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    Figure 2. Coal Creek bucket-line dredge is a popular visitor attraction. NPS Photo. In the far north, placer mining of permafrost and hard rock mining resulted in a scattering of abandoned mine features that have deteriorated in the harsh climate, leaving many naturally reclaimed.

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    Underground mining (hard rock) Underground hard rock mining refers to various underground mining techniques used to excavate hard minerals such as those containing metals like gold, copper, zinc, nickel and lead or gems such as diamonds.

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    Technical Report on Underground Hard-Rock Mining: Subsidence and Hydrologic Environmental Impacts By Steve Blodgett, M.S. and James R. Kuipers, P.E.

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    Mining is the extraction of valuable minerals or other geological materials from the earth, usually from an orebody, lode, vein, seam, reef or placer deposit.These deposits form a mineralized package that is of economic interest to the miner.

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    Tunnelling: Mechanics and hazards Jim St. Marie. Introduction. A tunnel is a long, narrow, essentially linear excavated underground opening, the length of which greatly exceeds its width or height.

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    Risk assessment is the process where you: Identify hazards and risk factors that have the potential to cause harm (hazard identification). Analyze and evaluate the risk associated with that hazard (risk analysis, and risk evaluation).

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    Traditionally, the task of cutting rock bolt and thread bar bolts has been a challenging exercise, with operational and safety concerns associated with grinding or oxycutting.

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    DEVELOPMENT OF NIOSH HARD-ROCK SAFETY TRAINING MATERIALS Elaine T. Cullen Spokane Research Laboratory, National Institute for Occupational Safety and Health,

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  • Specific and Non-Specific Hazards in Underground Mines

    Fire, flood, collapse, toxic atmospheric contaminant, and dust or gas explosion are the most critical hazards specifically linked to underground mining.