| The beds at this level are distinctly pyritic and the basal Psiloceras-bearing limestone is underlain by a 20 m thick black shale. |
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| An additional sulphide-facies type was described as consisting of pyritic carbonaceous shale. |
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| Its down-dip sulfide ores were sideritic and pyritic, with golden barite forming one of the gangue minerals. |
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| Molds and pyritic casts are represented in some sandstone beds but are rare. |
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| The mill produced a lead concentrate, a zinc concentrate, and pyritic tailings. |
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| The member is commonly pyritic, and weathers to a distinctive white colour on inland exposures. |
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| The latter are intruded with three quartz porphritic intrusives locally hematized and pyritic. |
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| In the northern portion of the project, a sericitized and pyritic gold-enriched shear zone over 37 meters wide was discovered. |
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| They are commonly cross-cut by stockwork quartz veining and are usually pyritic. |
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| The upper portion of the sedimentary unit is brecciated and has pyritic chert and graphite horizons. |
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| The hole was stopped at 383.0 meters in a brecciated rhyolite locally pyritic. |
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| In the Eastmain Lowland sector, Barrick Gold Corporation has identified a gold-bearing pyritic horizon near Elmer Lake. |
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| A graphitic and pyritic argillite horizon was traversed between 73.6 and 78.1 meters. |
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| The high figure for North America is mainly due to pyritic sulphur in raw materials and also to low alkali cement production. |
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| Bio-sedimentological and geochemical study of the pyritic concretions in oil parent rocks. |
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| The flat-lying pyritic deposits are very low in gold content because the influence of Heaven, owing to the lack of fitness of the position, can exert itself but little. |
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| A more plausible theory is suggested by finely laminated pyritic shales, rich in organic carbon, that are commonly found at the Permian-Triassic transition in many areas. |
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| The top of the unit hosts a greater concentration of millimetre-thick graphitic beds combined with thin pyritic veinlets that could also generate a good conductor. |
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| It also suggests that placement of the most pyritic material at the bottom of the spoil heap would be desirable. |
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| Crushed pyritic black shale is used locally in the Eastern Townships for road metal, which yields dust, and through weathering, metals which are carried off the roads to waterways by acid rock drainage. |
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| Of the gold that is generated in other than pyritic veins some is found as native gold attached to the rock, some in yellow clay, some in a brown, fine alteration product, and some finally mixed and worked in with quartz. |
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| Oxidation of the finely ground pyritic minerals by means of upward currents of air, blown through a reaction vessel with sufficient force to cause the bed materials to fluidize. |
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| Several biological microorganisms are capable of removing pyritic sulphur from coal: other microbes are being evaluated to remove organic sulphur. |
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| The shales are often graphitic and occasionally slightly pyritic. |
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| Abundant pyritic slate, phyllite and schist were intersected with assays pending. |
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| Gold is associated with a north-northeast trending pyritic quartz felsite porphyry. |
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| Gold that is generated in a pyritic deposit is mixed with many and varied worthless impurities because pyrites is made from contaminated sulfur and an impure earthy matter. |
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| In the deepest sections where the palaeovalley is juxtaposed against basement, the sediments are mostly reduced, and locally carbonaceous, lignitic and pyritic. |
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| Pyritic nodules, up to 1 cm in diameter, with internal radial structure, are abundant in the claystones. |
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