Siuna Camp
Calibre's Siuna camp has the potential to host gold skarn mineralization and associated porphyry mineralization. The camp covers 9,500 hectares of concessions including the past producing La Luz-Siuna mine that produced gold from skarn mineralization. The small town of Siuna is located within the concessions. Historic La Luz-Siuna gold mine The La Luz-Siuna gold mine was in production in the Siuna camp in the mid-1960s to early 1980s and had a low grade resource remaining at the time it was shut down.
2,273,000 ounces gold 672,210 ounces silver 17,092,000 tonnes La Luz-Siuna historical resource*: 816,958 ounces gold 10,683,300 tonnes Calibre has two advanced stage drill projects in the Siuna camp located adjacent to the historic La Luz-Siuna mine that have the potential for additional economic mineralization:
The Cerro Potosi gold project is located immediately east of the historic La Luz-Siuna open pit and west of the north trending Potosi fault. It covers the mine series sedimentary volcanic package in the footwall of the previously mined No. 1 orebody of the La Luz-Siuna mine. Wide spread mineralization in parallel northwest trending gold bearing zones was identified through diamond drill programs completed by previous operators in 2008 and 1997. These zones are inferred to each have a strike length of 275 metres to 300 metres with mineralization identified to vertical depths of 120 metres. Results from the 2008 drill program include:
Cerro Aeropuerto project The Cerro Aeropuerto gold project is located approximately 1.1 kilometres south of the Cerro Potosi project, along the inferred southern extension of the Potosi fault. The local geology is similar to that of the La Luz-Siuna and Cerro Potosi with mineralization hosted within altered mine series sedimentary rocks and porphyry intrusions. Diamond drill programs completed by previous operators in 2008 and 2007 identified a zone of gold mineralization that can be traced over 300 metres in strike and more than 300 metres downdip. Results from that drill program include:
Geology of Siuna camp The Siuna camp consists of a 12 kilometre long by 1-2 kilometre wide, north-northeast oriented arcuate belt of Todos Santos Formation limestone and calcareous sediments in contact and interbedded with pre-Matagalpa andesitic volcanics. Subvolcanic intermediate to mafic dikes and sills intrude this sequence and are related to the gold-copper skarn deposits at Siuna. The extensive exposures of Todos Santos Formation sediments suggests fairly deep levels of erosion in this camp making it more prospective for skarn and porphyry-style mineralization, rather than epithermal mineralization. * Historical production and resource from (Arengi 2002). Total historic resource is not NI43-101 compliant. These resources are estimates and have not been verified by the company; they are presented only for historical completeness .  | |