drift
Quick Summary
Drift mining is a method used to extract gold-bearing gravel deposits. Unlike hydraulic mining, it involves shafts and drifts to access the gravel. In the context of coal mining, a "drift" refers to a horizontal entry driven into a coal seam from its outcrop on the surface. This method is often the most cost-effective for accessing coal seams compared to slopes or shafts. Drifts can also be driven for exploration purposes to gain access to a deposit and establish drilling sites for a more comprehensive understanding of its size, shape, and mineral content.123
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miningHorizontal openings: driftsAll horizontal or subhorizontal development openings made in a mine have the generic name of drift. These are simply tunnels made in the rock, with a size and shape depending on their useāfor example, haulage, ventilation, or exploration. A drift running parallel to theā¦
Read MoreAll horizontal or subhorizontal development openings made in a mine have the generic name of drift. These are simply tunnels made in the rock, with a size and shape depending on their useāfor example, haulage, ventilation, or exploration. A drift running parallel to theā¦
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coal miningAccessā¦are three types of portal: drift, slope, and shaft. Where a coal seam outcrops to the surface, it is common to drive horizontal entries, called drifts, into the coal seam from the outcrop. Where the coal seam does not outcrop but is not far below the surface, it is accessedā¦
Read Moreā¦are three types of portal: drift, slope, and shaft. Where a coal seam outcrops to the surface, it is common to drive horizontal entries, called drifts, into the coal seam from the outcrop. Where the coal seam does not outcrop but is not far below the surface, it is accessedā¦
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tunnels and underground excavationsGeologic investigationā¦of small exploratory tunnels called drifts, which also provide for in-place field tests to investigate engineering properties of the rock mass and can often be located so their later enlargement affords access for construction.
Read Moreā¦of small exploratory tunnels called drifts, which also provide for in-place field tests to investigate engineering properties of the rock mass and can often be located so their later enlargement affords access for construction.
Read More- tunnels and underground excavationsRock chambers
ā¦using many borings plus exploratory drifts to locate rock defects, with a three-dimensional geologic model to aid in visualizing conditions. A chamber location is selected that offers the least risk of support problems. This objective was largely attained in the granite gneiss at Churchill Falls, where the location and chamberā¦
Read Moreā¦using many borings plus exploratory drifts to locate rock defects, with a three-dimensional geologic model to aid in visualizing conditions. A chamber location is selected that offers the least risk of support problems. This objective was largely attained in the granite gneiss at Churchill Falls, where the location and chamberā¦
Read More