Description
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AMIS0421 Cu 15.88% Ag 67.1g/t Au 26.31g/t Chelopech Bulgaria
Origin of Material: The concentrate material for AMIS0421 was supplied by Namibia Custom Smelter (Dundee Precious Metals). The AMIS0421 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 15.88 ± 0.59 %
Cu Titration 15.82 ± 0.30 %
Au Pb Collection 26.31 ± 1.86 g/t
Ag M/ICP 67.1 ± 2.9 g/t
As M/ICP 5.13 ± 0.59 %
Bi M/ICP 588 ± 60 ppm
Zn M/ICP 9323 ± 820 ppm
Specific Gravity 4.43 ± 0.10
Provisional Concentration
Co M/ICP 148 ± 19 ppm
