Technical Report for the Fort Knox Mine - Kinross Gold

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Fort Knox Mine Technical Report11.0 DRILLINGDrilling has been used by FGMI to define mineral deposits in the Fairbanks miningdistrict. Diamond drilling and reverse circulation drilling were the two methods used atthe Fort Knox project. The deposit has been defined by 751 drill holes (307 core holesand 444 reverse circulation holes totaling 492,663 feet), which have provided 98,651nominal 1.52-meter (5 foot) long samples, 97,420 of which were assayed for gold.Figure 11-1 displays the drill hole distribution at the Fort Knox deposit.Figure 11-1: Drill Hole Location Plan – Fort Knox Deposit Area34
Fort Knox Mine Technical ReportReverse circulation (RC) drilling is a specialized method of “rotary” drilling. Drillingmedium consisting of water, foam, drilling mud with additives, or air is circulated to thedrill bit face on the outside of the drill rods. The drill cuttings, which consist of pulverizedrock mechanically ground by the drill bit, are collected through the inside of the rods. Thereverse circulation method is an accepted technique commonly used in mineralexploration and development drilling programs. The reverse circulation holes completedby FGMI are normally 139.70 millimeters (5.50 inches) in diameter, but may range ashigh as 146.05 millimeters (5.75 inches) in diameter.Diamond drilling or core drilling is the process of obtaining continuous cylindricalsamples of rock from drill holes by means of annular shaped rock cutting bits rotated bya borehole-drilling machine. Core drilling is commonly used to collect undisturbed andcontinuous samples. It may also be used for pre-selected intervals of holes that are ofparticular interest. Core hole intervals can provide detailed, comprehensive samples forimproved geologic description, geotechnical and rock strength tests, metallurgical tests,and density determination.The Company has commonly drilled PQ3 diameter core holes (83.1 mm, or 3.270inches) at the Fort Knox deposit since 1998. Prior to 1998, core holes were PQdiameter (85.0 mm, or 3.345 inches in diameter). Both PQ3 and PQ diameter core areused for exploration and evaluation of mineral deposits where a larger sample is morerepresentative of coarse grained gold distribution. The two PQ core varieties are thepreferred sample diameter at Fort Knox because of the local, coarse-grained nature ofgold within the deposit.Core and RC samples are collected from each drill hole and are geologically logged withdetailed descriptions of rock types, alteration, mineral identification, and examination ofstructural features. Reverse circulation holes are sampled on regular 1.52-meter (5 foot)intervals for the entire length of the hole. Each core interval and RC sample is submittedto an independent assay laboratory for geochemical analysis. The resultant geochemicaldata along with the lithologic data is entered into the project database. This drill data isused to construct subsurface geologic maps, cross sections and solids, as well as35
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Technical Report for the Fort Knox Mine - Kinross Gold

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