The following information is an extract from The Achmmach Tin Project Small Start Option Definitive Feasibility Study Report completed in 2016.
The Project infrastructure requirements embrace the off-site access road, HT power transmission line and communications system, together with the on-site components of water supply, roads, power supply and distribution, offices, workshops and laboratory, IT networking and personnel accommodation.
The following sub-sections describe the components of Project infrastructure.
The SSO_PFS called for the provision of a 22 kV, 8 MVA power transmission line on the assumptions relating to mine power draw and the exclusive use of low power EDS mills in the ore process plant. However, refinement of mine ventilation estimations and ore milling requirements increased Project power draw to 6.7 MVA in Stage 1, rising to 9.6 MVA in Stage 2. The latter draw exceeds the capacity of the proposed 22 kV line, consequently leading to the requirement for a 60 kV 10 MVA line.
The method of provision of this line has not changed. It will be designed by the Office National d’Energie et Eau Potable (ONEE) (Part 1) and constructed by an HT contractor approved by ONEE (Part 2). ONEE estimates the construction period for the 44 km transmission line to be 12 months.
The 20 km of unsealed road that links the site to the sealed road network will be substantially upgraded to safely accommodate the traffic required to service the Project. These works will include repairs to erosion damage, drainage and widening in some bends. Sections of the road will be sealed where it passes through the hamlets of Amoun al Charif and Koudit.
Given the site access road is a public thoroughfare, ATS recognises there will be a regular flow of farm and forestry traffic on the road. This typically comprises farm utility vehicles, forestry trucks of about 10t capacity, minibuses and motorcycles. Farm utility traffic is typically heavier on local market days including Mondays (Ras Ijerri), Thursdays (Agourai) and Saturdays (Sebt Jajouh).
ATS will be responsible for providing a 60 kV/22 kV transformer station at the terminus of the ONEE transmission line. A suitable HT contractor will be engaged to provide this facility, and then to construct the site 22 kV distribution network.
ATS proposes to make use of existing roads in the Project site, as illustrated in the site plan. These roads will provide service access and ore haulage, and thus ATS will engage a suitable contractor to make them safe. This will involve widening, sheeting and compacting, and the construction of appropriate berms on downhill margins.
The existing site camp is in good condition and will accommodate expatriate construction and then operations personnel, including contract mining personnel. Allowances for the installation of additional beds and upgrading of the sewerage system have been made.
Office accommodation will be met by the use of existing buildings together with the local purchase of two-storey demountable units. Most of the office accommodation will be erected on cleared ground to the west of the existing camp.
Workshops for the mining operation will be installed in the same location. Provision for sheltered sea container construction has been made.
The existing core preparation facility will be upgraded to accommodate site laboratory services.
Miners’ ablution facilities and industrial laundry facilities will be installed in the vicinity of the Central Portal.
ATS has made provision for the supply of fire extinguishers and office fit-out throughout the site.
A contract communications provider will install a point to point communications service between Achmmach and the Kasbah corporate office in Perth. A local contractor will establish on-site internet-based services. Partitioning of this service will provide exclusive commercial support and a “domestic” service for camp residents.
Potable Water and Sewage Treatment
Existing water bores will provide water to the operation. Potable water will be produced at the existing facility adjacent the camp from where it will supply offices and also at the process plant. Treated water will be delivered to the mine
ATS has made provision for the supply and installation of vendor water treatment and sewage process plants at the project. Individual sewerage systems will service the camp, offices and workshops, mine ablutions and ore treatment facilities. The mine will also be equipped with underground facilities.
The site will operate on diesel fuel and LPG for the camp kitchen. ATS does not intend to utilise petrol. LPG will be purchased in 50 kg cylinders from local distributors.
Fuel supply company Afriquia will deliver bulk diesel to a storage a dispensing system that it will provide free of charge to ATS. ATS has made provision to prepare a site for the Afriquia installation, although details have not been finalised.
Kasbah and ATS drew on their local experience and obtained vendor quotations current as at H1 2016 to arrive at the infrastructure capital breakdown as per the below: