Sinking machine for sinking shafts, in particular blind and freezing shafts
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Lining for the shaft of a mine
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Pit operation pressure medium pipe duct - has single bracket and duct at end of pipe comprising threaded sections
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Silver recovery from complex ores - by multistage flotation and cyanide leaching
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Sliding shaft support in unstable rock carrying water - has successive sections with intermediate bases and lubricant backfilling
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Method and device for introducing an extension into wells, in particular a watertight extension into wells to be sunk by water-bearing mountains
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Method and device for suspending and lowering a support unit with support rods and support ring for a concrete formwork in the course of lining manholes
