From old mine map to exploration target using 3D. Hein Raat, Boliden

From old mine map to exploration target using 3D. Hein Raat, Boliden

• 1.
  From old minemap to exploration target using 3D Hein Raat, Boliden Mineral AB Hein Raat – Zn Exploration Bergslagen 1 2012-10-20
• 2.
  Geodata within exploration • Geological data •Maps •Outcrops and boulders •Drill core, percussion samples •Rocktype, Alteration, Mineralogy, Structures • Geophysical data (airborne, ground and downhole) • EM • Magnetics • Gamma ray (K, Th, U) • Susceptibility, gravity, density, seismic • Geochemistry • Soil and bedrock • Outcrops and boulders • Drill core • Whole rock analysis/lithogeochemistry • Assay data • Various • Geological, ore and block models (3D) • Elevation, topography • Infrastructure, land use, lakes and rivers etc Hein Raat – Zn Exploration Bergslagen 2 2012-10-20
• 3.
  Boliden: Software anddatabase • 2D GIS: MapInfo plus Discover .dxf • 3D CAD modeling and visualization: Bentley’s MicroStation v8(i) • including many in-house developed .mdl applications .dxf • 3D visualization and interpolation: Leapfrog Oracle database (numerical) Hein Raat – Zn Exploration Bergslagen 3 2012-10-20
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  Target generation Exploration strategy • Focus on old (historical) mine sites and surroundings • Old mine maps • Exploration reports • (Possibly) old drill cores and assay data • Geological mapping and sampling of the area • New geophysical techniques  high resolution data and deeper Information source • Bolidens database and archive: 90 years of exploration history • Swedish Geological Survey (SGU) • Exploration package for main mining districts in GIS format • Core and specimen archive • Document archive (maps and reports) • Bergsstaten: Mining Inspectorate of Sweden • Exploration and exploitation permits and issues Hein Raat – Zn Exploration Bergslagen 4 2012-10-20
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  Old mine maps Long sections and profiles High resolution scanned mine maps Legend Level plans including reference frame or local coordinate grid Hein Raat – Zn Exploration Bergslagen 5 2012-10-20
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  Old mine maps Old level plans stitched together (1950ies) • Mine infrastructure inc z • Local grid, reference cross and N-arrow • Drift mapping (geology) • Old drill holes nr and location Hein Raat – Zn Exploration Bergslagen 6 2012-10-20
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  Old mine map digitized mine map Georeferenced Hein Raat – Zn Exploration Bergslagen 7 2012-10-20
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  Digitized mine mapsin 2D All plan views have corrected xyz coordinates All plan views have same ‘layer’ setup Hein Raat – Zn Exploration Bergslagen 8 2012-10-20
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  Digitized mine mapsin 3D You can also include: • (old) drill holes and planned holes • assay data, • outline of known mineralization N Oblique view • down hole geophysical data • geophysical maps All data should have correct xyz coordinates!! • structures Hein Raat – Zn Exploration Bergslagen 9 2012-10-20
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  Digitized mine mapsin 3D Oblique view Only mineralization Only limestone Hein Raat – Zn Exploration Bergslagen 10 2012-10-20
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  Geology and assaydata Geology log Assay results •DH collar, dip and azimuth  exploration report or mine map •Assay data is easy to digitize •Geology: simplify the units you are interested in Hein Raat – Zn Exploration Bergslagen 11 2012-10-20
• 12.
  Leapfrog interpolation Interpolation ofassay data  5 minutes work Hein Raat – Zn Exploration Bergslagen 12 2012-10-20
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  Summary Using3D for visualization of geodata within exploration: • Cheap method for target generation (use of internal data/SGU etc) • Identify potential at depth or missed targets • Identify possible spatial relations • Gives you a head start when logging new holes Digitizing • Be consistent when digitizing • Think about the set-up of your project beforehand, because it is easy to loose control… Hein Raat – Zn Exploration Bergslagen 13 2012-10-20