Date

2016-09-12

Author

Karpuz, Celal

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A hybrid underground mining method is selected for Karacat iron orebody located mid-south east of Turkey. For production levels at higher elevations above 1497, sublevel stoping with stope dimensions of 10 x 25 m is proposed. Below this level, production is planned to proceed with 5x5m cut & fill stopes. Production sequence is arranged for primary and secondary stopes in the sublevels of upper levels. Rock mass properties for the orebody and host rock units were characterized by geotechnical investigations. Results of laboratory experiments and classification work provided input data for numerical models. Considering technical and operational limitations and orebody geometry, various backfill scenarios were modelled. Alternative fill characteristics were investigated to sustain global stability. A relatively high quality fill with an unconfined compressive strength (UCS) of 1.5 MPa for primary stopes, and a lower quality backfill with a UCS of 0.75 MPa for secondary stopes were computed to be sufficient for the stability. For verification of the backfill quality, core samples collected from a field practice were tested in the laboratory. Results of uniaxial compression tests illustrated wide scatter. Observations pointed out that non-uniform particle size distribution with extremely large particles caused insufficient cementation in the backfill. An aggregate mixture with -30 mm particle size distribution and 6-8% cement ratio was recommended for the primary fill. To improve the performance of the filling in practice, waste rock to be used in filling practice was suggested to be processed by a crusher to assure the proper particle size distribution before mixing with cement.

URI

https://hdl.handle.net/11511/71639

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Unclassified, Article