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Abstract
Results of theoretical researches and industrial experiments on technology of breaking of a massif with use of the artificial screens formed by lumbago of blasthole charges are resulted. In research the technology of breaking of ore by means of the vertical concentrated charges (VCC) on in advance formed screens is offered at underground mining. Possible ways of improvement of technology of working of deposits which will provide reduction of a production cost of ore are considered. The effective variant of a location of chisel developments, charges of the vertical concentrated charges (VCC) and artificial screens in the block is considered. It is analyzed the basic variants of formation of a shielding layer at breaking of ore by fans of deep boreholes and a location of boreholes in the coupled fan. The effective sequence of breaking of ore and necessary parameters of drilling-and-blasting is offered at underground mining. Comparison of results of measurements of granules of metric structure of the crushed mass on experimental sites of an ore mine is considered, analyzed and spent. The method of increase of efficiency of passage of the reflected and broken waves through the screen is offered at ore breaking. The considerable effect from explosion of charges in the presence of zones of unloading is resulted with is artificial they formed screens at massif destruction by the vertical concentrated charges.
Highlights
Raw-material base of ore mining branch of Ukraine are deposits of iron ores
On a mass particle of iron it on 4–6 % more low, and behind a mass particle of earth silicon on 11–13% above, than in commodity iron ore which gets on the world market from Brazil, Australia, Sweden and other countries
The Ukrainian iron ore raw material holds out a competition at the expense of its lower price
Summary
Raw-material base of ore mining branch of Ukraine are deposits of iron ores. The Ukrainian iron ore raw material holds out a competition at the expense of its lower price. The decrease of the cost price iron of ore raw materials is the pivotal problem at mining of deposits. As practice of mining of ore deposits most the item of expenditure in mining shows ore deposit iron there is an ore breaking [1, 2] It makes 25–30% from the general cost price on the block. Cost price decrease under article ore breaking can give considerable economic benefit. Explosive expenses should be connected with quantity of the bared surfaces in the block which is undermined. If the bared surface faces broken-down rocks in this case fading of amplitude of waves of stresses there will be something smaller, than in a case with the bared surface of considerable width [3,4,5,6]
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