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Losses and dilution of iron ore in mass-caving systems in Krivoi Rog mines

  • Underground Mining
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Soviet mining science Aims and scope

Conclusions

  1. 1)

    The enrichment of caved capping rock and the impoverishment of the ore during discharge constitute a single process.

  2. 2)

    The small specific proportion of the lump fractions and the thinly lamellar structure of the ore exclude marked effects of filtration and attrition on the quantitative aspect of ore impoverishment in Krivbass mines.

  3. 3)

    The difference in the grain-size compositions of the rock mixed with ore during impoverishment, and the diluting rocks, and in the iron contents of their fractions, is a basic cause of the more marked increase in dilution of one of the ore-body fractions during discharge.

  4. 4)

    The partial recovery of earlier lost ore, proceeding basically via one of the fractions of the diluting rock, must not be viewed as the increase in true recovery.

  5. 5)

    Increase in recovery of pure ore causes greater dilution of the remaining part of the reserves which are to be discharged.

  6. 6)

    The large size of self-caving capping rock in the majority of Krivbass mines helps to form enriched diluting rock with a higher proportion of fragments than in the caved ore, but with much less iron in this fraction than in the fines of the diluting rock. This predetermines the increase in fragment size as ore discharge progresses, and also the greater dilution of the fragmented (lump) commercial ores.

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Literature Cited

  1. G. M. Malakhov, Discharge of Ore from Caved Blocks [in Russian], Metallurgizdat (1962).

  2. I. K. Kunin, Discharge and Transport of Ore during Underground Mining [in Russian], Nedra, Moscow (1964).

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  3. N. G. Dubynin, Discharge of Ore during Underground Working [in Russian], Nedra, Moscow (1965).

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Authors
  1. V. K. Martynov
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  2. G. E. Simforov
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  3. L. G. Drochilov
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  4. A. A. Koval'skaya
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Additional information

Scientific Research Mining Institute, Dnepropetrovsk. Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Polyznykh Iskopaemykh, No. 2, pp. 72–79, March–April, 1969.

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Martynov, V.K., Simforov, G.E., Drochilov, L.G. et al. Losses and dilution of iron ore in mass-caving systems in Krivoi Rog mines. Soviet Mining Science 5, 166–171 (1969). https://doi.org/10.1007/BF02501895

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  • DOI: https://doi.org/10.1007/BF02501895

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