Calibre Mining Corp. (TSX VENTURE:CXB) has announced new gold and silver resources for the 100% owned Cerro Aeropuerto and La Luna deposits.
Wardrop, a Tetra Tech company ("Wardrop"), has completed a review of both deposits and calculated National Instrument 43-101 ("NI 43-101") compliant, inferred resources totalling 835,450 ounces of gold and 4,288,070 ounces of silver (903,000 ounces of gold equivalent).
Robert Brown, President and Chief Executive Officer of Calibre Mining stated: "The Borosi Project area and the Mining Triangle district in Nicaragua has recorded historic production of over 5.0 million ounces of gold and 4.0 million ounces of silver. These initial gold and silver resources from La Luna and Cerro Aeropuerto support our view that Calibre's 867 km2 Borosi concessions remain underexplored and host high potential for new precious metal discoveries and continued resource expansion."
Cerro Aeropuerto
The 100% owned Cerro Aeropuerto deposit is 500 metres directly south and on strike of the past producing La Luz (Cerro Potosi) Mine in Siuna, Nicaragua. The La Luz Mine, also owned 100% by Calibre, is a gold skarn system that based on production records and historical (non NI 43-101 compliant) resource, contained 3.09 million ounces of gold. Using a 0.6 g/t AuEq cutoff, the Cerro Aeropuerto deposit is estimated to host 707,750 ounces of gold and 3,144,500 ounces of silver (757,000 ounces of gold equivalent) within 6.052 million tonnes grading 3.64 g/t Au and 16.16 g/t Ag.
The Cerro Aeropuerto resource was calculated using data from 2,937 metres of HQ drill core from 9 holes over a 500 metre strike length. Further exploration on the Cerro Aeropuerto deposit will focus along strike towards the past producing La Luz Mine as well as along parallel mineralized structures identified during the 2008 drill program, but not incorporated into this resource calculation. The Cerro Aeropuerto gold-silver deposit remains open for resource expansion along strike and to depth.
The La Luna resource was calculated using data from 2,159 metres of HQ drill core from 11 holes and 280 metres of surface trenching over a 1½ kilometre strike length. The deposit is separated into northern and southern zones that are separated by 350 metres of offset. Further exploration of the La Luna deposit will focus along the southern strike extent of the deposit, as well as on trenching and diamond drill testing of an inferred dilation zone between the north and south zones. The La Luna gold-silver deposit remains open for resource expansion along strike and to depth.
Resource Details
The resource was completed by Wardrop. An NI 43-101 technical report will be filed on SEDAR within 45 days. Several factors were considered in the definition of a resource classification including: National Instrument 43-101 requirements, Canadian Institute of Mining, Metallurgy and Petroleum guidelines, and the report author's experience with Tertiary skarn and epithermal deposits.
Individual block models were established in Datamine for both deposits. Drill hole spacing varies, with the majority of the drilling at 100 metres at Cerro Aeropuerto, and between 25 metres and 200 metres at La Luna. Block size of 4x10x10 metres was selected in order to accommodate the nature of the mineralization. Sub-celling of the block models was used to allow the parent blocks to be split once in each direction to more accurately fill the volume of the wireframes, thus more accurately estimate the tonnes in the resource. Grade capping was applied where appropriate using the Parrish analysis.
The interpolations of the deposits were completed using the Inverse Distance Squared (ID2) estimation method with a three pass spherical search ellipse. The global block model statistics for the ID2 model were compared to the Nearest Neighbour (NM) model. In general there is agreement between the two models and discrepancies were reflected as a result of lower drill density in some portions of the model.
Qualified Person
Todd McCracken, P.Geo, is a Qualified Person ("QP") for purposes of NI 43-101. He is responsible for preparing the Report and the Resource Estimate disclosed in this press release and the Report. Mr. McCracken is an employee of Wardrop, and independent from the Companies as described in section 1.4 of NI 43-101. He has read and approved the technical disclosure in this press release.
Source: Calibre Mining Corp.