How To Use Chalcocite In A Sentence
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Some specimen labels state that this coating is chalcocite, but, to the best of my knowledge, the identity has not been established by analysis.
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At the Kingston mine, calcite occurred as thin massive veins cutting the lode and as modified rhombohedral crystals to 7 mm with inclusions of cuprite and chalcocite.
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Hole LAV-135A was drilled on Section 1200NE and intersected mainly alternating granodiorite and tonalite containing weak to moderate chalcocite in the uppermost 170 metres.
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The copper in these deposits occurs as primary chalcopyrite (CuFeS2) or the important secondary copper mineral chalcocite (Cu2S).
Rhenium
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Of particular note were intersections from the potentially leachable chalcocite-covellite dominant mineralization in hole ALD-136 of 0.568% Cu over 178 metres including 78 metres of 0.692% Cu and in hole ALD-138 of 0.791% Cu over 60 metres.
The Earth Times Online Newspaper
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chalcocite" of our present metallurgical science, which is a sulphide containing very nearly eighty per cent. of copper.
History of Phoenicia
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The deposit hosts a large zone of near-surface, higher-grade chalcocite-covellite copper mineralization that we believe will be amenable to SX/EW, heap leach copper production.
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The copper mineralization within the upper 300 metres of the deposit includes both supergene digenite-covellite and hypogene chalcocite-bornite replacing earlier chalcopyrite.
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The copper in these deposits occurs as primary chalcopyrite (CuFeS2) or the important secondary copper mineral chalcocite (Cu2S).
Rhenium
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Microcrystals of azurite and goethite and a small number of microcrystals of chalcocite were also recovered.
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It was formerly supposed that most of the chalcocite was of this origin; but as chalcocite is found in important amounts with enargite and chalcopyrite to great depths (now 3,500 feet), where the veins are still rich and strong, it begins to appear that much of the chalcocite is of primary origin.
The Economic Aspect of Geology
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Some of the chalcopyrite is rimmed by bornite and more rarely by covellite and/or chalcocite.
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No traces of other primary minerals are present and the chalcocite here is regarded as probably primary.
The Economic Aspect of Geology
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ALD-132 Mixed Cu mineralization 0.1 including Chalcocite-covellite zone 0.2
The Earth Times Online Newspaper
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In the easy recognition of the secondary copper sulphides, chalcocite, bornite, etc., the engineer finds a finger-post on the road to extension in depth; and the directions upon this post are not to be disregarded.
Principles of Mining Valuation, Organization and Administration
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While some chalcocite is clearly the result of secondary enrichment from above, other chalcocite seems to have been related closely to the primary deposition.
The Economic Aspect of Geology
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Spiroff reports cleavable masses of black calcite, with the color probably due to inclusions of chalcocite or tenorite.
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With the removal of some of the protecting zone of chalcocite the protore is again exposed to oxidation and a second cycle of enrichment begins.
The Economic Aspect of Geology
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In the United Verde Mine, oxidizing conditions at present prevail to the bottom of the chalcocite zone.
The Economic Aspect of Geology
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Two small dumps are exposed, affording an opportunity to collect some of the attractive microcrystals of rhodochrosite and crystals of apatite, gypsum, barite, goethite, marcasite, calcite, and chalcocite that are found there.
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ALD-103 Mixed Cu mineralization 0.1 including Chalcocite-covellite zone 0.2
The Earth Times Online Newspaper
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Cuprite occurred along with chalcocite as inclusions in small calcite crystals.
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We have seen sooty black material associated with native copper from the Eagle mine that is almost certainly chalcocite.
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Sulphur in blende, 375 in burnt ore, 377 in chalcocite, 376 in coal, 419 in copper, 207 in copper pyrites, 376 in mispickel, 376 in pyrites, 370, 376
A Text-book of Assaying: For the Use of Those Connected with Mines.
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Below this is a zone carrying copper in the form of chalcopyrite, enriched by chalcocite deposition from above, ranging in thickness up to 400 feet.
The Economic Aspect of Geology
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Near surface atacamite, chalcocite and malachite staining is evident in rock exposures.
Marketwire - Breaking News Releases
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It was formerly supposed that most of the chalcocite was of this origin; but as chalcocite is found in important amounts with enargite and chalcopyrite to great depths (now 3,500 feet), where the veins are still rich and strong, it begins to appear that much of the chalcocite is of primary origin.
The Economic Aspect of Geology
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Copper is known to be taken into solution as copper sulphate at the surface, and to be redeposited as chalcocite where these sulphate solutions come in contact with chalcopyrite or pyrite below.
The Economic Aspect of Geology
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The two major goals of the 2010 drilling programme at Altar are to further define the higher-grade, chalcocite-covellite zone which appears to be amendable to heap leaching, and to expand the global copper resource.
The Earth Times Online Newspaper
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The process of dump bioleaching of secondary copper sulfide as chalcocite and covelite includes two stages, in the first stage, the leaching speed is faster than that in the second stage.
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Copper is known to be taken into solution as copper sulphate at the surface, and to be redeposited as chalcocite where these sulphate solutions come in contact with chalcopyrite or pyrite below.
The Economic Aspect of Geology
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Numerous fissure veins and fracture planes were present that contained brittle arsenical copper and chalcocite.
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Acanthite was relatively abundant in what was known as the Mount Lyell Bonanza at the Mount Lyell mine, Tasmania, where it occurred with chalcocite, bornite, and tetrahedrite in ores that ran as high as 1,011 ounces of silver per ton.
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The natural inference was that as the veins were followed deeper the proportion of chalcocite would rapidly diminish, and that a leaner primary zone of chalcopyrite, enargite and other primary minerals would be met.
The Economic Aspect of Geology
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Mixed copper mineralization may contain both chalcocite-covellite and chalcopyrite-bornite mineralization.
The Earth Times Online Newspaper
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The primary copper mineral in the limestone is chalcocite, in exceptionally rich and solid masses, showing no evidence of having replaced earlier sulphides.
The Economic Aspect of Geology
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As a substantial, higher grade chalcocite-covellite zone near surface appears to be amenable to heap leaching, the 2010 drilling program will provide information to complete an independent, NI 43-101 compliant, Preliminary Economic Assessment ( "PEA") on a Solvent Extraction-Electrowinning ( "SX/EW") copper heap leaching operation within the next ten months, with a Preliminary Feasibility Study to follow, if warranted.
Marketwire - Breaking News Releases
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In this fifth and final set of results from 19 of 76 holes drilled this year, long intervals of copper mineralization were intersected in the chalcocite-covellite dominant zone
The Earth Times Online Newspaper
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Some of the chalcopyrite is rimmed by bornite and more rarely by covellite and/or chalcocite.
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The essential fact appears to be that as enrichment progresses and chalcocite increases the process of enrichment becomes slower in action, and erosion may, in some circumstances, overtake it.
The Economic Aspect of Geology
