Zongshan Zou This email address is being protected from spambots. You need JavaScript enabled to view it.1, Jun Yang1

1State Key Laboratory of explosion Science and Technology, Beijing Institute of Technology, Beijing 100081, China;


 

Received: August 19, 2019
Accepted: March 28, 2020
Publication Date: September 1, 2020

Download Citation: ||https://doi.org//10.6180/jase.202009_23(3).0003  

ABSTRACT


A segregation blasting method was developed and implemented to improve the segregation of materials at the boundary of ore and waste, which can reduce ore loss and dilution in open pit mines. Through theoretical and simulation analyses, the design principle and blasting parameters for the segregation blasting were determined. The delay time of 100 ms was used to produce a separation zone at the boundary of ore and waste. The 3D laser scanning technology was used to evaluate the blasting performance. After optimization by experimental blasts, delay time of 17 ms, 64 ms and 100 ms was changed to 9 ms, 25 ms and 65 ms, respectively, and the loading efficiency increased 3.1% ~ 17.6%. Field studies indicated that the percentage decrease in ore loss was 2.63~5.3% and the decrease in dilution was about 2% by segregation blasting. Analyses and experiments indicated the segregation blasting method has the advantages of more proper fragmentation and muckpile shape, shorter loading time, less ore loss and dilution.

 


Keywords: Segregation blasting; Blast movement measurement; Muckpile; Position based dynamic; Ore loss and dilution


REFERENCES


  1. [1] Xingwana L (2016). Monitoring ore loss and dilution for mine-to-mill integration in deep gold mines: A survey-based investigation. Journal of the Southern African Institute of Mining and Metallurgy 116, 149-160. http://dx.doi.org/10.17159/2411-9717/2016/v116n2a6
  2. [2] Wang W., Huang S., Wu X. et al. (2011) Calculation and Management for Mining Loss and Dilution under 3D Visualization Technical Condition. Journal of Software Engineering and Applications 4, 329-334. doi:10.4236/jsea.2011.45037
  3. [3] Picorelli, R., Musunuri, A., et al. (2018) An engineering model to estimate blast movement and resulting ore loss and dilution. In Proceedings of the 12th International Symposium on Rock Fragmentation by Blasting, Luleå, Sweden, 11-13 June, 619-630.
  4. [4] Petropoulos, N., Wimmer, M., et al. (2018). Compaction of confining materials in pillar blast tests. Rock Mechanics and Rock Engineering 51 (6): 1907-1919. https://doi.org/10.1007/s00603-018-1447-8
  5. [5] Engmann E., Ako S., Bisiaux B. et al. (2013). Measurement and modelling of blast movement to reduce ore losses and dilution at Ahafo Gold Mine in Ghana. Ghana Mining Journal 14, 27-36.
  6. [6] Eshun, P.A.; Dzigbordi, K.A.(2016) Control of Ore Loss and Dilution at AngloGold Ashanti, Iduapriem Mine using Blast Movement Monitoring System. Ghana Mining Journal 16, 49-59. doi:10.4314/gm.v16i1.6
  7. [7] John, L., Batdelger, T.Q. (2016) Targeted buffer blasting to control movement along bedding plane shears. In Proceedings of the 16th Coal Operators’ Conference, Wollongong, Australia, 10-12 February, 500-508.
  8. [8] Little, T.N. (2015) Classification and development in grade control blasting for surface mines. In Proceedings of the 11th International Symposium on Rock Fragmentation by Blasting, Sydney, Australia, 24-26 August, 343-354.
  9. [9] Little, T. N., van Rooyen, F. (1988) . The current state of the art of grade control blasting in the Eastern Goldfields. In Proceedings Explosives in Mining Workshop, 87-96.
  10. [10] Everett, W., Eloranta, J. (2005) Digital Delay Blasting at United Taconite LLC; Publisher: Dallas, TX, USA.
  11. [11] Wagstaff, D.A., Scovira, D.S. (2004) Segregation blasting using electronic initiation at the Coeur Rochester Mine, Nevada. In Proceedings of the 30th Annual Conference on Explosives and Blasting Technique, New Orleans, LA, USA, 1-4 February.
  12. [12] Thornton, D.M. (2009) The application of electronic monitors to understand blast movement dynamics and improve blast designs. In Proceedings of the 9th International Symposium on Rock Fragmentation by Blasting, Granada, Spain, 13-17 August.
  13. [13] Choudhary, B.S. (2013) Firing patterns and its effect on muckpile shape parameters and fragmentation in quarry blasts. International Journal of Research in Engineering and Technology 2 (9), 32-45. doi: 10.15623/ijret.2013.0209005
  14. [14] Yang, H., Rai, P. (2011) Characterization of fragment size vis-à-vis delay timing in quarry blasts. Powder Technology 211, 120-126.doi:10.1016/j.powtec.2011.04.006
  15. [15] Tansey, D.O. (1980) A delay sequencing blasting system. In Proceedings of the 6th ISEE Conference on Explosives & Blasting Technique, Orlando, FL, USA, 28 June.
  16. [16] Adrian, R.J. (2005) Twenty years of particle image velocimetry. Experiments in Fluids 39, 159–169. doi: 10.1007/s00348-005-0991-7
  17. [17] Deul, C., Charrier, P. et al. (2016) Position-based rigid-body dynamics. Computer Animation and Virtual Worlds 27, 103-112. doi: 10.1002/cav.1614
  18. [18] Müller M., Heidelberger B. et al. (2007) Position based dynamics. Journal of Visual Communication and Image Representation 18(2), 109-118. doi:10.1016/j.jvcir.2007.01.005
  19. [19] Zhang S., Hurley J., et al. (1994) Blast rock movement and its impact on ore grade control at the Coeur Rochester Mine. Austin,Texas.,215-228. https://www.researchgate.net/publication/293622233
  20. [20] Rosa, D.L.; Thornton, D. (2011) In Blast movement modelling and measurement. 35Th Apcom Symposium, Wollongong, Nsw, 279-308.