PRESENTATION S. CONVERSMIN S.A. Bucharest S.CONVERSMIN S.A. - - PowerPoint PPT Presentation

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PRESENTATION S. CONVERSMIN S.A. Bucharest S.CONVERSMIN S.A. - - PowerPoint PPT Presentation

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REPEDEA POIENILE MINE CLOSURE AND GREENING PRESENTATION S. CONVERSMIN S.A. Bucharest S.CONVERSMIN S.A. REPEDEA POIENILE MINE CLOSURE AND 1 GREENING REPEDEA POIENILE MINE CLOSURE AND GREENING Repedea Poienile de sub Munte

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REPEDEA POIENILE MINE CLOSURE AND GREENING 1

PRESENTATION

  • S. “CONVERSMIN” S.A. Bucharest

REPEDEA POIENILE MINE CLOSURE AND GREENING

S.CONVERSMIN S.A.

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REPEDEA POIENILE MINE CLOSURE AND GREENING

  • Repedea Poienile de sub Munte exploration sector

is located in the northern country, 23 km north towards the town of Vişeul de Sus, within the municipalities Repedea and Poienile de sub Munte.

  • S. CONVERSMIN S.A.

REPEDEA POIENILE MINE CLOSURE AND GREENING 2

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  • S. CONVERSMIN S.A.

REPEDEA POIENILE MINE CLOSURE AND GREENING 3

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REPEDEA POIENILE MINE CLOSURE AND GREENING

  • The mining sector is divided into two areas:
  • A. Repedea
  • B. Zănoaga – Poienile de sub Munte.
  • Mining works connected with the surface are 5

galleries that are executed as a result of geological research.

  • 3 galleries are located in the mining sector Repedea

and 2 in the mining sector Poienile de sub Munte.

  • Closing these coastal galleries was achieved through

embank and sealing with concrete walls.

S.C CONVERSMIN S.A.

REPEDEA POIENILE MINE CLOSURE AND GREENING

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REPEDEA POIENILE MINE CLOSURE AND GREENING

Also in Repedea-Poienile perimeters are 5 dumps, located at the mouth (entrance) of galleries. 3 dumps are located in the mining sector Repedea:

  • dump G1 Repedea
  • dump G2 Repedea
  • dump G3 Repedea

and 2 dumps in the mining sector Poienile de sub Munte:

  • dump G1 Zănoaga
  • dump G2 Zănoaga

S.C CONVERSMIN S.A.

REPEDEA POIENILE MINE CLOSURE AND GREENING

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REPEDEA POIENILE MINE CLOSURE AND GREENING

Greeneing dump Gallery G1 Repedea Before remediation work gamma dose rate was situeted between 0,30µSv/h and 9µSv/h on foreland and slope.

S.C CONVERSMIN S.A.

REPEDEA POIENILE MINE CLOSURE AND GREENING

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REPEDEA POIENILE MINE CLOSURE AND GREENING

  • S. CONVERSMIN S.A.

REPEDEA POIENILE MINE CLOSURE AND GREENING 7

Flow rate range dose before greening

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SLIDE 8

REPEDEA POIENILE MINE CLOSURE AND GREENING

According to technical project greening dump G1 works consisted in:

  • relocation of the radioactive material in the gallery;
  • geometrization of the dump slope;
  • channel for rainwater evacuation from the platform of

the gallery;

  • fitting the carpet of geocells on the dump slope and

filling with inert material from the dump; At the end of the works a measurements of gamma dose rate was made. The results obtained showed values less then 0,30 µSv/h.

  • S. CONVERSMIN S.A.

REPEDEA POIENILE MINE CLOSURE AND GREENING 8

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SLIDE 9

REPEDEA POIENILE MINE CLOSURE AND GREENING After greening a gamma dose rate distribution on the surface of the dump from G 1. Repedea

  • S. CONVERSMIN S.A.

REPEDEA POIENILE MINE CLOSURE AND GREENING 9

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SLIDE 10

REPEDEA POIENILE MINE CLOSURE AND GREENING Flow rate range dose before and after work remediation

  • S. CONVERSMIN S.A.

REPEDEA POIENILE MINE CLOSURE AND GREENING 10

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REPEDEA POIENILE MINE CLOSURE AND GREENING Greening Dump gallery G2, elevation + 903 m.

Determinations made in 2007 regarding the gamm's dump dose flow pinpoint on small areas (~ 20m2 ) values up to 0,36 µSv/h.

  • S. CONVERSMIN S.A.

REPEDEA POIENILE MINE CLOSURE AND GREENING 11

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REPEDEA POIENILE MINE CLOSURE AND GREENING

For stabilization, landscaping and greening of the dump gallery G2, the work focused on the following aspects:

  • geometrization of the dump slope;
  • reinforced rubble rock channel for the discharge of

stormwater from the platform of the gallery;

  • relocation of slightly contaminated material in the gallery;
  • alveoli fill of the geocellular carpet with inert material

from the dump;

  • the closure of the gallery with a concrete walls
  • S. CONVERSMIN S.A.

REPEDEA POIENILE MINE CLOSURE AND GREENING 12

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REPEDEA POIENILE MINE CLOSURE AND GREENING

Upon completion

  • f

the work

  • f

greening a investigation was carried on the characteristics of the radioactive dump. 1.Flow gamma dose performed with the grid system, highlighted values between 0,15-0,26µSv/h. 2.The concentration of Radon on the dump and on the mouth (entrance) of the Gallery is between 20-25 Bq/ m3.

  • S. CONVERSMIN S.A.

REPEDEA POIENILE MINE CLOSURE AND GREENING 13

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SLIDE 14

REPEDEA POIENILE MINE CLOSURE AND GREENING Gamma dose rate distribution on the surface of the dump from G.2. Repedea after greening

  • S. CONVERSMIN S.A.

REPEDEA POIENILE MINE CLOSURE AND GREENING 14

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SLIDE 15

REPEDEA POIENILE MINE CLOSURE AND GREENING Gamma dose rate before and after work remediation

  • S. CONVERSMIN S.A.

REPEDEA POIENILE MINE CLOSURE AND GREENING 15

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REPEDEA POIENILE MINE CLOSURE AND GREENING

Greening dump gallery G3, elevation + 795 m.

According to the closures technical project were carried

  • ut the following work to fix it:
  • relocation work of the dump material in order to

complete the volume of backfill in the existing gallery;

  • geometrization of the dump slope;
  • reinforced rubble rock channel for the discharge of

stormwater from the platform of the gallery;

  • channel with steps on the slope for mine water;
  • closing the mouth of the gallery.
  • S. CONVERSMIN S.A.

REPEDEA POIENILE MINE CLOSURE AND GREENING 16

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REPEDEA POIENILE MINE CLOSURE AND GREENING

Determinations made in 2007 have highlighted gamma dose rate values of up to 0,30 µSv/h. After the end of the reconstruction works, gamma dose measurements in flow rack 2x2 m showed a distribution

  • n the whole surface between 0,16-0,27µSv/h.

Radon concentrations were 18 Bq/ m3 on the dump and 25 Bq/ m3 at the entrance in Gallery.

  • S. CONVERSMIN S.A.

REPEDEA POIENILE MINE CLOSURE AND GREENING 17

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REPEDEA POIENILE MINE CLOSURE AND GREENING Gamma dose rate distribution on the surface of the heap from G.3. Repedea after greening

  • S. CONVERSMIN S.A.

REPEDEA POIENILE MINE CLOSURE AND GREENING 18

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REPEDEA POIENILE MINE CLOSURE AND GREENING

Gamma dose rate before and after

  • S. CONVERSMIN S.A.

REPEDEA POIENILE MINE CLOSURE AND GREENING 19

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REPEDEA POIENILE MINE CLOSURE AND GREENING Within the perimeter Poienile de sub Munte Greening dump gallery G1, elevation + 1093 m.

For stabilization, landscaping and greening of the dump gallery G1 were executed the following works:

  • relocation works of radioactive material into the existing

gallery;

  • geometrization of the dump;
  • installing geocelular carpet;
  • alveoli fill of the geocellular carpet;
  • planting seedlings over the dump platforms.
  • S. CONVERSMIN S.A.

REPEDEA POIENILE MINE CLOSURE AND GREENING 20

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REPEDEA POIENILE MINE CLOSURE AND GREENING

Dose rate gamma values resulting from the investigations carried out in 2007 were between 0,2-3,5 mSv/h, and surface flow intensity gamma dose greater than 0,30 mSv/h occupies an area of  190 m2 . On the surface of the dump after decommissioning works- greening, it was determined the distribution of dose rate with the rate values range between 0- 0,29µSv/h. Radon concentration is 21Bq/mc on the dump and 24 Bq/mc at the mouth of the gallery.

  • S. CONVERSMIN S.A.

REPEDEA POIENILE MINE CLOSURE AND GREENING 21

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REPEDEA POIENILE MINE CLOSURE AND GREENING Gamma dose rate distribution on the surface of the heap from G.1. Poienile after greening

  • S. CONVERSMIN S.A.

REPEDEA POIENILE MINE CLOSURE AND GREENING 22

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REPEDEA POIENILE MINE CLOSURE AND GREENING

Gamma dose rate before and after work remediation

  • S. CONVERSMIN S.A.

REPEDEA POIENILE MINE CLOSURE AND GREENING 23

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REPEDEA POIENILE MINE CLOSURE AND GREENING Greening dump gallery G2, elevation + 1027 m.

Gamma dose rate determinations made in the network of 2007, also highlighted values between 0,17-0,30 µSv/h. The work focussed on the following issues:

  • relocation works of the inert material for backfilling the existing

gallery;

  • geometrization of the dump slope;
  • reinforced rubble rock channel for the discharge of stormwater

from the platform of the gallery;

  • closing the mouth of the gallery.

Upon completion the work determination has been made to fiind out the dose gamma rate their for emphasising the values between 0,15- 0,29 µSv/h, and concentrations of radon is 23Bq/mc.

  • S. CONVERSMIN S.A.

REPEDEA POIENILE MINE CLOSURE AND GREENING 24

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REPEDEA POIENILE MINE CLOSURE AND GREENING Gamma dose rate distribution on the surface of the heap from G.2. Poienile after greening

  • S. CONVERSMIN S.A.

REPEDEA POIENILE MINE CLOSURE AND GREENING 25

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REPEDEA POIENILE MINE CLOSURE AND GREENING

Gamma dose rate before and after greening

  • S. CONVERSMIN S.A.

REPEDEA POIENILE MINE CLOSURE AND GREENING 26

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REPEDEA POIENILE MINE CLOSURE AND GREENING

CONCLUSIONS

Upon completion the remediation works at the former mining sector Repedea-Poienele de sub Munte there were no longer found radioactive materials and contaminated land.

  • S. CONVERSMIN S.A.

REPEDEA POIENILE MINE CLOSURE AND GREENING 27

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Specialized operator in ecological rehabilitation of mining affected sites and post closure monitoring

Thank you for support and good cooperation!

“CONVERSMIN” S.A. – Bucureşti

S.C CONVERSMIN S.A.

REPEDEA POIENILE MINE CLOSURE AND GREENING