To: Dan P who wrote (9013 ) 2/8/1999 3:13:00 PM From: Mike Gold Read Replies (1) | Respond to of 25548
Notes on the IP Report-Lipangue: I completed review of the IP section and the rest of the House report. Interesting...Here's a few of my notes/conclusions a) Rocks in areas West and East of the breccia pipe(western and eastern edges of plateau have been propyliticly altered. Rock typically have low level alternation at the margins of a porphyry system. Rocks in the area of the pipe have been phyliclly altered. This high level of alteration is consist with rocks directly adjacent/above porphyry systems. b)Grap samples of the float material/top of the pipe show some gold/copper/silver/lead etc. These samples indicated that gold is present in this porphyry system. Grap samples are not a quantative indication of the amount of gold in the system-just used as an indication on whether gold is presence. Assays values where relatively low. c)”In relationship to the Resistivity, it is convenient to say that in general, the different types of rock do not possess a characteristic level of Resistivity, since it depends mostly on the amount of fracturing and alteration which occurs, and on the amount and quality of the electrolytes present in the intrstitial pores, and on the particular properties of the bedrock.” “In the study area it is possible to clearly identify the presence of reistant bodies (Resistivity of more than 500 ohm-m) differentiated in each profile, which indicates silicification of the rock, in the adnesitic rock as well as in the grandiorite of the East section of the study zone. “ So values above 500 means when have quartz-nice indicator of gold d)”In the phase section (2d inversion) of the E, F and G profiles it is possible to observe a polarized body between the 600m and 800m stations of the profile net, which is located approximately at a depth of 50 meters in profile E, deepening to the east and locating at 100 m depth in profile G. This polarized body, possibly associated with sulphide minerlization, would be related to the quartz-limonite breeica recognised in this sector.” “The phase anomaly outlined on Line E displays the “pant leg” anomaly shown by classical porphyry deposits and is complimented by the Resistivity profile which shows high resitivity to depth under Station 600, the center of the breccia pipe. the interpretation of these profiles.....shows a phase anomaly up to 40 times background with an associated resistivity anomaly of high resistivity with a preferred orientation to the north of the breccia pipe”. This says the pipe is made out of quartz-it has lots of metal in it! The depth of main showing is at 50 meter and beyond at the center-then becomes deeper as you move to the East of the pipe. It is at least 200 meters wide by at least 400 meters long-unlimited to depth. The depth of the IP can sense in this survey is 200 meters down. e) “The section of Resistivity of profile A (Western fringe of the survey area-1/2 mile West of pipe..) shows a resistant body between the 400m and 1,100m stations. In the phase model-polarized bodies are observed between the 600 and 800 stations....” This means the survey shows a hunk of metal associated with quartz along the Western fringe of the plateau. The metal might just be magnitite or perhaps gold-House is unsure if this area is related to the pipe or not. Areas between the Western fringe and the pipe show nothing to a depth of 200 meters. The conclusion being if this anolomly is associated with the pipe-then there is minerlization extending between the pipe and the Western fringe at depth but not near the surface. The breecica zone strike goes directly towards the metal anolomalies which is higly suggestive of a connection. f) “Another polarization anomaly is located between the 500 and 900 stations of profile I, which is located in the extreme east of the study area. This polarized anomaly is related to medium resistant rocks, which correspond to the grandoiorite of the area. The polarized bodies which are anomalous possibly correspond to sulphide mineralziation and are generally located at a shallow depth, 50m or less, and are associated with bodies of geoelectrical Resistivity, possibly silicified breccia such as the one recognised in the central section of the area of study, stations 600 and 700, profiles E and F.” Looks like pipe/porphyry extends all the way to the edge of the plateau to the East as well at depth. g) I conclude that the porphyry deposits extends well East and West of the pipe at depth. This would give the porphyry a width of upto 1600 meters W to E and about 200 meters North to South at depth. Surface expression is 200 meters by 400 meters. h) No reason was given why the pipe/porphyry extends W to E-in a narrow fashion-no mention of what the geologic structure is-ie fault line etc. I) IP lines are in a grid. They are named A,B,C,D,E,F,G,H,I. They run S to N. Each line is 200 meter E or W of it neighboring line.. The pipe is at the center of the grid. Station 600 on Line A would mean 600 meters North of the extreme SW corner of the grid system. Line I is one the extreme East side of plateau. j) For those of you who have a copy of the report, I can clue you in on how to read the IP's charts if you are having trouble reading them. Send me a note if interested. Most of the discussion is beyond the reading audience on this thread.