Description
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AMIS0298 Cu 15.65% Ag 346ppm Au 17.88g/t Chelopech Bulgaria
Origin of Material: The concentrate material for AMIS0298 was supplied by Namibia Custom Smelter (Dundee Precious Metals). The AMIS0298 concentrate is originally from Chelopech Mine located in central-western Bulgaria approximately 70 kilometres east of Sofia.
Mineral and Chemical Composition: Chelopech can be classified as a “gold-enargite high-sulphidation epithermal mineralizing system” similar to the deposits mined at Lepanto in the Philippines, El Indio in Chile, Freda River in Papua-New Guinea and Nansatsu in Japan. A cupriferous massive pyrite deposit is hosted in Upper Cretaceous andesitic to rhyodacitic pyroclastics and sub-volcanic intrusives. Massive pyrite predates the economic mineralization and is thought to be related to a phase of dacitic volcanism; whilst Cu, Cu-Au, Cu-Au-Pb-Zn and Pb-Zn mineralisation is later and related to a phase of injection of subvolcanic rhyodacites during the late Cretaceous. Mineralization shows a complex paragenesis with the main minerals comprising pyrite, quartz, chalcopyrite, tennantite and bornite whilst enargite, luzonite, tetrahedrite, gold, bournonite, chalcocite, sphalerite, galena, gypsum and barite are subordinate.
Recommended Concentrations and Limits
(at two Standard Deviations)
Certified Concentrations
Cu M/ICP 15.34 ± 0.98 %
Cu Titration 15.65 ± 0.39 %
Co Fus 604 ± 54 ppm
Co M/ICP 584 ± 69 ppm
Au Pb Collection 17.88 ± 1.04 g/t
Ag M/ICP 346 ± 39 ppm
As Fus 4.82 ± 0.55 %
As M/ICP 4.83 ± 0.32 %
Sb Fus 3724 ± 256 ppm
Zn Fus 1.12 ± 0.12 %
Zn M/ICP 1.09 ± 0.11 %
Specific Gravity 4.13 ± 0.18
Provisional Concentrations
Bi Fus 917 ± 122 ppm
Bi M/ICP 866 ± 176 ppm
Sb M/ICP 3571 ± 562 ppm
Sn M/ICP 788 ± 190 ppm
