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Orivesi Gold Mine
Resources and Reserves
The Proved and Probable Ore Reserve at the Orivesi Gold Mine are 347,000 tonnes @ 5.8 g/t gold (65,000 ounces) as at 31 December 2013.
The Measured, Indicated and Inferred Mineral Resources at 31 December 2013 for the Kutema lode system below the 720m level is 438,000 tonnes @ 6.2 g/t gold (87,900 ounces) and the Sarvisuo lode system, 149,000 tonnes @ 7.2 g/t gold (34,200 ounces). These Mineral Resources are reported at a 3 g/t gold cut-off grade.
For further details on the Ore Reserves and Mineral Resources for the Orivesi Gold Mine refer to the Reserves and Resources page.
The Orivesi Gold Mine is located within the Proterozoic Tampere Schist Belt, which is dominated by turbiditic metasedimentary rocks, metavolcanic rocks of island-arc type and syn-orogenic granitoids.
The known gold lode systems occur in a broader zone of hydrothermally altered rocks that extend over an area of approximately 0.5 km2, at the contact of metavolcanic rocks and a sub-volcanic intrusion.
The gold mineralisation is found in vertical pipe-like lode systems which occur in strongly deformed, andalusite rich, silicified zones. The depth continuation of these lode systems ranges from tens of metres to hundreds of metres.
The deposit type is suggested to be a metamorphosed palaeo-epithermal gold deposit.
Underground diamond core drilling at the Orivesi Gold Mine continued to return a series of encouraging intercepts, which have further improved confidence in the geological model with results demonstrating the depth continuation of the Kutema lode system at widths and grades commensurate with the existing model. Results from the drilling that initially targeted the panel between the 880m and 960m level and the as yet to be completed program that is targeting the panel between the 960m and 1200m level has yielded a number of highly encouraging intercepts including the recent 10.25metres @ 14.29 g/t gold and 12.00 metres @ 7.97 g/t gold from Pipe 5 at approximately the 1070m and 1110m levels, respectively.
The hydrothermally altered domain surrounding the known ore bodies is prospective for the discovery of new gold bearing pipes or pipe clusters. Exploration activities conducted from 2006 to 2013 has returned a number of promising gold intercepts from limited drilling, on the northern side of the Kutema and Sarvisuo lode systems.
It is the objective of the exploration programs to identify, and then define the extent and geometry of new gold-bearing zones in the hydrothermally altered domain in readiness for future mining studies.
Exploration at the Orivesi Gold Mine