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juliusmall

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About juliusmall

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  1. Alluvial Diamond Deposits

    Usually they are more..... In happy cases, from the state...Otherwise, a militia....
  2. Alluvial Diamond Deposits

    Hi Paolo, Remember from my text: "collect around 200 l of alluvial, concentrate by panning, then carefully observe the heavy minerals associations". I saw some papers telling about 100 kg (the minimal I think). We were more conservative and prudent in some projects. It is a large quantity; depending on on the pan size, at least 10- 20 pans to wash. Finally, depending on the area, you will obtain some hundreds of grams of heavy minerals; among them, a lot without significance, like magnetite. And then, in less quantities: pyrope and eclogitic garnet, chrome diopside, picroilmenite, chromite; and, to a lesser extent, olivine . The indicators. These are the indicators about a kimberlite body. The kimberlite is decomposing fast and will leave this mineral traces in the alluvial, but diluted with other minerals, depending on the distance. It is what you are searching. Personal (from some sustained field experience, and also a lot of study for Remote Sensing or GIS) I don't think that you can discriminate those minerals, in such small quantities, basis on remote sensing, in alluvials. To few, in order to have a significant spectral signature. See an article, about the kimberlites* As a good help, starting from the satellite data, you can do a geomorphological analysis. Discriminate well and precise the hydrographic network, then to locate some favorable areas (terraces, dejection cones), for heavy minerals concentration. Among them, beside the indicators, you can find, or not, diamonds (3.52 SG). It is what I done, in my projects. Not Angola, but nearby. Then, to start exploring, as I wrote before, on the ground. Or direct mining, with the risks of acquiring heavy equipment and be without enough reserves. I don't know if you have an exclusive license; if yes, can you send me the coordinates, in order to see what it is available (satellite) for that area ? If you are prospecting, and the area is confidentially, please send something like an nearby area, one-two hundreds kilometers distance. They are some new satellite data and I want to see the confidence, if you are agreed. Regards, Iulian * http://www.hgimaging.com/PDF/Kruse_IEEE2000_Kimberlites.pdf "Higher spatial resolution data (1.6m AVIRIS and 4m HyMap acquired in 1998 and 1999, respectively) are being used to map additional detail. Poor exposures, vegetation cover, and weathering, however, make identification of characteristic kimberlite minerals difficult except where exposed by mining. "
  3. Alluvial Diamond Deposits

    Hi Paolo Are you asking (or your employer) miracles from remote sensing, and especially with free resources, like LandSat. Have you check the cloud coverage in your target area ? You can identify only favorable areas (alluvial fields like meanders, cone shapes, etc). At the Landsat resolution will be difficult..... Then, quatre quatre pieds, meaning foots on the ground and sampling. It is a long process painful lounge and expensive: collect around 200 l of alluvial, concentrate by panning, then carefully observe the heavy minerals associations. A lot of samples like this...... Observation there in the field and also in specialized and expensive laboratories (they are experts specialized in heavy minerals microscopy). I am sure you know all these..... You can have/or not diamonds, or kimberlite indicator minerals. Keep in mind that perhaps only one of ten kimberlites bodies is "pregnant" with diamonds Regards, Iulian
  4. Why should someone buy MapInfo?

    @Capricorn Perhaps you haven't understand. I am not giving data to other to post processing. Just sending people to work in the field according to our goals. I suppose also your urban planing layouts are put in place by some people, starting with the architects, engineers etc and finishing with the last shovel guy. I am returning to the definition: GIS.... Geographical Information Systems. That System from the end is including far, far more than a collection of maps, layouts, etc. ArcInfo maybe it is ended far more powerful, full of analyses capabilities, etc. But it was started on exclusive Unix machines. At ESRI they recovered slowly, migrating late, during the end of '90 to Windows machines. But as you said, we have only the core. Nothing to go, lets say, beneath the the surface. Of earth, water..... @batiporky Low technical users, loosing market ? I know some attempt of ESRI to enter on specialized markets...... and..... So: Exploration, mining: MapInfo/Discover (they are all now, ENCOM-Discover-MapInfo at the same company), Surpac, Vulcan, MicroMine Oil (exploration-production): Petrel, Kingdom Geophysics: Geosoft, Surfer Engineering: Underground water, foundations, etc Just count the possible business figures and try to find the ArcGIS or QGIS corespondent modules. Also, you will discover that they are a lot of highly specialized "low level" experts working in multi trillions industries....... Successful, with high tech results..... and without ArcGIS or QGIS. As I wrote before, beware to what you are targeting, to the appropriate software.... and to the GIS definition
  5. Why should someone buy MapInfo?

    I can tell that MI+Discovery is an essential tool in the exploration and mining industry. Example: I can generate in less than a hour a grid for soil geochemistry and in the second hour to load in the GPS units the coordinates and send people to work. No such module in Arc. And they are a lot of such specialized modules in MI/Discover It is not about the core MI vs Qgis,it is about the final products. Same in geophysics, you will never find Qgis or Arc, you will find products processed in Geosoft..... Same in the oil industry. Other families, not Qgis or Arc So, see what you are targeting......
  6. Problem with Aster image

    I converted one time a grid in an ers format and the altitudes were exploded. In which step do you have these inflated elevations ?
  7. Probably is expensive: http://www.photosat.ca/mapping-services/30cm-accuracy-topography-mining.php?&utm_source=infomine-mining-com&utm_medium=web-ad&utm_campaign=mining-com-world-map
  8. different WGS84 implementations ?

    Forget. A lot of Garmins are using also a barometer sensor. The 72 I think, it has a menu for skydiving...... But on a tablet is different of course
  9. different WGS84 implementations ?

    Using a GPS, a Garmin 62sc on a boat near the shore: the error was less than 6 m. Error in theory, because they are other factors also: tide, the error of GPS system itself...... Place: Africa, 2 degrees south from equator
  10. You can try ecw compression format. It was real increasing the speed. Some simple thinks, digitizing large scanned maps. But the speed of redrawing was real fast after compression. Your software must support the ecw format Regards
  11. MapInfo news

    I think W32 is a dead end...Only 3.something gb memory used by the system, So, only an office Pc or something. The most interesting for me is the multi core capacity
  12. MapInfo news

    From somewhere, from internet: Tom Probert MapInfo Professional Global Product Manager I'm happy to report that a good portion of what you are asking for is on the way in MapInfo Professional v12.5. This is going to be a transformational release. The key pillars are (1) a full 64 bit version will be available. (2) An all new Layout Designer (similar to the Legend Designer) complete with an "active" Layout window. This means you can manipulate the map directly within the layout and do not have to go back and forth between the map and the layout. (3) Use of multiple cores and multiple threads for object processing operations and (4) the 64 bit version will have an all new ribbon based user interface. The 32 bit release will not have the ribbon user interface but will have the new Layout and multiple core support. If you can make it to one of our MapInfo Tour events, we have very early builds of the 64 bit release that we are showing. To be clear these are not beta (not even alpha releases)We will be putting the new release on display at MapInfo User Conference in Memphis.
  13. Beside the precision problems, ASTER is full with artifacts, gaps, etc. I suspect that is working bad in the areas with clouds. I think I remember T is for thermal reflectance. Sure in my work area, near the equator ASTER has problem. Use SRTM as basis and ASTER if is a place without artifacts. An yes, it is an elevation difference.
  14. PrimoCache

    Hi everybody, maybe you go to find useful I am making a map in Map Info. Huge, a lot of layers, included contours at 5 m. I am using what I think it is a strong laptop. I7, 16 GB memory, a SSD disk. But MapInfo is still hanging often, meaning when I select a contour I must expect time to time over 10 seconds to fulfil the command. Same for redrawing and others. I just install software, PrimoCache. It is doing something like an extra cache for the disks, outside of windows normal buffers. Everything is working faster now included other jobs. Mapinfo especially. The software is a shareware with a generous trial, 90days. Maybe will be useful; also for other GIS Regards www.romexsoftware.com/en-us/primo-cache
  15. 32-bit or 64 ?

    Forget to mention, thanks to the people of LavTeam
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