Summary of Deposits
The deposit itself stretches over 32 km and contains 16 separate zones, up to 5 km in length, 380 m wide and extending 550 m down dip, seven of which have been studied in detail. The ore occurs in both primary and oxidized states. The primary ore accounts for 80% of the deposit and consists ofHistory
History reveals that Germans were the first to exploit this deposit systematically after planning a steel mill during or shortly after World War I. But the Great Game prevented this venture. Russians in the 1960s prepared a comprehensive report on the mineral resources of Afghanistan and tried to exploit them but they also failed. When the Kala Bagh steel mill was planned in the late 1960s in Pakistan, it was thought to use some percentage of Hajigak iron ore as the Pakistani mines were not of good quality but this scheme also failed.Geology of Hajigak
Afghanistan has a complex geology due to its position on the junction between the Indo-Pakistan and Asian crustal plates. It is composed of a series of terranes that broke away from the main Gondwana super-continent before becoming accreted onto the southern margin of the Eurasian plate. The accretionary events started in the Cretaceous, around 140 million years ago, and have continued until recent times. At some stage in the early Cretaceous there is evidence of a collision of one of these blocks, the Farad block, with the Eurasian plate, along the Herat fault zone. Shortly afterwards, the Helmand block collided with the Farad block. The rocks that host the Hajigak deposit are within the Herat fault zone, and it is likely they were originally part of the Farad and Helmand Blocks. The oldest part of the succession crops out north-west of the Hajigak deposits. It consists of grey silicified limestones and dolomites interbedded with dark grey crystalline schists and light coloured quartzites that display evidence of amphibolite grade metamorphism. The Hajigak iron deposit is hosted by the Upper Proterozoic Awband Formation that, together with the underlying Kab Formation, constitutes the Qala Series, a sequence of metavolcanic and metasedimentary rocks up to 4500m thick. The Kab Formation consists of dark grey sandy sericitic schists, interpreted as metamorphosed terrigenous rocks, acid volcanic rocks and minor beds of marble and phyllite. The Awband Formation is made up of schists (quartz-sericite, quartzchlorite-sericite, quartz-sericitechlorite and carbonaceoussericite) that are metamorphosed acid and basic tuffites and argillaceous rocks. Minor cherts and marbles also occur. The Green Schist Formation, a distinctive unit overlying the Awband Formation, consists dominantly of green chlorite schists, and quartz-sericitic schists locally intruded by granodiorites. Some reports consider it as a member of the Awband Formation. Upper Devonian rocks of the Hajigak Formation are faulted against the Green Schist Formation. Strata of Lower Cretaceous and younger age crop out in the south west of the area, unconformable on the older sequences. The predominant strike of the Proterozoic and Palaeozoic rocks is between north-east and north-north-east, with a regional dip of approximately 50° towards the south-southeast or south-east. One major steeply dipping fault juxtaposes the Upper Proterozoic rocks against the crystalline middle Proterozoic rocks. Another throws Upper Devonian rocks against the Upper Proterozoic Green Schist Formation. In addition a suite of north–south and north-west–south-east trending faults, some of them probably thrusts, affect the Upper Proterozoic succession, including the iron ore deposits. The Upper Proterozoic rocks of the Qala Series are interpreted as being deposited in a slowly subsiding marine basin. The initial basin fill was a variable sequence of sandstones and minor volcaniclastic sediments. Later there was an increase in volcanic activity and exhalative iron-rich fluids formed lenses on the sea floor. These sediments were subsequently altered by burial and low-grade (greenschist facies) metamorphism and became the basement of the Helmand Block. This block drifted away from Gondwana supercontinent in the Triassic. During the collision with Eurasia, in the early Cretaceous, faulting juxtaposed the Upper Proterozoic Qala series, the Middle Proterozoic rocks and the Upper Palaeozoic rocks. These fault-bounded blocks are a local characteristic of the Herat fault zone. As the collision progressed, the faulted blocks were folded into a northeast–south-west trending anticline the axis of which passes to the north of the area mapped. A series of thrusts developed as indicated by the increased thickness of the iron ore and its host rocks within the central zone at Hajigak. During the final phase of faulting the north–south and north-west–south-east faults that affect the ore deposits were developed. Later post-Cretaceous extension led to the further development of north-west–southeast faults and graben structures filled with young sediments. Subsequent erosion has exposed the core of the Hajigak anticline with the concordant ore bodies on the southeast limb.Mineralisation
The Hajigak deposit trends north-east–south-west for about 9 km and is made up of 16 separate ore bodies, each up to 3 km in length. The deposit can be divided up into three geographical parts, the western, central and eastern parts. In addition to the large ore bodies there is a substantial area of thin fragmental ore deposits in the form of four surficial deposits. The main hematitic ore is medium- to fine-grained and displays a variety of massive, banded and porous textures. It occurs in lenses and sheets, within the Awband Formation. The thickness of the lenses has been indicated by drilling to be up to 100m, while the depth of mineralisation is untested 180m below surface. There are two main ore groups: unoxidised primary ores and semi-oxidised ores. The primary ores occur below 100 m and consist of magnetite and pyrite, and up to 5% chalcopyrite and pyrrhotite. The oxidised ores, extending up to 130m below ground surface, consist mainly of magnetite, martite and hydrogoethite. Two other oxidised ore types, hydrogoethite/hematite/semi-martite and carbonate/semi-martite, occur sporadically in small amounts in the deposit. Alteration that may be related to the mineralising event has been observed within the host rocks, and includes sericitisation, silicification and carbonisation.Exploration
Iron occurrences were observed during initial geological mapping of the area in the mid thirties but the economical potential was not fully recognised until a joint Afghan-Soviet project, between 1963 and 1965, carried out an extensive study which mapped and described the deposit in some detail. The regional geology was mapped at 1:50 000 while the Hajigak deposit was mapped at 1:10 000. Focusing on the western area of the deposit, the study included detailed prospecting, trenching, ore sampling, four deep drillholes, a 200 m long horizontal adit and shafts into the fragmental ore. For two of the main ore bodies, I and II, horizontal plans and vertical crosssections were generated allowing the ore to be resource classified.Development
The remote and mountainous location of Hajigak makes it a challenging project for future development. However, the large tonnage and high iron content make it attractive to companies with the proven ability to plan and develop large world-class mines in demanding areas. The deposit remains untested below 180m and there is a potential for ore at greater depth. Additional prospects and mineral occurrences over a 60 km along strike, at Darrah-i-Nil, Khesh, Zerak, Kharkiza, SurkhiParsa, further increase the potential of the area. A feasibility study for the exploitation of the Hajigak deposit was undertaken in 1972 by a Franco-German group, Nenot-Pic. This proposed the construction of a blast furnace, based on the occurrence nearby of coking coal, providing an opportunity for the creation of an integrated iron and steel plant.Summary of Hajigak deposit
* A world-class iron ore deposit. * Estimated resource of two billion tonnes at approximately 62% Fe. * Sixteen ore bodies extending for up to 3 km and 100m thick. * Amenable to open pitting. * Coal resource nearby suitable for blast furnace/smelting.Award of concessions
In November 2011, the Afghan government has awarded four out of the five blocks at Hajigak to a consortium of seven Indian firms led by theIndian Government's Hajigak Mining Plan
In May 2016, India, Iran and Afghanistan signed an agreement to develop two berths atSee also
* Ashgabat agreement *References
{{Bamyan Province Bamyan Province Maidan Wardak Province Mining in Afghanistan Ore deposits