Abstract: The impact of fatigue is seen not only in its effect on job performance of haul truck operators but also on the health of the operator and the productivity at the mine site. Its impact can even extend outside of the mine site to the health and well-being of the surrounding community (Fourie et al., 2010). In this paper, a case study of a small surface mining organization is presented. The goal is to highlight the fatigue risk management system implemented at the studied mine site. Mine safety personnel who were interviewed discuss the changes made to the infrastructure of the mine, to administrative areas such as the number of shifts and the use of vacation time, as well as the implementation of new technology into haulage vehicles. This paper reviews how these changes are supported in the research literature.

Abstract: A.B. Cecala, J.A. Organiscak, members SME, and J.D. Noll are mining engineer, mining engineer, research chemist, and J.P. Rider, member SME, is acting team leader at the National Institute for Occupational Safety and Health, Pittsburgh Research Laboratory, Pittsburgh, PA. Paper number TP-12-067. Original manuscript submitted November 2012. Revised manuscript accepted for publication August 2013. Discussion of this peer-reviewed and approved paper is invited and must be submitted to SME Publications by April 30, 2014. Abstract n Enclosed cabs have been used for many years to isolate workers on mobile equipment in the mining industry for health and safety reasons. These enclosed cabs create a microenvironment for workers where they can be either more protected or more vulnerable to contaminants. Over the past decade, the U.S. National Institute for Occupational Safety and Health (NIOSH) has performed substantial research efforts to improve the air quality inside enclosed cabs of underground and surface mobile mining equipment. In these efforts, NIOSH has partnered with mining companies, original equipment manufacturers (OEMs) and manufacturers of filtration and pressurization systems in a synergistic effort to reduce respirable dust and improve the air quality inside these enclosed cabs. Various field studies over this time have shown an array of results ranging from very minor to very significant reductions (protection factor: 3-89) in respirable dust levels inside these enclosed cabs. In addition to and concurrent with the field work, NIOSH also performed a comprehensive laboratory study to evaluate all the factors involved in cab filtration and pressurization systems and identified those factors that were most significant for an effective system. From this comprehensive research effort, the key components for an effective filtration and pressurization system have been identified in an effort to provide the best air quality to equipment operators inside of enclosed cabs of mobile mining equipment, thus minimizing respirable dust exposure.

Abstract: nSpontaneouscombustionisoneofthemostimportantsafetyissuesintheglobal� coalindustry�Itisconsideredtobeatriggerforexplosionsinundergroundmines,�especially� forgassymines�Thisthermaleventisnoteasilydetectableinthegobandsealedarea�Itis� alsoatoughjobtofindthemostlikelyhotpointaccurately�Admittedly,�determinationofthe� propensityforspontaneouscombustionbeforeminingactivityshouldbeanecessarystepin� thedesignofamineandventilationplan�However,�duetothecomplexityofthechemicaland� physicalpropertiesofcoal,�spontaneouscombustionhasnotbeenfullyunderstood�According� toaproximateanalysisofcoal,�itisbelievedthatsulfurandvolatilematterincoalarethe� mainintrinsicfactorsthatcausetheself-heatingofcoal�Theiroxidationatlowertemperatures� thanthatoffixedcarbontoinitiatecoal'sself-heatingshouldbequantified� Thisstudyaims� toimprovethepreviousmathematicalmodeldevelopedbytheauthorsforstudyingacoal's� propensityforspontaneouscombustion�Itenhancesthemodel'sabilitytoconsidertheeffects� ofsulfur,�volatilematterandmoisturecontentinthecoal�-�threeimportantfactorsaffecting� acoal'sself-heatingprocess�Basedonthelawofenergyconservation,�heatreleaserates� forpyriteoxidationandmoisturecondensationarebuiltintothemodel�Finally,�thesimulation� resultsintermsoftimeversustemperaturearecalibratedwithadiabatictestingdataextracted� fromtheliteratureforpyriteoxidationandmoisturecondensation,� respectively� Fromthe� modelingresults,�itisfoundthatthehigherthepyritecontentthecoalcontainsandthemore� moisturethatcondensesinanenvironmentwithhighrelativehumidityandinitialtemperature,� thehigherthepotentialforspontaneouscombustion

Abstract: The Office of Mine Safety and Health Research (OMSHR) investigated ways to increase mine airflow to underground metal/nonmetal (M/NM) mine working areas to improve miners' health and safety. One of those areas is controlled recirculation. Because the quantity of mine air often cannot be increased, reusing part of the ventilating air can be an effective alternative, if implemented properly, until the capacity of the present system is improved. The additional airflow can be used to provide effective dilution of contaminants and higher flow velocities in the underground mine environment. Most applications of controlled recirculation involve taking a portion of the return air and passing it back into the intake to increase the air volume delivered to the desired work areas. OMSHR investigated a Nevada gold mine where shaft rehabilitation was in progress and one of the two main fans was shut down to allow reduced air velocity for safe shaft work. Underground booster fan operating pressures were kept constant to maintain airflow to work areas, inducing controlled recirculation in one work zone. Investigation into system behavior and the effects of recirculation on the working area during times of reduced primary ventilation system airflow would provide additional information on implementation of controlled recirculation into the system and how these events affect M/NM ventilation systems. The National Institute for Occupational Safety and Health monitored the ventilation district when both main fans were operating and another scenario with one of the units turned off for maintenance. Airflow and contaminants were measured to determine the exposure effects of induced recirculation on miner health. Surveys showed that 19% controlled recirculation created no change in the overall district airflow distribution and a small reduction in district fresh air intake. Total dust levels increased only modestly and respirable dust levels were also low. Diesel particulate matter (DPM) levels showed a high increase in district intake mass flow, but minor increases in exposure levels related to the recirculation percentage. Utilization of DPM mass flow rates allows input into ventilation modeling programs to better understand and plan for ventilation changes and district recirculation effects on miners' health.

Abstract: The paper introduces the present situation and characteristics of vanadium resource in China,summarizing the current situation of mineral processing technology of pre-concentration for vanadium titano-magnetite,coal mine with vanadium resources,and graphite vanadium ore in domestic and overseas.Moreover,the paper discusses the prospect of beneficiation technology of vanadium resources.

Abstract: This paper introduces the key components,monitoring parameters and specific arrangement of on-line security monitoring system applied in tailings storage facility of Guandi Iron Mine,analyzes its monitoring results and demonstrates that on-line security monitoring system used in tailings storage facility of this iron mine is of high practicability and accuracy.AMS-V2.1,data processing software of GNSS,is the kernel software of on-line security monitoring system of tailings storage facility and has reached national advanced level.

Abstract: An effective technique to minimize miners' respirable dust and diesel exposure on mobile mining equipment is to place mine operators in enclosed cabs with designed filtration and pressurization systems. Many factors affect the performance of these enclosed cab systems, and one of the most significant factors is the effectiveness of the filtration system. High-efficiency particulate air (HEPA)-type filters are typically used because they are highly efficient at capturing all types and sizes of particles, including those in the submicron range such as diesel particulate matter (DPM). However, in laboratory tests, minimum efficiency reporting value (MERV) 16 filters have proven to be highly efficient for capturing DPM and respirable dust. Also, MERV 16 filters can be less restrictive to cab airflow and less expensive than HEPA filters. To verify their effectiveness in the field, MERV 16 filters were used in the enclosed cab filtration system on a face drill and roof bolting mining machine and tested at an underground limestone mine. Test results showed that DPM and respirable dust concentrations were reduced by more than 90% when the cabs were properly sealed. However, when the cab door was opened periodically throughout the shift, the reduction efficiency of the MERV 16 filters was reduced to 80% on average.