Nakhlak Mine (Madan-e Nakhlak), Anarak District, Nain County (Nayin County), Esfahan Province (Isfahan Province; Aspadana Province), Iran
|Latitude & Longitude (WGS84):||33° 33' 47'' North , 53° 50' 42'' East|
|Latitude & Longitude (decimal):||33.56306,53.84500|
|Köppen climate type:||BWh : Hot deserts climate|
The Nakhlak mine, 55 kilometers northeast of Anarak is the largest and one of the most ancient lead ore deposits ever exploited in the Anarak region. Mining history, based on dated material from the mine adits and nearby historical ruins (e.g. the Qaleh-Bozorg fortress), was traced to the earliest stages of the Sassanid Empire (224-651 AD), and possibly even the latest stages of the Parthian Empire (247 BC-224 AD) (Hallier, 1972; Stöllner and Weisgerber, 2004). The Gombad and Shaft no. 1 of the Nakhlak mine are nearby undated historical digging sites (which may reach 80 m depth), where smelters and mining tools (e.g. picks, hammers, wooden shoes, lamps, etc) are still preserved (Pernicka et al. 2011). Old reports on Iranian lead ores, including Nakhlak, can be found in the articles of Vaughan (1896) and Stahl (1897). More modern mining started in the mid-1930s, in co-operation with German and Austrian engineers and geologists like E. Fischer, E. Bohne, G. Ladame and M. Mazcek.
The lead mineralization is situated mainly in the lower part of the Late Cretaceous carbonate rocks at Nakhlak, where sandstones and conglomerates are more common. Many characteristics of the ore deposit fit well with that of the typical Iranian MVT deposits (Rasa, 1987). The ore bodies occur within dolomites and dolomitized sandy limestones as steeply dipping quartz-calcite-barite veins or vein clusters of massive galena. Their thickness varies from 0.25 to 25 meters and extends up to 500 meters in length; it can be traced down along the dip to 400 meters deep (Romanko et al. 1984). Mining reserves have been estimated at ca. 7 million tons of lead (8.33%), zinc (0.38%) and a considerable amount of silver (72 g/t) (Cherepovsky, Chinakov and Kokorin, 1981). The lead greatly predominates over the zinc and silver contents, suggesting a basinal brine origin or fluid release model for the deposit (Rasa, 1987). The northern and southern flanks, as well as the deeper levels, offer potential supplementary mining possibilities, where even new ore bodies may be found.
The primary ore seems to be monomineralic, consisting solely of galena. Cerussite in various forms is common in the oxidized zone.
10 valid minerals.
This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.
Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org
0 - 2.588 Ma
|Quaternary sedimentary rocks|