VNIPIpromtekhnologii, Moscow, Russia:

A. A. Silkin, Head of Science-Researching Laboratory of Mining Technical Modeling of Mining Processes, Candidate of Engineering Sciences, Silkin.A.A@vnipipt.ru
A. G. Urzhumov, Chief Specialist

Navoi Mining and Metallurgical Combinat, Navoi, Uzbekistan:
S. V. Rudnev, Chief Geologist
A. F. Ravshanov, Chief Engineer at the Central Mine Management

Muruntau open pit mine has been in operation since 1967 and is one of the largest open pit mines in the world. As per the project of mining phase V effective since 2020, it is among the world’s three largest open pit mines. The distribution of ore reserves per horizons is analyzed with regard to nature-and-process zones delineated in Muruntau–Myutenbai joint open pit mine. The project parameters of the pit and the scope of mining operations were determined from the geological and mathematical modeling including the detailed survey data and borehole assay results. The open pit mining scenarios within the project limits of mining phase V up to 2030 are considered. The open pit mining scheduling is performed with regard to operational specifics of the deposit, number of nature-and-process zones and duration of the scheduling period. It is concluded that maintenance of the required gold content of ore to be processed needs stimulation of the annual mining output up to 50–60 Mm3 in the easterly direction of the pit at the preserved production output in all nature-and-process zones. To this effect, it is required to formulate a sustainable action plan, with the assigned performance indicators, with regard to the Extra Activity Progr am to Improve Production of Precious Metals at Navoi Mining and Metallurgical Combinat over the period to 2026 and further on to 2040.
The authors appreciate participation of Head of a Department at VNIPIpromtekhnologii, Candidate of Engineering Sciences A. V. Seleznev in this study.

1. Sanakulov K. S. Navoi Mining and Metallurgy Combinat—the leader of the mining sector in Uzbekistan. Gornyi vestnik Uzbekistana. 2018. No. 4(75). pp. 8–13.
2. Sanakulov К., Tagaev I. Possibility to use bacteria for processing of mineralized mass of the Muruntau pit and the gold plant tailings. Tsvetnye Metally. 2020. No. 2. pp. 5–11. DOI: 10.17580/tsm.2020.02.01
3. Iuldoshev U. U. Expansion of deep open pit mine Muruntau in new limits of phase V. Gornyi vestnik Uzbekistana. 2016. No. 1(64). pp. 22–25.
4. Rudnev S. V., Ravshanov A. F., Silkin A. A., Seleznev A. V., Urzhumov A. G. Advanced scientific-and-engineering solutions and design choices in development of Zarafshan gold mining facilities. Gornyi Zhurnal. 2017. No. 1. Special issue. pp. 11–15.
5. Ravshanov A. F., Silkin A. A., Seleznev A. V. Evaluation of mining and transport equipment fleet for phase IV–V transition at Muruntau–Myutenbai open pit mine. Gornyi Zhurnal. 2018. No. 9. pp. 90–96. DOI: 10.17580/gzh.2018.09.15
6. Iuldoshev U. U. Opencast/underground access to deep levels at Muruntau open pit mine. Gornyi Zhurnal. 2018. No. 9. pp. 33–37. DOI: 10.17580/gzh.2018.09.02
7. Chekushina T. V., Vorobev K. A. Optimization of the contour of careers with the use of innovative technologies in the computer program "NPV Scheduler and Datamine-Studio 3". Vestnik evraziyskoy nauki. 2018. Vol. 10, No. 1.
8. Melik-Gaikazov I. V., Danilkin A. A. Basic aspects of deap open pit mine creation at the Kovdor Mining and Processing Plant. Gornoe delo. 2015. No. 1(3). pp. 15–22.
9. Jélvez E., Morales N., Nancel-Penard P., Peypouquet J., Reyes P. Aggregation heuristic for the openpit block scheduling problem. European Journal of Operational Research. 2016. Vol. 249, Iss. 3. pp. 1169–1177.
10. Cheban А. Yu., Sekisov G. V., Khrunina N. P., Shemyakin S. А. Upgrading continuous and cyclic excavation and transportation during open-pit mining. Eurasian Mining. 2014. No. 1. pp. 22–24.
11. Rybin V. V., Konstantinov K. N., Kalyuzhny A. S. Integrated approach to slope stability estimation in deep open pit mines. Eurasian Mining. 2019. No. 2. pp. 23–26. DOI: 10.17580/em.2019.02.05
12. Samavati M., Essam D., Nehring M., Sarker R. A local branching heuristic for the open pit mine production scheduling problem. European Journal of Operational Research. 2017. Vol. 257, Iss. 1. pp. 261–271.
13. Lamghari A., Dimitrakopoulos R. Network-flow based algorithms for scheduling production in multi-processor open-pit mines accounting for metal uncertainty. European Journal of Operational Research. 2016. Vol. 250, Iss. 1. pp. 273–290.14. Samavati M., Essam D., Nehring M., Sarker R. A new branching scheme for the open pit mine production scheduling problem. 45^th International Conference on Computers and Industrial Engineering. Metz, 2015. Vol. 1. pp. 504–511.