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Gold/Mining/Energy : Sierra Nevada Gold - SDD.vse
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To: rdww who wrote (46)7/8/1999 10:02:00 AM
From: rdww   of 65
 
FWIW - found this note on another thd about copper - seems like we have a similiar problem with the Promontorio - a high grade shoot that was assaying 35% Cu. To start production at Promontorio - the deposit would start witht he 10% Cu in order to get a quick payback. Sounds similiar to the mine described in the article. BUT the deposit that SDD has is an energite system and they usually go quite deep and the only hole so far that was done in the chimney pipe was where the 34% core came from. Looking fwd one day to seeing this drilled out.
Still working on getting a drill working, permits + cash for the Az property. This property is the type of Gold property that can still make money producing today. High grade veins that are of a mineable width are still the best bet to staying in Au production. Let's hope that we can find out one day!

"Copper occurs most commonly as Chalcopyrite, a sulphide mineral of copper and iron. Chalcopyrite is by far the most important ore of
copper, commonly found in deposits associated with other sulphides or disseminated through igneous rocks.A chemical analysis of pure chalcopyrite shows that the mineral is made up of 34.5% copper, 35% sulpher, and 30.5% iron. Theorectically the highest copper content possible in Chalcopyrite ore would be 34.5%.Such a content only occurs in nature in individual mineral crystal, however. Unfortuntely chalcopyrite is not found in commercial quanities in this concentration. A 10% copper ore is considered very high-grade. A deep copper zone at the Strathcona mine in Sudbury, Ont, for example, contains 3.4 million tonnes at a grade of 9% copper. Copper, too, is
occasionally found in the native state meaning 100% pure.
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