Zona Sur
posted on
Oct 22, 2012 02:41AM
Keep in mind, the opinions on this site are for the most part speculation and are not necessarily the opinions of the company WITHOUT PREJUDICE
Below describes the area close to where the ovoid looks like it comes close to the surface towards the Zona Sur area. If you notice in the link below, you will see the original ovoid coming close to the surface, then no more geophysics in the first Quantec phase.
http://s3.amazonaws.com/s3.agoracom.com/public/photos/images/4884/large/ScreenHunter_07_Dec._07_07.38.gif
Nevertheless, it appears to me that the alteration mentioned in the 2008 tech report below may be responsible for the southern end of the ovoid signature. If this is the case, then there should be long lower grade assay results from holes that may have been drilled there, and don,t forget to add in the veins, with average grade of ~16 g/t that belong to the S2 swarm and are laid in the low grade alteration. The chart at the end of the post didn,t come out right, but for the Zona Sur is 53 samples, averaged gold grade of .35 g/t over an average width of 4.3 m, this is only the diseminated gold and the veins are not included in this. It is interesting to see how the grades shoot up in an alteration zone with little quartz veinlets closer to the ovoid in the S-1 area of, grabs across 27m averaged 1.74 g/t. This looks pretty interesting on lines of 2750 and 3000 of the 2010 geophysics in the tech report.
IMO
The northern half of the S2 swarm is hosted in propylitically altered sheared and brecciated diorite. Thirty-three trench samples were taken from this alteration zone, but most samples returned less than 50 ppb gold. However, several trench samples collected immediately adjacent to veins returned anomalous gold. For example, at the northernmost end of the swarm, sample 253401 assayed 39.6 ppm gold across 1.1 meters. Immediately east of this, sample 253402 gave 1.02 ppm gold across 3.4 meters. Further to the south-southeast, trench sample 253403 assayed 2.26 ppm gold across 0.9 meters. About 150 meters to the southsoutheast of this, sample 562669, taken of altered diorite between veins, assayed 7.48 ppm gold across 2.0 meters. In view of these results, additional sampling of wallrocks immediately adjacent to and in between veins of the S2 swarm is warranted. The northernmost part of the S1 vein is exposed in a small window of diorite poking through surrounding volcanics. Within this window, an unusual style of quartz veining was observed in what was initially interpreted as subcrop. Veining occurs as knotty “blowouts” and micro stockworks of milky quartz in muscovite-bearing diorite. Grabs of this material across 27m assayed 1.75 ppm gold in sample 253259. This assay was confirmed by a check sample of the rejects. However, the outcrop source of this material was not encountered in the three deep trenches that were excavated at the site of sample 253259. It can only be concluded that the interpreted “subcrop” is actually transported colluvium, and that the source outcrop may be buried beneath the volcanics.
Table 5 below summarizes results from 104 trench samples collected mainly within propylitic alteration zones associated with many of the veins in the structural corridor (One sample grading 39 g/t Au is omitted so as not to scew the data. There was probably unnoted veining within this sample). The table shows that although there is anomalous gold within the propylitic alteration zones, concentrations are not of economic interest at the present price of gold. TABLE 5: SUMMARY OF ALTERATION ASSAY RESULTS
Area Samples Avg ppb Au Avg width m Canchete
350x480 4 170 4.75
Central
1000x1200 47 230 3.3
Sur
950x1100 53 320 4.61
Incognito
1200x2600 0 na na
Other
Na 0 na na