SU1677309A1 - Method of combination mining of steep ore bodies - Google Patents

Description

to form a crack system 6 as a pad of broken ore. In the loosened soil, a flexible dividing overlap 5 is placed over the entire area of the underground section at the bottom of the open pit, one end of which is buried in the cutting slot 7, which by this time passed in the mountaineer of the second section remote from the open-pit mining. The length of the cutting gap 7 is equal to the thickness of the ore body 2. After installation of the flexible overlap 5, the overburden 4 during mining at section I is stored in an internal blade 8 formed on flexible overlap 5, and at the same time section II is prepared for mining. The ore massif of the section I, located under the flexible dividing overlap 5, is divided into two sub-floors 10 and 11.

Upper level 10 ore massif 9, section II. located under a flexible partitioning overlap 5, with any height they are beaten out ahead of the underlying sub-floor 11. For this, drilling workings 12 are held at the level of the sub-floor 11, then drill chambers 13 are formed, from where the set of fan holes is blown and blown up wells 14. Associated mining, when penetrating drilling workings 12 and drilling chambers 13, is delivered through stage 15 to rising 16, passed through the contact of ore body 2 and lateral rocks 17. From rising 16, ore is transported further along square 18, passed through horizon 19, give it to the surface of the trunk 20.

The ore 21 of the upper sub-floor 10 is repaired and is gradually mined.

In addition, with broken ore 22 of the underlying sub-floor 11.

The underlying subsurface 11, 5–7 m high, depending on the strength of the pillar, is beaten off by sectional fan-like boreholes. 23 drilled from the delivery workings 24, parallel to each other, passed on horizon 19.

When reaching the horizon 19 ahead of the excavation developed by the open works (section I), the broken ore 21 from the upper and lower sub-floors 10 and 11 is discharged in openings 24 to the bottom 25 of the space developed by open-pit mining.

In the last stage of mining the ore massif 9, with the retreating order from the cutting slit 7, the remaining pillar 26 of the ore massif 9 is sectioned off, section by section, starting from hanging side 27 to the lying side 17. Preliminary drilling chambers 28 are formed from where wells are drilled 29 and blow up alternately.

The underlying subsurface 11 is also beaten off by wells 30 drilled from the delivery workings without the creation of preliminary drilling chambers.

After complete cutting of the remaining pillar 26, a flexible dividing overlap 5 on the broken ore 31 is enlarged to cover the entire area of the developed space formed by joint mining.

Then, under the protection of the flexible dividing ceiling 5, the lower floor 32 is processed by the system of the floor forced collapse.

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Claims (1)

METHOD OF COMBINED DEVELOPMENT OF LARGE-FALLING ORE BODIES, including ore extraction by a first-stage open-pit mine to the design depth, joint ore mining below the design depth by open and underground mining at relevant sites in a single developed space ,. placement in the developed space of a flexible separating overlap, the formation of a cutting gap, ore blasting in the underground area in the missing order in the direction from