METHOD FOR SHOOTING OF ORE FROM MASSIF WITH FLAKY TEXTURE Russian patent published in 2010 - IPC F42D3/04 

FIELD: blasting.

SUBSTANCE: invention is related to mining industry, namely to methods for shooting of ore from massif with flaky texture. Method includes drilling of parallel rows of vertical wells at the angle χ to line of internal bench edge, charging of wells with charges of explosive substance (ES), assembly of internal well and surface blasting nets and row short-delay blasting of ES charges with production of flat blast compression wave in each row. Angle χ is identified from the following ratio: χ = (-1)ⁿπ/2 + θ + (-1)ⁿ⁺¹γ-arcsin(ctgα·tgψ), where π is angle equal to 180°; n is index of cutting direction, nl in case direction of cutting goes from left to right when looking at internal edge of bench and n=0 in case direction of cutting goes from right to left at the same view; θ is angle between line of ore layers spreading and line of internal edge of bench; γ is angle between line of wells rows and line of crossing of impact compression wave front plane with horizontal plane; α is angle of ore layers falling; ψ is angle between plane of impact compression wave front plane and vertical line. It is possible to accept the value of angle among two values of angle χ, which correspond to various directions of cutting, when it is most close to 90°.

EFFECT: invention makes it possible to improve efficiency of softening of intergrain ore joints and technical and economical characteristics of the following ore processing.

2 cl, 10 ex, 1 dwg