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Gold/Mining/Energy : BET YOUR ASSAY - Mining Terms Explained -- Ignore unavailable to you. Want to Upgrade?

To: POLARBEAR who wrote (351)	3/8/1998 3:39:00 AM
From: POLARBEAR	Read Replies (1) \| Respond to of 463

Extractive Metallurgy Division mintek.ac.za

To: POLARBEAR who wrote (351)	3/19/1998 10:03:00 AM
From: Walt	Read Replies (2) \| Respond to of 463

Been out of town for awhile so just getting caught up on things. I was hoping a geophysist would jump in to answer this one cause it is fairly complicated. Basic geophysics: you take a machine (magic black box) which measures something about the earths crust and you do a survey over a piece of ground. The more readings you take with the instrument the more detailed the survey. The results are then put onto a map the data is manipulated a bit and tthe results usually contoured. This gives you highs and lows. A geophysical map on its own is interesting but becomes much more valuable when it is superimposed over a known geology map. Pyrrhotite and magnetite are you two magnetic minerals so if they are around you get a strong magnetic response. Also different rock types will often have slightly different magnetic responses. 1. A magnetic low, over a bedrock occurrence of massive sulfides, containing rich zinc values, with associated copper, lead and silver, continues to the northeast, along the presumed line of strike. The magnetic low is to be drilled. What they are saying here is the mag low seems to correspond to a known sulphide occurence so they plan to drill along strike to see if the correlation continues. When you have a anomaly either a high or low which correlates to a known geological feature then its not a bad quess that if you follow the anomally you will also follow the feature. 2. A prominent 1.0 milligal gravity anomaly, 200 feet west and 300 feet south of an ultramafic copper-nickel bearing pyroxenite dyke, to be drilled. Gravity surveys measure the density of the crust so they have something that is denser then the surrounding rock and they want to find out what it is. It might be significant or it might not. 3. A coinciding magnetic and V.L.F. electromagnetic conductor, in an area of extensive occurrences of copper and gold bearing sulfides, to be drilled. Here they have something which is magnetic and also conducts electricity (VLF survey) usually these are sulphide zones of some sort. VLF stands for very low freguency signals which are sent through the ground and picked up by an instrument, if the ground is conductive the signals get distorted. I have mixed feelings about VLF surveys they are cheap to run and do give you some idea of what is going on but they tend not to be very accurate. If you are really onto to something a more detailed and accurate EM survey should be run. 4. In an area of relatively strong sulfide mineralization, in the northwest sector of the 2 mile square claim group, numerous V.L.F.-E.M.conductors, coinciding or associated with magnetic anomalies, outlined. The strongest E.M. conductor strikes east-west, for 1200 feet, associated with a magnetic low. The conductors to be selectively drilled. Again they have a series of anomalies, something which is conductive but not magnetic which they want to test. 5. A deep seated gravity anomaly, in adjoining MacBeth Township to be drilled. A deep seated gravity anomally is some mass of rock or intrusion which didnt make it to surface. Whats it all mean. Well it sounds like they have an area with some known showings or zones on it so they ran the geophysics and now have said lets drill test the various types of anomalies we have to see what is causing them. Hopefully the drilling will help unravel the geological setting of the area and they will be able to zero in on the most interesting zones. Hope that helps some regards Walt