mechanised decline development
M.M.S. (mechanised mucking system)
excavator controls & power pack
Bomar Projects
excavator in ‘park’ position under jumbo
(Pty) Ltd.
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mechanised decline development
MMS
Forward
 Decline development is presently labour intensive
 Speed of bringing shafts into operation is critical
 Steep declines
(15° or more) are slow & problematic
Bomar Projects
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mechanised decline development
MMS
Concept & design considerations
 Capable of operating in the range of 10 and 40°
 Have a relatively fast mode of exchanging hoppers/skips
 To improve safety
 The ability to move with the advancing face under it’s own
power
 Have the option of conveyor belt utilisation for declines to
15° degrees
Bomar Projects
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mechanised decline development
MMS
Description
A self propelled unit that comprises of the following main components:
 Hydraulically operated system, designed to move a platform and all the
components mounted thereon
 Built in facilities for rolling stock
 Conveyor, if applicable, for declines of 15° or less
 Hopper/skip exchange slave winch
 Hydraulic lateral jacks to anchor the platform
 Stop blocks for hoppers/skips
 Hydraulic excavator
 Blast protection chain screen
 Up ramp and rail track installation apparatus
 Hydraulic portal drill rig for mechanised drilling option or handheld
drill machine bay
 Safety features for excavator, hopper, drillrig movements
 Water tanks & positive displacement pumps to dispose of water
delivered by the face pump/s
Bomar Projects
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mechanised decline development
MMS
General Arrangement (with skips)
Bomar Projects
Rail
magazine
Skip in ‘park’ position
Portal
jumbo
Loader
Skip being
loaded
Hydraulic
slide floor
Blast
screen
For system with conveyor belt see video
available on request
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mechanised decline development
MMS
Specification
 Max component size: 9.1m x 0.5m x 1.45m
 Heaviest component: 5000kg
 Installed power: 102kW (for drillrig add 40kW to 110kW, for pumps add 22kW to
75kW)
 Hydraulics: 2 circuits/ 900 lt capacity. Pump pressure/flow compensated, piston
 Operating pressure: 150 - 210 bar
 Voltage: 525 - can be designed to suit
 Excavator traverse speed: 1m per second
 Speed of slide floor cylinders: 0.5m per minute
 Excavator slew: Max 5 rpm, 45° + 45°
 Effective mucking capacity per hour: (0.4m3 bucket - 20m3 or 32t); (0.5m3 bucket
- 25m3 or 40t); (0.6m3 bucket - 30m3 or 49t)
 Face shovel - bottom discharge
 Totally enclosed sliding floor of 3 main section. Width & length to suit specific
requirements. The width of the excavation will determine the set up of mucking
i.e. conveyor or hopper for inclination of 15° or less; hopper or skip for greater
inclinations. Hydraulic jacks incorporated in the main sections and are applied to
the sidewalls when expanding the slide floor to follow face advance
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mechanised decline development
MMS
Ancillary equipment
 A submersible face pump to supply the permanent
Tank/pump/s on the MMS via permanent floor pipes
 Slave winch to lower the empty skip to excavator
 Hydraulic lifting apparatus to shift skip from main line to wait
line
 Rail magazine situated at the rear of the sliding floor for easy
and rapid installation of permanent rails
 Slewing hydraulic crane at rear for material handling
 Bays provided for tools, hoses, drilling consumables and
spares.
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mechanised decline development
MMS
Safety
Excavator operator canopy
No lashing personnel required in front
Lock bell system for hopper/skip arrival/departure
Hopper/skip stop blocks, rails and switches
Excavator carriage - power off/out, brakes on
Advantages
Advance rates 100% faster in applications where the inclination is in excess of
15 degrees with capital and operating costs relatively lower than other
methods now in use
The ability of the MMS to allow for the
installation of rail tracks and/or
conveyor concurrently with the sinking
to meet the permanent equipping
requirements of the client
Bomar Projects
(Pty) Ltd
E.MAIL: info@bomar.co.za
TEL: +27 (11) 234 3349
FAX: +27 (11) 234 3365
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