Dewatering and Re open existing 10 degree decline shaft. Cast invert concrete, install new trackwork and services. Re-habilitate 150m of 4m wide x 2.5m high section (timber sets)
Rand Mines Properties Limited. Reference: B. Richards. Duration 4 months

1,350m of development. 800m long, 5m wide x 2.75m high decline shaft at 12 degrees; 4 stations; 400m of 2.5m wide x 2.5m high footwall drives and 150m raises. Casting of invert concrete and equipping with trackwork & services.
Gencor. Reference: H. Smith Chief of Operations. Duration 30 months.

Telex message – “Re: reference mario pietromartire limited to sink and equip an incline shaft of some 800 Metres. Mario pietromartire as m d of bomar proved not only efficient in completing the contract within time and price constraints but was very helpful in design of shaft and station layouts. I recommend him strongly for any such civil construction and he will have a permanent invitation to tender on any such work in my charge. Regards Hans Smith”

Development of 3,500m long 41LVL haulage, 4.95m wide x 4.5m high at 1:200 gradient.

East Rand Proprietary Mine. Reference: H.E. von Antwerpen – General Manager. Duration: 24 months

Telex message 28.11.84 I, herculas ernest fourie van antwerpen, employed as general manager of the blyvooruitzicht gold mining company limited, hereby certify that mr mario pietromartire from markon mining co. Is known to me personally and that he and the company he represented, markon tunnelling,executed a tunnelling contract to my entire satisfaction on another mine in the rand mineslimited group where I was then employed as assistant general manger and that I would have no hesitation in engaging his services in a similar contract should the need arise. From: h.E.F. Van atnwerpen, general manager blyvooruitzicht gold mining company limited.

Design and construction of 6No, 6m wide x 3.5m high x 3.5m long steel reinforced and grouted plugs
Sasol. Engineer: Keeve Steyn Inc. Reference: P. O’Dell – KSI. To seal against water ingress. The 2 sand, 1
cement grout mix was pumped from surface through a 1,200m long 25NB pipe collumn. Duration 6 months

Design and construction of 30No, 6m wide x 3.5m high x 0.6m thick steel reinforced and grouted plugs
Sasol. Engineer: Keeve Steyn Inc. Reference: P. O’Dell – KSI. To seal against water ingress. Duration 4 months

35m deep 13,900m3 crusher chamber, sink 1,043m long 15.28m2 shotcrete lined decline, 5m wide x 3.5m high at 15,5 degrees incl. concrete invert floor and access drifts to intersect decline.
Phalborwa Mining Company Ltd. Engineer: Fluor Reference: S.W. Robinson. JV with Clifford Harris (Pty) Ltd. High speed decline drill & blast using hybrid
rail bound / trackless mucking system (winch assisted LHD side tipping into railbound train span of ‘Grandori’ 20 tonne hoppers) hoisted to surface the ‘Grandori’ tippler arrgt. Duration 12 months (decline).

Erection of winder, headgear, sampling bins and sinking mainly through desert sand. equipping a 150m deep, 2.8m x 1.4m rectangular vertical shaft and developing a 1.8m x 2.8m high prospect drive.
De Beers / Falconbridge JV. Engineer: Anglo American. Reference: Dr. Loney – De Beers Prospecting. 50/50 JV with LTA Construction. Shaft excavation in compacted sand by hand using breakers & hand lashing with concurrent installation of steel sets & timber lagging support. Drive excavation using jackhammers and railbound cocopans. Duration 7 months.

140m deep, 4.8m diameter, concrete lined shaft
Sasol Operations. Engineer: Keeve Steyn Inc. Reference: J. Botha-Proj. Eng. 50/50 JV with LTA Construction. Temporary Works included the design and supply of headgear, kibble winder, bank steelwork & shaft stage for sliping. Raisebore 1.8m diameter pilot shaft, slipe and concurrent concrete lining. Mucking of the gravitated material at the shaft bottom done with an LHD. Duration 12 months.

127m deep, 6m diameter, concrete lined shaft
Sasol Operations. Engineer: Keeve Steyn Inc. Reference: J. Botha-Proj. Eng. 50/50 JV with LTA Construction. Re-using the winder and headgear from the previous project for the 4.5m diameter shaft; supply of new sliping stage and bank steelwork. Raisebore 1.8m diameter pilot shaft, slipe and concurrent concrete lining. Mucking of the gravitated material at the shaft bottom done with an LHD. Duration 7 months.

175m deep, 3.85m diameter Shaft
Sasol Operations. Engineer: Keeve Steyn Inc. 50/50 JV with LTA Construction. Provision of the winder, headgear etc., sliping stage and bank steelwork. Raiseboring 1.8m diameter pilot shaft, slipe & continuous slip-form concrete line shaft to 3.85m diameter from bottom up (first time used in a long shaft underground in SA). Mucking of the gravitated material at the shaft bottom done with an LHD. Duration 6 months.

175m deep, 3.85m diameter Shaft
Sasol Operations. Engineer: KSI. 50/50 JV with LTA Construction. Raisebore 1.8m diameter pilot shaft, slipe & continuous slip-form concrete line shaft to 3.85m diameter from bottom up. Mucking of the gravitated material at the shaft bottom done with an LHD. Very poor ground conditions caused fall of material from the sidewall approx 110m below surface. A custom designed fabricated steel pipe form and grouting from surface was used to consolidate this section. Duration 6 months.

165m deep, 9.6m diameter, concrete lined shaft.
Sasol Operations. Engineer: KSI. Sink shaft and concurrent concrete line to 9.5m diameter. Utilised hand held jackhammers for drilling and Eimco 630 loader to muck into kibbles. Duration 10 months

Sink 150m deep, 8m diameter vertical shaft, shotcrete line & decline rehabilitation
Gencor. Reference: I. McFarlane. Provision of Temporary Works winding gear and steelwork. Sink using hand held jackhammers and mucking done with Eimco 630 lashing into kibbles. Extensive emergency design and consolidation work carried out from surface for 7m wide x 4m high decline. Drilling and installation of cable anchors from surface and pumping of concrete to a custom designed shutter in the decline pre-fixed with reinforcing to support incompetent ground. Duration 14.5 months

340m long, 2.1m diameter reef raise
Client: R&D Anglo Platinum – BRPM mine. Primary purpose was to establish cutter costs. Temporary works included the construction of a structural steel assembly ramp and concrete works for initial gripping. The 2.1m, 340m long dia. raise was bored at between 14 and 17 degrees on the Merensky reef using a 1976 model Robbins Jarva MK6 gripper TBM (First time a TBM used for reef raising in SA). Best hour advance 1.33m. Best day advance 13.8m. Flammable gas detection contolled by on board sensor. Spot bolting, although planned for, was not necessary, Average penetration rate 0.47m per utilised hour. Resultant cutter life was better than expected. Duration 5 months. The TBM was designed for civil tunneling. For purposes of the trial it was considered a success and pointed to the great potential of the technology. Specific considerations to logistics, ventilation and removal of spoil etc. are being given for PGM mine environments in developing specific equipment.

80m deep, 5m diameter (4.32m lined diameter) vertical shaft and equipping with buntons & guides
Falconbridge Investments Zimbabwe. Engineer: Hatch. Reference: P. Taylor. Sink, concrete line & equip with buntons, guides, travelling way & service pipes. Drilling and cleaning by hand. A tower crane was used for hoisting rock and material. The shaft, sunk from surface, holed through into an existing sub-vertical shaft. The steelwork and guides were required to align with the existing installation with tight tolerances. Duration 6 months.

Line, equip 800m vertical shaft, # loading stn, spillage arrgt & h/gear mods
Kinross Holdings. Blanket Mine. Reference: C. Mangezi – Mine Manager. No.4 Shaft – Design, detail, supply, install & commission Temporary Works steelwork, stage, kibble winders and equipping stage, concrete line top 100m, strip existing buntons & guides, fabricate, supply and re-equip existing 800m rectangular 3 compartment shaft with buntons, guides, travelling way and services. Detail, fabricate, supply, Install shaft loading stn chutes, conveyor, crusher, shaft bins, loading chutes and shaft spillage arrgts. Modifications and additions to existing headgear. Duration 11 months

Support & Wetcrete Line existing 4.5m diameter x 450m long raisebored Vent
# between 17lvl – 24lvl
Harmony Gold Mining Company, Evander Mines, No 8#. Project Manager: P. O’Toole. Project Leader: K. Le Roux. Design, fabricate, supply and install temporary works UG headgear, shaft stage, stage winders, bank steelwork. Supply and install rock support and wetcrete lining equipment. Construct shaft collar and install man ride winder supplied by the mine. 2300No 20 dia. rockbolts. 5900m2 100mm thick 40mPA polyfibre reinforced wetcrete. Duration originally 10 months, extended for additional works ordered.

500m development & equipping – 12m² horizontal drives, raises, transformer & air cooling chambers.
Harmony Gold Mining Company, Evander Mines, No 8#. Project Leader: K. Le Roux.
Conventional tracked development. Hand held drilling. Railbound loader and rolling stock for mucking. Equip
with trackwork, ventilation and service pipes. Duration 8 months, extended for additional works ordered.

Repairs & maintenance – 900m vertical shaft, # loading stn, spillage arrgt & h/gear mods
Calidonia. Blanket Mine. Reference: C. Mangezi – Mine Manager. Repairs and maintenance of No.4 Shaft steelwork (buntons, guides and piping). Duration 4 months.

Equip 450m deep Shaft # buntons, piping & cables. Conveyance modifications. 4,500m, 17lvl & 18lvl equipping.
Harmony Gold Mining Company, Evander Mines, No 8#. Project Leader: K. Le Roux. 450m shaft buntons, air, chilled water piping, electric cables, modifications to stage, kibble & installation of penthouse. Equip 4,500m of horizontal drives with chilled water, condensor water, air piping & 2No pumps. Certificate of recognition-365 consecutive days without accident with loss of work. Duration 6 months, extended by an additional 6 months for extra works ordered.

Rehabilitate 66 degree deep ore-pass
Harmony Gold Mining Company, Evander Mines, No 8#. Project Leader: K. Le Roux. Ore pass rehabilitation. 13lvl to 14lvl main shaft ore pass (40m of ore pass required remedial work where the footwall was eroded to the extent it was nearly vertical with loose slabs on the sidewalls). Supply and establish concrete mixing equipment, and bring power, water and compressed air to the site area. Scope included bleeding, blasting of oversized rocks, installation of support where required, formwork and placing 645m³ 40mPA & 70mPA / 90mPA andesite lava concrete including pinning & reinforcement. Duration 4.5 months extended for additional works ordered.

Replace measuring flask in shaft
Harmony Gold Mining Company, Masimong No 5#. Reference: Shaft Engineer – M.J. Ndlovu. Dismantle & bring to surface old measuring flask, 2No. flask doors, cylinders. Over Easter weekend emergency project. Remove skip tipping path, conveyor drive / pulley, belt and RSJ beams between main winder compartments and the flask. Bring down and install new flask and reinstall conveyor, beams and tipping path. Duration 5 days.

800m long Decline, 5m wide 4.5m high at 8 degrees
Goldfields. Southdeep Mine. South Shaft. Reference: GF Shared Services. BPJV. 800m long, 5m wide, 4.5m high at 8 degrees trackless decline development including support. Duration 12 months.

1036m Development
Goldfields. Southdeep Mine. South Shaft. Reference: GF Shared Services. BPJV. 1,036m long, 6m wide x 5.5m high 83lvl development. Duration 16 months.

154m Development
Goldfields. Southdeep Mine. South Shaft. Reference: GF Shared Services. BPJV. 154m development. Duration 3 months.

69m deep, 3.2m diameter Vertical Shaft and 200m bulk sampling drive
Freeport McMoran, Tenke Fungurume Mine, Katanga, DRC. Reference: S. Lavoie – Manager Exploration. Reg. Bomar s.a.r.l. – Design, manufacture, install & commission temp. works kibble winder, stage winders, headgear, stage, kibbles, shutters, bank steelwork etc. & civils. Scope: 67m deep, 3.2m vertical shaft & 200m sampling drives at 60m lvl. Certificate of recognition-365 consecutive days without an accident with loss of work. Duration 11 months.

210m deep, 3.2m diameter Vertical Shaft and bulk sampling drives
MCOC, Tenke Fungurume Mine, Katanga, DRC. Reference: S. Lavoie –
Manager Exploration. Reg. Marcon s.a.s.u. – Design, manufacture, install & commission temporaryworks kibble winder, stage winders, emergency winder, headgear, stage, kibbles, shutters, bank steelwork etc. & civils. Scope: 210m deep, 3.2m concrete lined vertical shaft & sampling drives at 117m lvl (150m long) &
200m lvl (80m long). A concrete plug was constructed in the 117m lvl drive that reduced the unexpected 260m³ ground water inflows to 4m³.hr (fractured zone 50m into the drive required high volumes of cement grout & steel arch support. Exploratory core drilling carried out from the drive and dewatering facilities upgraded. Cover drilling & grouting (cement or chemical) and probe hole regime managed to keep inflows at 10lt.sec. 330 consecutive days without accident with loss of work.