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andesitic anhydrite annual output anticline associated average beds belt brimstone by-product carrying chalcopyrite chlorite company's copper concentrates country's Cretaceous crude crushing cupreous cupriferous pyrite currently dacite depth Devonian diabase dipping dolomite dome drilling east elemental sulphur Ermioni evaporite exploitation feedstock flotation pyrite fumaroles galena GEOLOGY grade gypsum Huelva important iron sulphide known Kuroko Lake limestone located magnetite miles mill million t.p.a. million tonnes mining operations Miocene native sulphur Occurrences and Deposits occurs on-stream orebody phyllites principal processing production pyrite concentrates pyrite produced pyrrhotite recovered sulphur refinery region reported represented reserves rocks schists sediments shaft smelter smelting source of pyrite source of sulphur sphalerite stopes Sulitjelma sulphide minerals sulphur content sulphur recovery sulphur-bearing sulphuric acid capacity sulphuric acid plant t.p.a. sulphuric thick tonnages tonnes of pyrite tonnes of sulphur tons Tortonian tuffs underground volcanic Yanahara zinc concentrates zone