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Message: Massive Sulphides
A look at the Oct 23 2007 news release, has SLI talking about massive sulphides. Now these massive sulphides were encountered at around the 74m level of the mine shaft on the C-1 Vein. This is the extent of the oxidization to depth and then it turns to the purer mineralization from the 74m level deeper. The gold grade remains consistent in the vein meaning that a sample can be taken of the vein anywhere and have a grade of around 1 ounces per ton gold average in this depth range, individual samples are seen to run as high as 6.5 ounces gold thats been reported on in the C-1 vein.
The interesting stuff starts now, below, in the provided excerpt from the news release, you will see that the gold grade increases in the massive sulphides. You will also notice that the silver and copper composition of the massive sulphides also increases, and to handsom grades, I might add. The silver component assayed from one select sample as high as 2.44 ounces, and the copper grade of that sample, a whopping 5.59%. So you probably have 6-8 % sulphides at least when you factor in the other components of sulphides present, being pyrites,arsenopyrites,iron, etc. So, massive sulphides give off a high chargeability signature on geophysics. Without drilling or sinking a shaft in a high chargeability anomaly that geophysics may show, you have no idea of the mineral composition, for example, the high chargeability could be an iron deposit, BUT in our case, we have a 100m mine shaft in one of the spurs that hook up to the anomaly that tells us the composition of high chargeability given off by the Quantec, and this shaft tells us its high grade gold,silver and copper encapsulated in the sulphides.
If you look at the Quantec slide L5750N from the 2010 technical report of the Tesoro, and plot the C-1 mine shaft on this image, you will see that at the 80m level we are getting an orange signature of high chargeability, and this continues on to link up with the big anomaly deeper at around 250m below that, where the chargeability rises much higher yet. Also take note of T-18 on the resitivity slide of the same numbered slide, at that target, you see an off the charts resitivity high that just happens to be the same signature resitivity of the anomaly, only this resitivity high is very close to our massive sulphides, which increased at depth, probably only 20-30 meters below the 100m level of the C-1 vein. You can clearly see the C-1 vein getting wider on the geophysics, with a little explosion at the 150m level or so, then it connects to the giant anomaly below that at another 150m or so.
So its not very hard to see that the anomaly could easily consist of sulphides that has a composition of possibly 1 ounce per ton gold, 2 ounce per ton silver and 3% copper. But its my belief, by looking at the facts above, that the grades could be considerably higher. And to see some 500m drill holes went into similar anomalies and what appears to be parts of the anomaly, with no results below 275 m approx in these areas, leaves a lot of unanswered questions. And especially when you remember that the granodiorite is mineralized to extents above 1 g/t gold in places as well.
{The shaft is currently in a transition zone from oxide facies to sulphide facies. Two select
samples of massive sulphides were taken from approximately the 74m level in the shaft and
assayed for gold and other elements in order to see if the gold content increases, diminishes, or
remains the same in the sulphide-rich vein material relative to the oxide-rich material. Assay
results, listed below (both from the sulphide zone), indicate that the gold content increases in the
sulphide-rich material and that the material is also enriched with silver, copper and tungsten.}
IMO
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