"chalcocite" of our present metallurgical science, which is a sulphide containing very nearly eighty per cent. of copper.    From Wordnik.com.  [History of Phoenicia] Reference

The copper in these deposits occurs as primary chalcopyrite (CuFeS2) or the important secondary copper mineral chalcocite (Cu2S).    From Wordnik.com.  [Rhenium] Reference

At Butte for instance, secondary chalcocite is clearly to be recognized.    From Wordnik.com.  [The Economic Aspect of Geology] Reference

Near surface copper values are associated with the presence of chalcocite.    From Wordnik.com.  [Marketwire - Breaking News Releases] Reference

The presence of chalcocite contributed to the interval intersected between 100 and.    From Wordnik.com.  [Marketwire - Breaking News Releases] Reference

Near surface atacamite, chalcocite and malachite staining is evident in rock exposures.    From Wordnik.com.  [Marketwire - Breaking News Releases] Reference

There are abundant secondary copper minerals on surface, including malachite, azurite, and chalcocite.    From Wordnik.com.  [Marketwire - Breaking News Releases]

In the United Verde Mine, oxidizing conditions at present prevail to the bottom of the chalcocite zone.    From Wordnik.com.  [The Economic Aspect of Geology] Reference

No traces of other primary minerals are present and the chalcocite here is regarded as probably primary.    From Wordnik.com.  [The Economic Aspect of Geology] Reference

Hole SRC060 also intersected chalcocite mineralisation at levels (111m down hole) shallower than expected.    From Wordnik.com.  [Latest News - Yahoo!7 News] Reference

Mixed copper mineralization may contain both chalcocite-covellite and chalcopyrite-bornite mineralization.    From Wordnik.com.  [The Earth Times Online Newspaper] Reference

Samples with conspicuous abundant chalcocite content from the San Antonio mine ore stockpiles ran 6. 2\% to 9. 5\% copper.    From Wordnik.com.  [Marketwire - Breaking News Releases] Reference

The present tendency at Butte is to consider as secondary chalcocite only certain sooty phases to be found in upper levels.    From Wordnik.com.  [The Economic Aspect of Geology] Reference

The interval grading 0. 44\% Cu between 100 and 140 meters contains bornite, in addition to chalcocite, chalcopyrite and pyrite.    From Wordnik.com.  [Marketwire - Breaking News Releases] Reference

chalcocite is largely the dominant sulfide: it has yet to be determined whether the chalcocite is of primary or secondary origin.    From Wordnik.com.  [Marketwire - Breaking News Releases] Reference

The solid masses of chalcocite in the Kennecott copper mines seem hardly explainable as the result of secondary sulphide enrichment.    From Wordnik.com.  [The Economic Aspect of Geology] Reference

Below the oxidized and leached zone there is evidence of deposition of a large amount of secondary copper sulphide in the form of chalcocite.    From Wordnik.com.  [The Economic Aspect of Geology] Reference

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.    From Wordnik.com.  [The Economic Aspect of Geology] Reference

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.    From Wordnik.com.  [The Economic Aspect of Geology] Reference

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.    From Wordnik.com.  [A Text-book of Assaying: For the Use of Those Connected with Mines.] Reference

At the Puntilla, Matilde and Concepcion mines, principal veins were mined at shallow levels for oxide - and enriched (chalcocite) copper ore (P3 - Fig2).    From Wordnik.com.  [Marketwire - Breaking News Releases] Reference

Hana said the main copper minerals in the Southwest fold are malachite and chalcocite, unlike other areas which are predominantly bornite and chalcopyrite.    From Wordnik.com.  [AllAfrica News: Latest] Reference

The primary copper mineral in the limestone is chalcocite, in exceptionally rich and solid masses, showing no evidence of having replaced earlier sulphides.    From Wordnik.com.  [The Economic Aspect of Geology] Reference

While some chalcocite is clearly the result of secondary enrichment from above, other chalcocite seems to have been related closely to the primary deposition.    From Wordnik.com.  [The Economic Aspect of Geology] Reference

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.    From Wordnik.com.  [Marketwire - Breaking News Releases] Reference

The copper mineralization within the upper 300 metres of the deposit includes both supergene digenite-covellite and hypogene chalcocite-bornite replacing earlier chalcopyrite.    From Wordnik.com.  [Marketwire - Breaking News Releases]

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.    From Wordnik.com.  [Marketwire - Breaking News Releases]

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.    From Wordnik.com.  [The Earth Times Online Newspaper] Reference

Recent re-evaluation indicates there may be a sub horizontal cap of chalcocite rich supergene copper to the Sandiego deposit, extending over 200 metres of strike, situated 80 - 100m below surface.    From Wordnik.com.  [Latest News - Yahoo!7 News] Reference

Drilling during April confirmed the presence of a high grade chalcocite cap and has intersected wide zones of massive and disseminated copper and zinc sulphides in four holes in the central part of the deposit.    From Wordnik.com.  [Latest News - Yahoo!7 News] Reference

(chalcocite) minerals can be seen in the samples collected.    From Wordnik.com.  [Latest News - Yahoo!7 News] Reference

A sphalerite - chalcocite zone at 130 - 145m; a sphalerite - pyrite zone at 150-156m and chalcopyrite - pyrite zone at 169 - 173m.    From Wordnik.com.  [Latest News - Yahoo!7 News] Reference

( "chalcocite-covellite zone") where the Company is working to confirm a leachable copper resource, and below this zone to depths of 1,009 metres.    From Wordnik.com.  [The Earth Times Online Newspaper] Reference

"These assay results for the drill holes suggest continuity of the chalcocite blanket at.    From Wordnik.com.  [Marketwire - Breaking News Releases] Reference

Copper occurs as very fine-grained chalcocite.    From Wordnik.com.  [Marketwire - Breaking News Releases] Reference

300 metres of the deposit includes both supergene digenite-covellite and hypogene chalcocite-bornite replacing earlier chalcopyrite.    From Wordnik.com.  [The Earth Times Online Newspaper] Reference

4 chalcocite.    From Wordnik.com.  [Chapter 6] Reference