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• signify a contact or structure. <br />C. A list of the various lithologies and their codes is included in this report. The <br />code is what is entered into the data base and should be put in the lith. code <br />column. <br />ili. PYRITE CONTENT <br />A. Pyrite content, as with other minerals, is best estimated using a visual <br />percentage estimation chart that is available in this manual. This is assuming <br />that the pyrite is visible in nature (ie. individual grains are discernable). <br />B. When pyrite is of the ultra-fine grained type it will impart a variable grey <br />color to the rock dependent on the amount of pyrite contained. There is no <br />conclusive way of estimating the exact amount of this type of pyrite, however, <br />if a rock is a medium grey color due to the pyrite content, the pyrite content <br />is assumed to be at least a 3 on the logging scale. <br />C. If there is a question as to how much pyrite to estimate in a sample, the best <br />course of action would be to consult with the project geologist. <br />IV. K-SPAR ALTERATION <br />A. When logging K-Spar alteration it must be remembered that the majority of <br />' • the rocks in the Cripple Creek District con[ain primary K-Spar and thus are <br />relatively hard. <br />B. As K-Spar alteration reaches the more intense levels (ie. 3-5) the texture of <br />the rock becomes less defined. The grain boundaries will have a ghostly <br />appearance. The phenocrysts will become less distinct with increased <br />alteration. A completely K-Spar altered rack will have a glassy appearance <br />and grain boundaries will be almost impossible to distinguish. <br />V. O~CIDATION <br />A. The degree of oxidation is measured as the percentage of iron-bearing <br />minerals that have undergone oxidation. <br />B. The degree of oxidation is also important in determining expected heap-leach <br />recovery rates. <br />VI. OTHER ALTERATION CHARACTERISTICS <br />A. Other alteration characteristics that must he logged include: sericitic, <br />propylitic, and argillic alteration and the addition of quartz or sulphates. <br />B. sericitic and propylitic alteration are common and in some areas they occur <br />in a halo around the mineralized/altered areas. <br />• C. Argillic alteration is variable throughout the distric[ and is most commonly <br />