Overview
| Stage | Production |
| Mine Type | Open Pit |
| Commodities |
|
| Mining Method |
|
| Production Start | ...  |
| Mine Life | 2028 |
October 5, 2021 - Thor Explorations Ltd. is pleased to announce commercial production has been achieved at its wholly owned Segilola Gold Mine located in Osun State, Nigeria. The process plant is now consistently operating in-line with its design throughput capacity of 715,000 tonnes per annum. |
| Latest News | Thor Explorations Announces Segilola Exploration Update February 27, 2023 |
Source:
p. 26
Segilola Resources Operating Ltd. (SROL) is a company, domiciled in Nigeria, that operates the Segilola Gold Project, located in Osun State Nigeria. SROL is a wholly owned subsidiary of Thor Explorations Ltd.
Contractors
- Subscription is required.
Deposit Type
- Vein / narrow vein
- Orogenic
Summary:
Segilola is an orogenic-style lode gold deposit which occurs within a regional-scale shear zone.
Host rocks comprise an overturned sequence of high-grade amphibolite-facies metasediments intruded by a large, possibly differentiated, granodiorite sill-like body. The mineralisation is developed within a series of steeply dipping, tabular, very continuous, late stage quartz-pegmatite veins that do no exhibit any form of significant deformation such as folding or faulting. The geological and mineralogical characteristics of the mineralised veins are consistent throughout both the strike and down dip extents of the known resource.
Drilling results demonstrate that gold mineralization occurs in fractured pale to dark grey coloured smoky quartz veining, sheared pegmatite, and silica/chlorite/carbonate alteration. The mineralization is hosted in three steeply dipping vein sets or lodes; the Hanging Wall Lodes (Lodes 100 and 300, and minor lodes 400, 500 and 600) and the Footwall Lode (Lode 200). Together these form an elongate mineralized zone striking 010° and dipping 60° to 70° towards the west within a developed shear zone, primarily in biotite gneiss. The currently drilled mineralized zone is approximately 2,000 m in strike length, between 70 m and 200 m in depth, and between 2 m and 18 m in true thickness.
The mineralogy of the Segilola deposit is characterised by its general simplicity and consistency. The gold is entirely non-refractory and co ........
Summary:
The project is a conventional open cut operation utilising a fleet of drill and blast, load and haul equipment. SROL has engaged SINIC as the primary contractor to manage the mining contract which entails drill and blast, load and haul summarised accordingly:
• Owner; SROL.
• Principal Contractor; SINIC.
• Sub-Contractors; Sino-Hydro (Load and Haul) – Auxin (Drill and Blast).
Grade Control
Conventional open pit grade control practices will be used at Segilola Mine, incorporating RC drilling and sampling on a suitably designed drilling pattern and to cover three successive 6.0 m benches (6 x 3.0 m mining flitches).
Drilling and Blasting
Blasthole drilling will be conducted with track-mounted mobile drill rigs PowerROC D55 and the XuanHua 370 for the production and presplit drilling respectively. Current blast design is based on a 127 mm diameter hole. Blastholes are drilled for a 6 m bench height, with a 1 m sub-drill. Drilling for 6 m bench height is done with 115 mm diameter holes when required, with a 0.5 m sub-drill. However, it is possible to use a tighter space drill pattern using 89 mm diameter blast holes where the need for a high degree of selectivity is beneficial when attempting to minimize ore loss and dilution. There are several rock types and three weathering types in the pit that differ in the required powder factor to effectively break the rock so as to optimize blasting efficiency and fragmentation.
Source:
- subscription is required.
Flow Sheet:
Summary:
- subscription is required.
Reserves at January 4, 2021:
Open Pit Mineral Resources are reported at a cut-off grade of 0.30 g/t Au. A designed pit wireframe was used to constrain the resources.
Underground Mineral Resources are estimated at a cut-off grade of 2.5 g/t Au, beneath the open pit constraint and inside the high-grade wireframe lode models.
| Category | Tonnage | Commodity | Grade | Contained Metal |
|
Probable
|
4 Mt
|
Gold
|
4 g/t
|
517 koz
|
|
Proven & Probable
|
4 Mt
|
Gold
|
4 g/t
|
517 koz
|
|
Indicated
|
4,060 kt
|
Gold
|
4.66 g/t
|
608 koz
|
|
Measured & Indicated
|
4,060 kt
|
Gold
|
4.66 g/t
|
608 koz
|
|
Inferred
|
443 kt
|
Gold
|
4.78 g/t
|
68 koz
|
Financials:
| | Units | 2021 |
|
Revenue
|
M CAD
| ...... |
|
After-tax Income
|
M CAD
| ...... |
- Subscription is required
The total water consumption is estimated to be 3,251 m3/day, with fresh water consumption at 548 m3/day, and the recovered water consumption at 2,703 m3/day. Water in the raw water dam will be replenished by rainfall.
The total fresh water consumption of 548 m3/day includes water for processing at 406 m3/day, water for dust suppression and gland seal water at 40 m3/day, water for greening and spraying road at 12 m3/day, water for domestic use at 41 m3/day, and water for unforeseen purposes at 49 m3/day. The ratio of water reuse processing is 83%.
The fire water consumption for two-hour fire duration is 144 m3, and the make-up water will be used for this at a pumping rate of 30 m3/h.
Water supply standards are based on the following parameters:
• The water for processing is as per processing requirement.
• The domestic water is 285 L/person*day.
• The water for unforeseen uses is 10% of the fresh water.
The plant reclaim water will be pumped from the TMF. When required, raw water make up for the plant will be rain water stored in the plant feed water dam west of the processing plant. Process water will be stored in a dedicated 2.000 m³ reclaim water pond.
Potable water will be produced by treating raw water. Some raw water will be treated as non-potable water for daily use except drinking. The treatment process is physical filtration which includes sand filtration, carbon filtration, and ozone sterilization.
- Subscription is required.