Diamond Drill Core Logging Sample Clauses

Diamond Drill Core Logging. At the logging facility, the core was laid out, left to right, on tables for examination. The core was oriented up-and-down (toward and away from the viewer), with the shallowest interval to the lower left and the deepest interval to the upper right. Logging tools included bristle brushes & spray bottles (to clean core), protractors, scribes, dilute hydrochloric acid, hand lens, binocular microscope, and logging forms. The logging form includes a logical, visible place to record footage. Each length of core marked off by existing core blocks were marked on the log by drawing a horizontal line across the appropriate part of the log. The footage cut and recovered figure prominently in this record, with entries made for each "box" created by the horizontal lines marking footage. Intervals of no recovery were indicated by horizontal lines crossing the entire page, and a blanked-out zone of 'no information.' Visually, it is instantly obvious on the log what is missing and, perhaps, why. This is an appropriate place to confirm, add or incorporate the RQD data acquired earlier if it is not being maintained in a separate worksheet. The logger pays particular attention to accurately documenting anomalies in footage shown on the blocks, and accounts for missing core by inserting blocks reflecting that, along with a cursory explanation on the block and a more substantial explanation on the log itself. A graphic drawing of the lithology is present, to include major rock types using conventional or agreed-upon symbols, and the major structural features of contact relationships, dip and fractures, accurately plotted as to angle from the core axis. Other details of alteration and secondary mineral suites are added, as appropriate, and a comment area of the log includes a description of the rock that was cut.