Integral to the process is the scrubbing of gases liberated during roasting and, in particular, the development of an innovative and proprietary ore treatment process that produces an environmentally stable iron arsenate
mineral byproduct that meets international environmental standards.
The finding means that the company can now make more accurate geochemical models, observing how the iron arsenate
behaves over time.
Despite the enormous amounts of iron and arsenic in the Bou Azzer district, the iron arsenate parasymplesite is fairly rare compared to its cobalt equivalent, erythrite.
In the district, secondary iron arsenates generally form at the expense of lollingite, arsenopyrite, safflorite and skutterudite.
Whereas jarosite and iron arsenates
are more abundant in the central part of the lens, copper minerals, especially copper carbonates and conichalcite, occur predominantly in the peripheral zone.