respirable dust and NIOSH Method 7500 for quartz analysis in bulk and respirable dust samples. The measured quartz content of respirable dust showed that 59% and 26% of Mufulira and Nkana Mine samples, respectively, were above the calculated U.S. Occupational Safety and Health Administration permissible exposure limit. The mean intensities of respirable dust exposure at Mufulira and Nkana were 0.992 mg/m3 (range 0-7.674) and 0.868 mg/m3 (range 0-6.944), respectively while the mean intensities of respirable quartz at Mufulira and Nkana were 0.143 mg/m3 (range 0-1.302) and 0.060 mg/m3 (range 0-0.317), respectively. These results indicate weak dust monitoring at these Mines which may increase the risk of nonmalignant disease in many miners. Since Zambian mining regulations do not have crystalline silica exposure limits, these results accord with the recommendation that Zambian mining houses and the government establish crystalline silica analysis laboratory capacity and adopt dust mass concentration occupational exposure limits for more protective dust monitoring of workers.

Patrick Hayumbu - One of the best experts on this subject based on the ideXlab platform.

  • cross sectional silica exposure measurements at two zambian Copper Mines of nkana and mufulira
    International Journal of Environmental Research and Public Health, 2008
    Co-Authors: Patrick Hayumbu, Thomas G Robins, Rosa Keyschwartz
    Abstract:

    We measured the quartz content of 20 bulk settled dust and 200 respirable dust samples in a cross-sectional dust exposure assessment that is part of an epidemiological study to ascertain the risk of nonmalignant respiratory diseases among Zambian Copper miners. Dust samples were collected from the Copper Mines of Mopani Copper Mine plc (Mufulira and Nkana Mines). Analytical measurements employed NIOSH Method 0600 for gravimetric analysis of respirable dust and NIOSH Method 7500 for quartz analysis in bulk and respirable dust samples. The measured quartz content of respirable dust showed that 59% and 26% of Mufulira and Nkana Mine samples, respectively, were above the calculated U.S. Occupational Safety and Health Administration permissible exposure limit. The mean intensities of respirable dust exposure at Mufulira and Nkana were 0.992 mg/m3 (range 0-7.674) and 0.868 mg/m3 (range 0-6.944), respectively while the mean intensities of respirable quartz at Mufulira and Nkana were 0.143 mg/m3 (range 0-1.302) and 0.060 mg/m3 (range 0-0.317), respectively. These results indicate weak dust monitoring at these Mines which may increase the risk of nonmalignant disease in many miners. Since Zambian mining regulations do not have crystalline silica exposure limits, these results accord with the recommendation that Zambian mining houses and the government establish crystalline silica analysis laboratory capacity and adopt dust mass concentration occupational exposure limits for more protective dust monitoring of workers.

Sujatha Hariparsad - One of the best experts on this subject based on the ideXlab platform.

  • o05 6 pulmonary tuberculosis among underground miners exposed to silica dust in zambia s Copper Mines
    Occupational and Environmental Medicine, 2016
    Co-Authors: Rajen N Naidoo, Kingsley Ngosa, Sujatha Hariparsad
    Abstract:

    Aims To determine dust-related dose response risk for pulmonary tuberculosis (PTB) among underground miners exposed to silica dust in Zambia’s Copper Mines. Methods A cross sectional study of in-service miners (n = 360) was conducted at Occupational Health and Safety Institute (OHSI), Zambia. A systematic review of medical data over a 5-„year period from assessments conducted by doctors at OHSI and statutory silica exposure data (n = 16678) from the Mine Safety Department were analysed. Lifetime cumulative exposure metrics were calculated. Multivariate logistic regression analysis was used to determine the association between PTB and lifetime exposure to silica, while adjusting for various confounders. Results The median respirable silica dust level was 0.3mg/m3 (range 0.1–1.3). The overall prevalence of PTB was 9.7% (n = 35). In adjusted logistic regression models, high cumulative silica dust category showed a statistically significant association with PTB (OR = 6.7 (95% CI: 1.9–24.9)) and a significant trend of increasing disease prevalence with increasing cumulative silica dust categories was observed: (low CDE = 3 (2.5%); medium CDE = 11 (9.4%) and high CDE = 21 (17.1%)) (ptrend Conclusions Our results demonstrate the association of increased risk for PTB with cumulative dust in a dose related manner among this sample of Copper miners. There is need to intensify dust control measures and incorporate anti-smoking interventions into TB prevention and control programmes in the Mines.