TOP-DOWN CUT-AND-FILL MINING METHOD AT THE PERVOMAYSKIY DEPOSIT OF THE DONSKOY MINING AND BENEFICIATION PLANT
Ananin A.I. Tungushbayeva Z.K. Nurshaiykova G.T. Kalelova G.Zh.
2022National Academy of Sciences of the Republic of Kazakhstan
News of the National Academy of Sciences of the Republic of Kazakhstan, Series of Geology and Technical Sciences
2022#2022Issue 416 - 27 pp.
Based on the analysis of the world experience in the application of filling methods for ore extraction and laboratory studies, a technology has been developed for preparation of filling mixtures by a mill-mixing method with the possibility of operational transformation of the process flow diagram depending on the type of binding material (cement and cement-slag) and filling material (tailings, screenings, rock or sand). A backfill plant has been built, and pilot testing of the top-down cut-and-fill mining system of chrome ores has been started at the Pervomayskiy deposit under the protection of artificial ceiling, created in the upper layer of each sub-level. In the course of pilot tests, of the top-down cut-and-fill mining system with hardening mixtures and the complication of mining conditions showed the perspectivity of its use for excavation of reserves under artificial overburden as thick and medium thickness ore bodies of lower horizons. With a descending layered mining system, stopes and layered workings are filled with hardening mixtures with the formation of a bearing layer and a layer of reduced strength. The normative strength of an artificial mass in a layer of reduced strength (topping layer) is determined by the stability escarpments, and with their height up to 3.5 m, it must be at least 0.7 MPa. The normative strength of the backfill bearing layer according to the condition of stability of the horizontal outcrop (development of penetrations on the underlying layer) should be achieved at a 90-day hardening (4.0 MPa without reinforcement and 3.0÷3.5 MPa with reinforcement). The composition of the filling mixture must ensure the standard strength of the artificial mass within the specified hardening time and be transportable through pipes due to pressure drop.
Artificial ceiling , Backfill plant , Chromium ores , Cut-and-fill mining method , Dilution
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RSE ‘NE CPMRM RK’ ‘VNIItsvetmet’, Ust-Kamenogorsk, Kazakhstan
D. Serikbayev East Kazakhstan technical university, Ust-Kamenogorsk, Kazakhstan
S. Amanzholov East Kazakhstan University, Ust-Kamenogorsk, Kazakhstan
RSE ‘NE CPMRM RK’ ‘VNIItsvetmet’
D. Serikbayev East Kazakhstan technical university
S. Amanzholov East Kazakhstan University
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