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October 2015
MODERN MINING
33
TECHNOLOGY
blast design a step forward
Air Liquide - Improving gold recovery through local expertise Air Liquide Southern Africa Tel: +2711 389 7000, Kobus Durand (Metallurgy Manager) +2711 389 7377 Or contact us online at www.airliquide.co.za Air Liquide is a leading innovator in the application of gases to assist the metallurgy industry. The development of the system for leaching gold leads to improved efficiencies, reduction in costs and a boost in profits. facilitates, monitors and controls the oxygen in cyanidation tanks with an efficient injection system that delivers flow-rate, purity, pressure, uptime and Dissolved Oxygen. Air Liquide has been developing the right technology for the mining and metallurgy industry for years and is a world leader in industrial gases. AIR LIQUIDE’S summary of benefits • Reduced Process Cost • Quality • Service • Reduced Cyanide Consumptions • Improved Kinetics • Improved Recoveries There is an Air Liquide solution that is right for you. AL14590AL14590 Modern Mining E1 HP Feb 2015.indd 1
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block condition and volumes; blast-hole posi-
tions; and post-blast analysis of muckpile
shape, back damage and fragmentation.
The information is valuable not only for
reporting purposes but for assessing blast
performance by examining the distribution
of fragmentation and fly rock around a blast.
As these are orthophotos with geo-referenced
points, measurements can be made directly
off the images. The view from directly above a
blast is unique as it is possible to see and mea-
sure features that are not necessarily obvious
from any other angle.
Muckpile profiles can also be created, allow-
ing a geo-referenced, 3D digital surface to be
analysed easily for volumes and cross-sections.
Accurate vertical cross-sections are generated
quickly from cut-lines drawn on the surface in
the survey software.
For blast planning purposes, block-shape,
hole locations and areas of damage are vari-
ables that can be accessed from the data. The
position of holes can be detected from an ortho-
photo and saved as text-delimited files for use
in blast planning software.
Rock variation in a bench often has a sig-
nificant impact on blastability and explosives
performance, and it is sometimes necessary
to place waste or air decks in a hole travers-
ing a sequence of strata in specific locations
to concentrate or dilute the explosives energy.
To address these issues, the new drone-based
techniques also allow a closer inspection of
the blast area’s geology. A scaled image of a
face taken from a multi-copter provides a good
source of information on the positioning and
variation in width of strata in a single bench for
charge planning purposes.
BME’s experience from mining projects in
South Africa has shown the usefulness of using
drones to leverage existing photographic, soft-
ware and GPS technologies to improve blasts;
there is no doubt that this science has plenty of
potential yet to be uncovered.
Muckpile profiles
can also be
created, allowing
a geo-referenced,
3D digital surface
to be analysed
easily for volumes
and cross-
sections.