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Mining Science

Tytuł artykułu

Sequencing of ore columns for planning of large underground mines

Autorzy Glass, Hylke J.  Van Hout, Gert 
Treść / Zawartość
Warianty tytułu
Języki publikacji EN
EN Block caving is an underground mining technique which extracts ore from the base, rather than from the top, of typically massive deposits. Mining infrastructure is developed below the deposit before extraction commences. A network of tunnels provides access to a collection of drawpoints from which ore is mucked and hauled. With large deposits, not all drawpoints are developed simultaneously and the opening of drawpoints is sequenced to facilitate orderly extraction of ore columns above drawpoints. Sequencing fixes the initiation point for the entire block cave, or a part of it, as well as identifying the direction of cave advancement. The sequence of opening drawpoints influences the mine economics and is an integral aspect of planning a block cave mine. This paper discusses the optimisation of sequencing based on the net present value associated with extraction over the life-of-mine. It is shown that the maximum attainable net present value is obtained by a sequence in which ore columns are ranked in descending order of value. If significant variation of grade is present inside columns, an iterative procedure is given which corrects the sequence which yields the maximum net present value. The sequence with maximum net present value may not be practical or attractive from a caving perspective. Systematic design of sequences which permit orderly development of a block cave is discussed. To provide context, the net present value obtained from these feasible sequences is compared with the maximum attainable net present value. It is shown that the best feasible sequences in terms of net present value are preferentially initiated in zones with columns of high-grade ore.
Słowa kluczowe
EN block caving   sequencing   drawpoint   optimisation   net present value  
Wydawca Wydział Geoinżynierii, Górnictwa i Geologii, Instytut Górnictwa Politechniki Wrocławskiej
Czasopismo Mining Science
Rocznik 2019
Tom Vol. 26
Strony 157--171
Opis fizyczny Bibliogr. 7 poz., rys.
autor Glass, Hylke J.
autor Van Hout, Gert
  • Rio Tinto, 6 St James’s Square, London SW1Y 4AD, UK
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Kolekcja BazTech
Identyfikator YADDA bwmeta1.element.baztech-e80e41fe-4f52-4e76-80f6-969ad0dedf90
DOI 10.5277/msc192613