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Exploration in Dahanroud
Semi-detailed Geochemical Exploration Report on Dahanroud (1:20000)
 
  Page 1
 
   Executive: Mohammad Taqi Kore'i (2003)
   Dahanroud is at longitude 5932'31"- 5939'25"E and latitude 3155'00"- 3159'22"N. It is in northern Dahanroud topographic map 1:50000 and Chahar Farsakh geological map 1:100000 (Khorasan).
   Based on the results of geochemical studies, a zone at eastern Dahanroud was determined as an appropriate zone for semi-detailed geochemical exploration. First, 276 geochemical samples, 53 heavy mineral samples and 32 ore-bearing hand specimens were collected and analyzed. Next, sensor data were obtained and field, alteration and geological study results were integrated. Then, anomalous areas were identified and their data were published in 37 sheets.
   Rock units in the study area include ophiolites (cretaceous ultrabasic, peridotite, diorite and phyllite), altered and tectonized rocks, igeneous rocks (neogene andesite and altered andesite, altered granite), gneiss rock units and cretaceous layered and massive limestones.
   The dominant tectonic trend of Dahanroud is northwest southeast. Mineralization in the study area, following the trend of the main fault (northwest southeast), is associated with carbonate-siliceous rock units and found in the boundary between altered granites and peridotites.
   Based on the results of the analysis of alluvial deposits, maximum Au concentration was 2/9 mg/ton. Gold was not found in heavy mineral samples, except two samples with insignificant amount.
   Au content in ore-bearing hand specimens was 30-110 mg/ton and mainly associated with carbonate-siliceous rock unites (listvenites).
   In General, the anomaly is insignificant and working at 1:50000 is not recommended.
 
 
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