Improvement on grade. WHAT IS THE TRUE WIDTH* MORE SELLING*The Lexington-Grenoble Deposit The copper-gold mineralization associated with the porphyry intrusion on the Lexington, City of Paris and Lincoln Crown Grants (aka the Grenoble deposit) consists of 13 shallow-to-moderately dipping (between 20° and 35°), sub-horizontal sulfide lenses. Semantically, the lenses are interchangeably termed blocks, domains and/or zones in the Technical Reports.
Each zone is composed of veins, veinlets and disseminations and 90% of the mineralization is hosted in the dacitic unit adjacent the contact zone with the Lower Serpentinite unit. It is interpreted that two separate magmatic-hydrothermal geological events contributed to the mineralization associated with the dacite-lower serpentinite sequence:
1) porphyry copper-gold fluids invaded this structural setting from below, concentrating gold-copper mineralization at the structural traps formed at the base of the dacite units
2) a second phase of epithermal sulphide-gold deposition occurred later, depositing additional mineralization in the structurally-controlled areas along the dacite-serpentinite contact zones
To-date, the discovered gold veins emplaced in serpentinite bodies have been small, but are often high grade.
Based on 54 surface and 48 underground diamond drill holesxxvi, in 2004, Gold City interpreted the series of eight lenses to be en echelon overlapping zones hosted within the dacite unit and named the individual grade lenses as A-, A , A, A+, B-, B, B+ and C with A- beginning at the contact point of the dacite and Lower Serpentinite unit with A , A, A+, B-, B, B+ and C proceeding upwards into the dacite unit.
The zones range from 1-to-24 meters in thickness (though most are between 1 and 6 meters and appear to average 2.5 meters).
The A and B tranches have higher grade mineralization since the thickness and density of the veins decreases gradually into veinlets and disseminations as the mineralization progresses into the dacite unit.
In 2005, three other zones were added (Z-1, Z-2 and Z-3), along with the TG-81 zone (150 meters to the north of the Grenoble deposit), which extended deposit s strike length from 375 to 525 meters. Also in 2004, the first phase of drilling program extended the plunge length of the Grenoble deposit by 30%.xxvii
Today, utilizing subsequent drilling results, the Main Zone s defined strike length is 525 meters with a width of 20-to-75 meters and 2-to-25 meters thick. The previously identified 12 domains of mineralization have been re-interpreted into a total of 13 domains (A 10, A 20, A 30, A 40, B 50, B 60, B 70, C 80, Z 90, Z100, Z 110, TG 120 and TG 130). The series of domains trace a form (said to be in the shape of a flattened cigar ). The deposit area remains open up and down dip, especially the southern projection where drilling has been limited and inconclusive xxviii
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The model for the Grenoble deposit has transformed over the last 20 years, reflecting the complexities and irregularities discovered by the multiple drilling programs. Several other insights are worth mentioning:
1) Higher grade pockets of mineralization appear to be related folds or faults in the top surface of the Lower Serpentinite unit.
2) It is not unusual for intrusive dykes to disrupt the continuity of the deposit. 3) Quartz-pyrite veins with base metal sulfides along with gold and silver are a third style of mineralization on the Lexington Property. Early exploration and production targeted this type of deposit, namely at the City of Paris, Lincoln and No. 7 mines. However, these targets were and are small.