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ABSTRACT
During the last few years, there has been a marked tendency in mining industry to adopt complex and sophisticated technology to make mining operations economically viable. The concepts of integrated operating systems are being gradually introduced with increasing pace of automation in mines. This paper discusses the concepts and various forms of system availabilities which can be used by mine engineers and managers for controlling the system performance. Examples are given to show the differences between these availabilities. The concept of availability target setting is also introduced in brief.