Investigations into the possibility of applying an underground bulk method for talc mining in the north part of the Rodoretto deposit, Italy

Franz Hatzl

Research output: ThesisDiploma Thesis


The aim of this thesis was to find an alternative mining method to the currently used underhand cut and fill method for the Rodoretto underground talc mine. Firstly, all available information concerning depth, thickness, dip, geometry, quality distribution and reserves of the north part of the talc deposit was put together. Based on available studies, all information in terms of rock and rock mass conditions of the talc, the hanging wall and the foot wall as well as data coming from inspections of cores and rock mass classifications were compiled. The Mathews method for determining the open stope stability showed that the competent hanging wall micaschist could stay open over spans of 30x30m or even larger, depending on the dip. Given the low strength of talc, any mining method using pillars was eliminated. Therefore, caving and sublevel stoping were investigated as the most promising methods. Due to the weak orebody rock, caving without restriction to above would result in large voids, thus leading to a situation difficult to control. This problem could be avoided by using down-dip, transverse sublevel stoping with a sublevel spacing of 10m and the stopes being backfilled from above with a strong, cement paste backfill. To restrict the caving upwards, a stable roof using cut and fill could be established above the first production level. Additionally, the use of pipe roofs to improve drifting and reinforce production drifts was worked out.
Translated title of the contributionUntersuchungen zur Möglichkeit der Einführung eines Abbauverfahrens für die untertägige massige Gewinnnung von Talk im nördlichen Teil der Lagerstätte Rodoretto, Italien
Original languageEnglish
  • Moser, Peter, Supervisor (internal)
Award date29 Jun 2007
Publication statusPublished - 2007

Bibliographical note

embargoed until null


  • Underground Mining
  • Talc
  • Mining Methods
  • Pipe Roof
  • Caving
  • Sublevel Stoping
  • Mathews method

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