If there is a sharp contact, mark the angle of the contact and note and alteration. endstream endobj startxref Geophysical logging of the hole created in the drilling process is sometimes done without the collection of the core. It may be the same rock type but its harder, or a slightly different colour. In addition, the cardinal directions (N/S/E/W) may not actually be as mine grids tend to align themselves along known geology or features. Drilling and logging are to determine the in-place condition of the soil or rock mass. Features) /Next 320 0 R /Prev 324 0 R /Parent 311 0 R /A 325 0 R >> endobj 323 0 obj << /S /GoTo /D [ 171 0 R /Fit ] >> endobj 324 0 obj << /Title (Format and Required Data for the Final Geologic Log) /Next 322 0 R /Prev 312 0 R /Parent 311 0 R /A 326 0 R >> endobj 325 0 obj << /S /GoTo /D [ 168 0 R /Fit ] >> endobj 326 0 obj << /S /GoTo /D [ 7 0 R /Fit ] >> endobj 327 0 obj << /S /GoTo /D [ 310 0 R /Fit ] >> endobj 328 0 obj << /Type /Font /Subtype /TrueType /Name /F0 /BaseFont /CenturySchoolbook,Bold /FirstChar 31 /LastChar 255 /Widths [ 750 287 296 333 574 574 833 852 241 389 389 500 606 278 333 278 278 574 574 574 574 574 574 574 574 574 574 278 278 606 606 606 500 747 759 778 778 833 759 722 833 870 444 648 815 722 981 833 833 759 833 815 667 722 833 759 981 722 722 667 389 606 389 606 500 333 611 648 556 667 574 389 611 685 370 352 667 352 963 685 611 667 648 519 500 426 685 611 889 611 611 537 389 606 389 606 750 750 750 241 574 481 1000 500 500 333 1000 667 333 1000 750 750 750 750 241 241 481 481 606 500 1000 333 1000 500 333 907 750 750 722 287 296 574 574 606 722 606 500 333 747 367 500 606 333 747 500 400 549 344 344 333 576 747 278 333 344 367 500 861 861 861 500 759 759 759 759 759 759 981 778 759 759 759 759 444 444 444 444 833 833 833 833 833 833 833 650 833 833 833 833 833 722 759 611 611 611 611 611 611 611 870 556 574 574 574 574 370 370 370 370 611 685 611 611 611 611 611 549 611 685 685 685 685 611 667 611 ] /Encoding /WinAnsiEncoding /FontDescriptor 329 0 R >> endobj 329 0 obj << /Type /FontDescriptor /FontName /CenturySchoolbook,Bold /Flags 16418 /FontBBox [ -250 -214 1200 964 ] /MissingWidth 750 /StemV 167 /StemH 167 /ItalicAngle 0 /CapHeight 964 /XHeight 674 /Ascent 964 /Descent 214 /Leading 203 /MaxWidth 1000 /AvgWidth 524 >> endobj 330 0 obj << /Type /FontDescriptor /FontName /CenturySchoolbook /Flags 34 /FontBBox [ -250 -213 1200 987 ] /MissingWidth 747 /StemV 85 /StemH 85 /ItalicAngle 0 /CapHeight 987 /XHeight 690 /Ascent 987 /Descent 213 /Leading 200 /MaxWidth 1000 /AvgWidth 467 >> endobj 331 0 obj << /Type /Font /Subtype /TrueType /Name /F1 /BaseFont /CenturySchoolbook /FirstChar 31 /LastChar 255 /Widths [ 750 278 296 389 556 556 833 815 204 333 333 500 606 278 333 278 278 556 556 556 556 556 556 556 556 556 556 278 278 606 606 606 444 737 722 722 722 778 722 667 778 833 407 556 778 667 944 815 778 667 778 722 630 667 815 722 981 704 704 611 333 606 333 606 500 333 556 556 444 574 500 333 537 611 315 296 593 315 889 611 500 574 556 444 463 389 611 537 778 537 537 481 333 606 333 606 750 750 750 204 556 389 1000 500 500 333 1000 630 259 1000 750 750 750 750 204 204 389 389 606 556 1000 333 1000 463 259 833 750 750 704 287 296 556 556 606 704 606 500 333 737 334 426 606 333 737 500 400 549 333 333 333 576 606 278 333 333 300 426 833 833 833 444 722 722 722 722 722 722 1000 722 722 722 722 722 407 407 407 407 778 815 778 778 778 778 778 606 778 815 815 815 815 704 667 574 556 556 556 556 556 556 796 444 500 500 500 500 315 315 315 315 500 611 500 500 500 500 500 549 500 611 611 611 611 537 574 537 ] /Encoding /WinAnsiEncoding /FontDescriptor 330 0 R >> endobj 332 0 obj << /Length 333 0 R /Filter /FlateDecode >> stream It is fair to say that in most drilling programs using oriented core, the alpha-beta method is now the technique of choice from the very first exploration hole through to final ore definition drilling. Even many apparently tight joins You may need multiple passes to divide and mark-up the core lithology properly. (Vertical and horizontal error usually vary greatly with horizontal much more precise than verticle. In this case, with potential mining widths in mind you may want or need to sample potential rock between zones. Structures can now be measured with a geologist’s compass in the usual way. The frame permits direct visualisation of structures in their original orientation, and allows them to be measured in terms which have geological meaning at the time they are made. This is especially true in vein style gold deposits as we have here in NW Ontario. endstream endobj 966 0 obj <>/Metadata 68 0 R/Outlines 84 0 R/PageLayout/OneColumn/Pages 959 0 R/StructTreeRoot 161 0 R/Type/Catalog>> endobj 967 0 obj <>/Font<>>>/Rotate 0/StructParents 0/Type/Page>> endobj 968 0 obj <>stream BQ core (smaller) tends to still be used for some exploration as the drills are smaller/lighter, it still provides an OK sample size and is relatively cheap to drill. Now when the drillers tag the meterage, they are doing so by sight – mistakes do happen. Marking off a sample is done in an easily distinguishable marker/crayon and should cover the mineralized envelope as well as contact areas. They then elevate the drill head so that the drill is angled at the correct “Dip”. h�b```�&��� cb�,�@F���,���7���(P�S�a��r0m��� FOx��%77����!H@C��#�eyG[zFZYz��T�9\vl�����υ���-��R� A logging provider displays or stores logs.

The alteration of the right type usually will denote mineralization and ore zones. Lest I be thought biased, I must point out that the internal core angles method of measuring planar structure in core does offer some advantages over using a core frame: [1] As alpha angles increase, the ability to measure an accurate beta angle decreases. �D,�U5>@"�����9�b``$���O�@� �y +

Core logging is the systematic recording and measuring of as much information as possible/required to determine the lithology (rock types), mineralogy, potential geological history, structure and alteration zones through a tiny piece of cylindrical rock drilled and removed from a potential mineral deposit. Unless you are in completely unexplored area there should be some report, field work or map which gives you an idea of what rock types you will encounter.

These contacts will be sharp or gradational, choose symbols to denote gradational or sharp contacts. Logging techniques are extremely useful, dependable, and accurate for lithologic identification, formation evaluation,… If recording Rock Quality Designation (RQD) – this will have already been done for you by a technician. At the end of every drilling run, the driller brings the core inner- tube to the surface to empty. 965 0 obj <> endobj What you are logging is any time there is a change – mark it. No drill core is perfectly straight. The shown locations are exact GPS coordinates (to within 50cm) of the actual hole.

This number processing can also be done manually using a stereonet. All drill records will have an azimuth, dip and length recorded – these are values needed to actually drill the hole. Physically measure locations introduce error (topography changes primarily) In this case hole 86-4 is off by approximately 5 meters. Considered the primary method of determining grade, size and mineability of a potential mineral deposit drill cores are relied on by exploration and mining companies around the world. The beta angle is the angle between the Bottom of Hole (BOH) line and E. This measured around the core circumference in a clockwise direction when looking down the hole. A potential sampling area, usually denoted by a mineralogy and alteration change, is made up of three parts. Generically you should have WAAS or DGPS turned on (Increases accuracy), have at least four satellites and note the GPS rendered error. In short, Core Orientation Frames are GEOLOGIST FRIENDLY. Their logs are highly detailed and this type of logging is a must for new logging areas without well defined ore zones. endstream endobj 1332 0 obj <>/Metadata 55 0 R/Outlines 73 0 R/PageLayout/OneColumn/Pages 1326 0 R/StructTreeRoot 134 0 R/Type/Catalog>> endobj 1333 0 obj <>/Font<>>>/Rotate 0/StructParents 0/Type/Page>> endobj 1334 0 obj <>stream Silicification and sericitic alteration tend to be the go to alteration in Beardmore/Geraldton Gold, with a specifically altered iron formation being the go to ore body at Musselwhite mine. Each and every sample should be individually logged as per primary/secondary mineralization, grain sizes of minerals, habit of minerals, percentage of minerals as well as alteration, colours and of course veining if appropriate. Other articles where Core logging is discussed: well logging: Core logging is a highly specialized skill requiring careful observation and accurate recording. Record dip, azimuth and downhole surveys/intervals in the header of the log.

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