Justification of drill and blast pattern designs for ore treatment before in-situ leaching

The article discusses drill and blast pattern designs for ore treatment before in-situ leaching (ISL) in ore bodies of complex structure with a view to ensuring ecological safety, enhanced ISL efficiency, as well as balanced subsoil protection and management. This is achievable using cut-and-fill method with cemented backfill of different composition and strength, as well as with other geotechnical methods. It is shown that ISL of metals from solid ore requires high-quality preparation of large volume blocks, associated with blasting of tens of tones of explosives at a time. Rock fragmentation by blasting is improved through the higher powder factor to 2.9–3.3 kg/m3, as well as through accumulation of rocks with a degree of fragmentation not less than Kf = 1.2–1.3 in a limited space at the bottom of a stope. A case study of the concurrent application of a conventional mining technology and ISL technology in the Michurin deposit, on level 26–21 m, at the ISL block width of 20 m and shrinkage height of 35 to 50 m has proved the required stability of roof spans, without any falls of oversizes or off-standard sizes to ISL ore blocks. The recommendations for the design approaches to ISL are developed and tested in mined-out stopes in test block 5-86 and in pilot production blocks 5-84-86, 5-88-90 and 1-75-79.

Keywords: drill and blast pattern design justification design, ore treatment by drilling and blasting, in-situ metal leaching, solid ore.
For citation:

Lyashenko V. I., Khomenko O. E., Andreev B. N., Golik V. I. Justification of drill and blast pattern designs for ore treatment before in-situ leaching. MIAB. Mining Inf. Anal. Bull. 2021;(3):58-71. [In Russ]. DOI: 10.25018/0236-1493-2021-3-0-58-71.

Issue number: 3
Year: 2021
Page number: 58-71
ISBN: 0236-1493
UDK: 622.831:550.543
DOI: 10.25018/0236-1493-2021-3-0-58-71
Article receipt date: 06.05.2020
Date of review receipt: 25.06.2020
Date of the editorial board′s decision on the article′s publishing: 10.02.2021
About authors:

V.I. Lyashenko, Cand. Sci. (Eng.), Senior Researcher, Head of Research Department, SE «UkrNIPIIPromtehnologii», 52204, Zheltye Vody, Ukraine, e-mail: ipt@iptzw.dp.ua, vilyashenko2017@gmail.com,
O.E. Khomenko, Dr. Sci. (Eng.), Professor, National Technical University «Dnipro Polytechnic», 49005, Dnepr, Ukraine, e-mail: rudana.in.ua@gmail.com,
B.N. Andreev, Dr. Sci. (Eng.), Professor, Head of Chear, Krivoi Rog National University, Krivoi Rog, Ukraine, е-mail: andreyevbn@gmail.com,
V.I. Golik, Dr. Sci. (Eng.), Professor, Mining North-Caucasian State Technological University, 362021, Vladikavkaz, Russia, e-mail: v.i.golik@mail.ru.


For contacts:

V.I. Lyashenko, e-mail: vilyashenko2017@gmail.com.


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