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1.0 JOB PURPOSE
The Head of Mines is the most senior technical and operational leader responsible for all quarry and mining activities at the Dangote Cement Limited Tanzania Limestone Mines located at Mbuo Village, Mayanga Ward, Mtwara Rural District. The mine holds Special Mining Lease SML 495/2013 (11.27 Sq.Km, Active — 2 Blocks) and three additional Mining Leases (ML 00616, 00617, 00618/2017) covering a total mineral rights area of 37.96 Km² with estimated limestone resources of 666,955,677 MT — sufficient to sustain the 3.0 MTPA cement plant for 187 years. The role is accountable for the safe, efficient, and cost-effective extraction of mix grade limestone (bench 8–10M), high grade (HG) limestone (bench 2.5–3M), and top red soil/clay from the multi-layer open cast deposit, together with systematic overburden removal of top red soil (0–2.5M), shale inter-burden (3–5M), and marl/sandstone layers. The Head of Mines oversees in-house drilling and blasting operations using the Flexiroc D60 drill fleet (150mm, rotary percussive), the full Dangote-owned HEMM fleet of 16 equipment types, crusher feed quality and throughput control, compliance with all Tanzania mining and environmental regulations (TMAA, MEM, NEMC, Tanzania Explosives Act), and long-term mine planning to ensure uninterrupted raw material supply to the plant.
2.0 KEY DUTIES AND RESPONSIBILITIES
2.1 Mine Planning, Reserve Management & Licence Compliance Develop and implement short-term (Daily/monthly/quarterly), medium-term (annual), and long-term (life-of-mine) mining plans for all active and future mining lease areas across Block 1 and Block 2 of SML 495/2013 and MLs 00616, 00617, and 00618/2017. Manage the orderly and systematic mining sequence across active blocks, ensuring adequate limestone bench exposure, inter-burden clearing, and raw material stockpile maintenance at all times. Maintain and regularly update mine reserve estimates using survey data, blast reconciliations, and geological assessments — protecting the 187-year long-term resource base.
Coordinate with the Survey Engineer for regular bench profiling (particularly HG L.ST: 7M and feedable grade: 2M bench levels), topographic surveys, and volumetric production reconciliation. Ensure full statutory compliance and on-time reporting to TMAA and MM for SML 495/2013; actively support and monitor the process of formal licence issuance for ML 00616, 00617, and 00618/2017. Plan and initiate development of new mining blocks in advance to ensure seamless transition from SML 495/2013 to future Mining Lease blocks. 2.2 Limestone & Raw Material Extraction Plan and supervise daily extraction of mix grade limestone, high grade limestone, and feedable grade material from the multi-layer open cast deposit across active mining faces. Manage the excavation of top red soil and its segregation and stockpiling at the dedicated Red Soil Shed for use as a raw material in cement manufacturing. Optimise the blending of mix grade and high-grade limestone at the crusher feed point to deliver consistent raw material chemistry (CaO, SiO₂, Al₂O₃, Fe₂O₃) as specified by the Quality Control and Production teams. Manage the controlled separation and disposal of shale inter-burden and marl/sandstone inter-burden layers to prevent dilution of limestone quality at the crusher. Ensure limestone production targets are achieved monthly — supporting the plant target of over 3.4 million tonnes per annum. Maintain adequate limestone, red soil, and raw material stockpiles at the crusher and plant stock pile areas at all times to prevent unplanned plant stoppages. 2.3 Overburden & Mine Development Management Plan and execute systematic overburden removal — top red soil, shale inter-burden, and marl/sandstone layers — to maintain adequate exposure of mineable limestone benches well ahead of extraction. Develop a recovery programme to address the current overburden removal backlog (identified as a critical risk due to aging equipment prioritisation) and restore a minimum 12-month exposed reserve buffer. Manage overburden and reject material hauling to the designated Reject Site (approximately 2KM from active mining blocks), ensuring stable waste dump construction, compaction, and NEMC-compliant management. Monitor OB and development volumes monthly and report variances with corrective action plans.
Balance HEMM fleet allocation between overburden removal and limestone production to maintain both targets simultaneously without compromising either. Manage top soil stripping, preservation, and stockpiling separately from waste overburden in compliance with NEMC environmental permits and mine closure plan requirements. 2.4 Drilling & Blasting Operations Plan, supervise, and optimise all in-house drilling operations using the 2 × Flexiroc D60 drill rigs (150mm diameter, rotary percussive principle, average hole depth 6–10M depending on bench height) across limestone and overburden benches. Design blast patterns to achieve target powder factor: Burden (B) = 25–35 × drill hole diameter; Spacing (S) = 1.0–1.5 × burden; Explosive charging length = 2/3 hole length; Stemming = 1/3 hole length. Adjust drill patterns dynamically based on bench height, material hardness (limestone vs. shale vs. marl), and crusher performance feedback to minimise oversize boulders and Run-of-Mine (RoM) rejects. Control explosive consumption monthly to achieve budget targets without compromising fragmentation quality or crusher feed specification. Manage the on-site Explosive Magazine (located 2KM from active mining blocks) —
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