We have worked on more than 1500 projects and with a significant number of different clients since our inception in 2003.
Our track record and superb industry relationships speak for themselves, as does our commitment to excellence and work set to the highest standards.
Bokai FS Project - Zimbabwe
Middindi was carried out the geotechnical aspects of the feasibility study for ERG Africa's Bokai project at Todal Mine in Zimbabwe. The study included the planning and oversight of the geotechnical drilling program, geotechnical logging and sampling, rock mass characterisation, and empirical and numerical modelling (UDEC). The key aspect of the study was to assess the extent of the frequently occurring shear zones near the orebody and how they impact the bord and pillar design. Design recommendations were made to delineate the project area into several ground control districts (GCDs) based on how the shears impact the stability and mineablity of the area, bord and pillar configurations for each GCD, regional pillar design, and ventilation shaft placement.
Magazynskraal Project - North-West, South Africa
Middindi has been involved in this project since 2006 when the initial BFS study was carried out, further work was conducted in 2013, 2019, and 2020. The numerous studies involved rock mass characterisation from a plethora of geotechnical boreholes, in-stope pillar design for conventional breast and up-dip mining configurations, support design, decline design, and boxcut design.
From 2022, Middindi oversaw the project start-up of the boxcut and decline for the East and Central boxcuts.
South Deep PFS - Gauteng, South Africa
A pre-feasibility study (PFS) was commissioned by Goldfields to evaluate the development of the mine south of the wrench fault (SOW). The mine has extensively operated north of the wrench fault (NOW) for over three decades. Middindi was tasked with outlining the rock engineering assessments of the adopted SOW mining and ground stabilisation strategy and additionally provided a validation of the layout using numerical simulations (RS3).
The geotechnical scope drafted by Goldfields required initially a review of the applicability of NOW design criteria to SOW. As the project progressed, Goldfields requested a variation to the scope to include a 3D numerical validation of the performance of the destress cut and LHSs. These two components of the scope provided an independent “sanity check” on the layout adopted for SOW.
Zimplats 3rd Party Review - Zimbabwe
Middindi was commissioned to independently conduct a rock engineering review of all operational boxcuts at its Ngezi operations in Zimbabwe. The 3rd party review was based on visual assessments of the boxcuts, and findings of the review technically vetted with as built (as opposed to design) numerical simulations of safety factors in dry and saturated states for each boxcut wall. The numerical simulations used the exact same numerical code adopted during the design phase so that direct comparisons could be drawn.
Hawiah Open Pit and Underground Geotechnical PFS - Saudi Arabia
The geotechnical components of the pre-feasibility study (PFS) for the Hawiah Volcanic Massive Sulphide (VMS) deposit in the Kingdom of Saudi Arabia were executed by Middindi under the auspices of SENET. The technical studies pertained to the underground sections, including the boxcut, portal pre-sink, decline, and mine design criteria, and open pit, including the overall slope configuration and waste rock dump design.
Other Middindi clients include (but are not limited to) the following: