Takht PDF Print E-mail

The Takht prospect located in Urumieh-Dokhtar arc in SE Iran. The Yugoslavs tested the Takht prospect with 6 short drill holes in two fences over a 300 x 200m area in the 1970’s.  The 2 best holes averaged 0.26 and 0.55% Cu.  The other 4 averaged between 0.03 and 0.15% Cu.  An unknown company has recently drilled about 9 diamond drill holes up to depths of 100m in a 200 x 100m area within the zone tested by the Yugoslavs.  Three of these holes were abandoned due to drilling difficulties and only part of the core from one hole has been assayed (DH 2 averaged about 0.6 – 0.7% Cu over the first 50m).  The Yugoslav holes were probably slightly peripheral to the good outcropping mineralisation and alteration – testing some shallow colluvial/alluvial covered areas - whereas the recent holes have been collared in the centre of the hydrothermal system.  There is not a strong alteration signature in the satellite images (MMI, 741, IAS).

A small (about 200 x 200m) feldspar/monzonite porphyry hosts, and has caused skarn type alteration and copper mineralisation within the volcano-sedimentary (tuffaceous sandstone, conglomerates, hornfelsed tuff?) country rocks.  This small stock has intruded on the margins of a larger granodiorite/granitic massif/batholithic body that is kaolinised on a regional scale (mapped as an altered intrusive).  Common alteration/mineralisation assemblages within the country rocks are: Kaolinite ± Sericite ± chlorite ± epidote ± carbonate ± tremolite ± magnetite ± pyrite ± chalcopyrite; and within porphyry: clay ± chlorite ± pyrite ± magnetite ± chalcopyrite ± malachite.  Weak-moderate quartz-sericite alteration was seen in outcrop and drill core and also locally K-silicate alteration exists at depth in drill core.  Quartz stockworking – some veinlets with pyrite ± chalcopyrite centrelines - of a good density cuts both porphyry and country rocks over an estimated area of 150 x 100m.  Quartz veinlets are greyish to blue-grey in colour and often sheeted.  A prominent hill (approx 100 x 100m) of massive quartz + magnetite is porphyry hosted and contains copper mineralisation averaging ~ 0.25% (Yugoslav hole T1).  Surficial copper mineralisation is manifested as malachite and the oxide profile is <30m from drill hole data, but may be partially oxidised to depths of <70m locally.  No chalcocite was noted (reported in traces by Yugoslavs and in greater quantities by Douzalkav).  Goethite is the dominant FeOx species at surface within the country rock skarns and porphyry.  The best copper mineralisation is associated with the quartz stockworking but good calc-silicate skarn type alteration and weak to no copper mineralisation continues beyond the area tested by drilling.  Visually, the better copper mineralised intervals appear to be within country rock rather than porphyry.

This style of hydrothermal system has not been seen in Kerman belt before by RTE.  This is primarily due to the country rock composition, which for the most part elsewhere has been andesitic.  The Takht - Chahar Gonbad area has potential to host this style of deposit which is still a valid target if of sufficient size and grade.

All results in ppm.

Hole/Depth Au Ag Cu Mo Pb Zn Mn As
DH1 / 63m 0.04 3.4 12913 10 8 202 1011 24
DH2 / 70m 0.03 2.1 8322 5 6 127 1083 63
DH4 / 92m -0.01 -0.5 2039 35 8 77 982 102
DH6 / 94m 0.03 1.1 4045 22 11 94 1815 295
DH5 / 58m 0.21 8 30112 6 6 221 2245 428

Takht is a porphyry copper mineralised hydrothermal system. Quartz-sericite and presumably K-silicate alteration are weakly present in the dril core.  On the basis of past/recent short drilling survey the following reserve calculated for the Takht porphyry copper prospect.
Oxide zone: 3 Mt @  0.6% Cu upto a depth of 30m. Oxide/transition locally extends upto a depth of 70 m.Sulphide zone: 10 Mt  @ 0.5% Cu upto a depth of 100m (the deepest drilled hole), mineralization is still open at depth and it is required to drill a couple deep holes to test the real potential of the deposit.There are no significant Au credits (locally <200ppb).
The Sirjan-Takht Copper Company has got the discovery certificate and mining licence for the Takht deposit and  is looking for foreign investor to develop a mine.