SU1448037A1 - Method and apparatus for optical investigating of small-diameter blast holes - Google Patents

Abstract

. The invention relates to the mining industry. The goal is to reduce the dilution of ore during blasting. Light radiation of rocks intersected by the well is produced and together they measure the thickness of the quartz and shale sections of the well. The saturation with light and the absorption of light by the rocks surrounding the well are recorded. The results of all measurements determine the blast loop contour. A device for implementing the method comprises a housing with a sensor 8 placed therein with an illuminator 9. The recording unit 10 and the power supply unit 11 are connected in series with the sensor 8. In order to increase the reliability of measurements and simplify the design, the housing is made transparent. Photodiodes 12 are installed in it at a minimum distance from the illuminator 9. From the latter, photodiodes 12 are separated by an opaque screen 13. Using the method and device allows to correct blast contours. 2 sec. f-ly. 2 Il. about $ (L

Description

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The invention relates to the mining industry, in particular to the development of gangue deposits of complex morphological structure (nanometer, gold ore) with an ore-bearing ratio of less than 0.5.

The purpose of the invention is to reduce the dilution of ore during blasting, as well as to increase the reliability of measurements and simplify the design of the device for carrying out the proposed method.

FIG. 1 shows an example of the implementation of the proposed method, i.e. determination of the blasting contour by optical research of small diameter explosive wells (up to 60 mm); in fig. 2 is a schematic of an apparatus for carrying out the proposed method.

The method of optical investigation of explosive small-diameter wells includes light irradiation of rocks intersected by the well and jointly (cumulative) measurements of the power of the quartz and shale sections of the well, recording the light saturation and light absorption by the surrounding well and determining the blasting profile.

The method is carried out as follows.

According to the results of joint (cumulative) power measurements of quartz veins 1 and shale areas (interlayers) 2 in each well, 3 explosive fans build the actual configuration of the veins and determine the contour 4 of blasting. The bottom holes of wells 3 that go beyond the blasting circuit 4, as well as the b wells located behind the blasting loop 4, do not charge or explode, thereby reducing the dilution of the ore-bearing areas.

In other words, the blank Rock 6 between the design contour 7 and the contour 4 of blasting blasting, obtained from the results of optical investigations of production wells in accordance with the proposed method, is excluded (rejected) from the blasting volumes.

A device for carrying out the proposed method, i.e. for optical testing of small diameter bore holes, a housing (not shown) with a sensor 8 located therein with an illuminator 9 and registering unit 10 and the power supply unit AND connected in series with the sensor. The device is equipped with four photodiodes 12 and an opaque screen 13.

A sensor 8, consisting of an illuminator 9 and four photodiodes 12, is housed in a housing made transparent (for example, glass), and the photodiodes 12 are installed in the housing at a minimum distance from the illuminator.

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Titel 9 and separated from the latter by an opaque screen 13.

A device for demonstrating the proposed method, i.e. for optical is- / sledovann explosive wells of small diameter, works as follows.

When the sensor 8 moves along the well, the illuminator 9 through the transparent case irradiates the walls of the well, i.e. investigated rocks. The light incident on the rock is absorbed if the sensor 8 is in dark rocks (for example, in Slates). In this case, the photodiodes 12, separated from the light: l 9 with an opaque screen 13, do not perceive any radiation. If sensor 8 is in translucent rocks (for example, in gold-bearing quartz), then the rays of incident light penetrate into the rock and, reflected from the surfaces of the constituent crystal grains, are scattered in the rock, saturating it with light (quartz is luminous). In this case, the photodiodes 12 perceive the radiation, which is immediately detected by the portable recording unit 10, located by the operator and connected to the sensor by a serial five-core cable.

In contrast to the principle of measuring the intensity of reflected light used in the known method, the principle of recording the saturation and absorption of light by surrounding rocks used in the proposed method makes it possible to increase the reliability of the results of studies of monochrome (black and white) magmatic and metamorphic, especially translucent, and These include, for example, most of the gold bearing rocks. In addition, it allows to exclude light: filters and simplify the sensor, and the use of light from the entire visible spectrum allows to simplify the design of the recording device.

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Placing the illuminator 9 and the photodiodes 12 at a minimum distance from each other (in this case, for example, a distance flKH of 3-5 mm), with an opaque screen installed between them, eliminates the influence of the rays reflected by the wet walls of the well, on the results of the study.

The use of four photodiodes in combination with transparent (for example, glass)

The Q body of the sensor, instead of the two photo-resistances installed against the window, makes it possible to use a continuous (360 °) view of the borehole walls, instead of a periodic point study, in the research by the proposed method.

D in a known way. This increases the reliability of detecting undercuts of quartz veins by the walls of the well.

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Thus, the use of the proposed method provides high accuracy of measurements in the study of small-diameter wells, it is necessary to correct the contours of explosive blasting by eliminating rock plots and thereby reduce the dilution during blasting by 29-30%.

Claims (2)

Claim 1. A method of optical investigation of small diameter explosive wells, including light irradiation of rock intersected by a well and joint measurements of the thickness of quartz and shale sections of a well, characterized in that, in order to reduce ore dilution during blasting, saturation is recorded 0 light and the absorption of light by the rocks surrounding the well and the results of all measurements determine the blast contour. 2. Device for optical investigation of small diameter explosive wells, including a housing with an illuminator sensor and a registering unit and a power supply unit connected in series with the sensor, characterized in that, in order to increase measurement accuracy and simplify the design, it is equipped with photodiodes, an opaque screen However, the body is made transparent, and the photodiodes are installed in it at a minimum distance from the illuminator and separated from the latter by an opaque screen. Fue.i