A geophysical correlation
posted on
Apr 08, 2011 10:47PM
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
I would like to use exceprts from Galway Resources NR today to maybe help us in understanding the value of our own geophysical. They have recently done a geophysics over their existing mine, it is an old shallow mine, approx 250m deep. I will post excerpts below, then discuss each one directly afterwards a bit, entering my opinion and any relation to SLI.
1)The high-grade nature of the veining is indicated by the average sampled grade for both levels is 29.4 g/t gold plus 45.9 g/t silver over a total of 614.7 meters of veining, together with an additional 172 meters of veining that has already been mined.
1)So, OK, these are chip samples taken within the mine that had geophysics done over it. They are real high grade, as you can see, take note that this is an average of all samples and that some samples contained no gold.
2)IP/MAG Geophysical Surveys
In January 2011, Galway retained KTTM Geophysics of Medellin, Colombia to complete an Induced Polarization (IP) and Ground Magnetic (MAG) survey over the geology grid on the Vetas Project.
Results show that the main mine trend has strong chargeability anomalies at moderate depths below surface (starting at ~30 meters). These chargeability anomalies are coincident with the high MMI gold response ratios and surface structures mapped over the main mine trend. In addition, there are a number of other chargeability anomalies outboard of the main trend that are also fairly deep on the IP profiles (30 to 60 meters). These chargeability anomalies are either associated with gold MMI anomalies and veining/faulting on surface, or with intrusive lithologies and stronger base metal (Cu-Mo) MMI signatures. Increasing pyrite mineralization with depth (noted above) may be the reason for stronger chargeability noted deep on the IP profiles.
Future surface drilling should focus on deeper targets in favor of shallow targets based on the deeper chargeability anomalies seen in the IP survey. Drilling will begin with a 5,000 meter underground diamond drill program, testing the mineralization open below the high-grade Reina de Oro Level.
2) So, they are getting strong chargeability anomalies, does this sound familiar? They say;" Increasing pyrite mineralization with depth (noted above) may be the reason for stronger chargeability noted deep on the IP profiles." then say in a sentence before that; "Sampling also generally shows stronger grades with depth." If you look in the table in the link provided, you will see the stronger grades came from the deepest part of the mine.
http://www.galwayresources.com/s/NewsReleases.asp?ReportID=450829&_Type=News-Releases&_Title=Galway-Resources-Announces-Start-of-Drilling-and-Exploration-Update-at-its-...
The information provided by the company has gaps in it and it makes it hard for a direct comparison of gold and anomalies. But, I beleive the hints are in this NR that there is confidence and some proof in the geophysics. It appears that the company will focus on the anomalies, and if the near surface ones contain gold, this shaft mine may become an open pit. Because they followed a vein structure into the the side of a slope and as they got deeper, there is probably gold above their heads that they didn,t know about.
Now, I called their management , but couldn,t find out how deep their geo survey reached, but assume most are 500m depth. There are no pretty slides available to look at, and may not be in the future (because they give away secrets, IMO) but I expect the slides must show mineralization/anomolies at depth also ,for them to be drilling inside the mine deeper. Telling me that they are confident in the geophysics.
This long post to show something that could have been said in one sentence.
Geophysics works and correlations are being revealed everyday as I beleive the Tesoro geophysics will be proven.