The Montes de Oro prospect, located four kilometres to the northeast of La Virgen, was defined through prospecting and stream sediment sampling. A subsequent soil survey highlighted a strong coincident Au-As-Cu-Pb-Zn anomaly over a 400 m x 650 m area. Detailed mapping and excavation of trenches and pits has helped define an irregularly shaped diorite body which cuts northwest through the prospect area and intrudes porphyritic andesite and apparent rafts of siltstone and limestone from the Todos Santos Formation. A strong, steeply dipping northeast oriented fault system bounds the prospect to the south and appears to have concentrated fluids through the prospect area resulting in extensive propylitic and skarn style alteration, development of a 200 m x 500 m northeast oriented gossan zone, and areas of massive sulphides further towards the northwest. Work at the prospect is highlighted by trench MTR13-009 which intersected 9.00 m grading 10.76 g/t Au, 0.12% Cu and greater than 1% Zn (assays pending) and by Pit 11 where a 2.00 m channel sample returned 27.18 g/t Au.
Primavera Gold-Copper Porphyry Project Update
B2Gold as operator of the Joint Venture continues to advance the Primavera gold-copper porphyry discovery. The current work program is designed to identify the faulted off extensions to the high grade gold-copper mineralization intersected in the central portion of the Primavera Zone. B2Gold has completed a series of pits to the north and northwest of the existing drilling and assays results are pending.
Santa Rita Option (Alder Resources) Update
Alder Resources continue to be active on the Santa Rita Project which includes the past producing Santa Rita copper-gold-silver open pit mine and a compliant inferred resource of 7.95 million tonnes grading 0.62% Cu, 0.46 g/t Au and 9.2 g/t Ag for the mine stockpiles (see news release dated May 9, 2012). Upcoming exploration will also be directed at further definition of the recently discovered high grade copper-gold-silver supergene enriched blanket at Tipispan that includes 7.48% Cu, 2.36 g/t Au and 316.13 g/t Ag over 6.5 metres and 5.21% Cu, 4.4 g/t Au and 144.01 g/t Ag over 12.1 metres in trenches.
Updated maps detailing the result of the current exploration programs will be posted on the Company's web site at www.calibremining.com. Mr. Gregory Smith, P.Geo, the President and CEO of the Company, is the Qualified Person as defined by NI 43-101, and is responsible for the accuracy of the technical data and information contained in this news release.
About Calibre Mining Corp.
Calibre Mining Corp. is a TSX Venture Exchange listed company (TSX VENTURE: CXB) that is focused on the acquisition, exploration and development of gold and silver deposits in Central America. The Company is focused on its 100% owned Riscos de Oro gold-silver deposit, the drilling program at the Primavera gold-copper project in conjunction with B2Gold Corp. and the drilling program on the Rosita copper-gold-silver project in conjunction with Alder Resources Ltd. Major shareholders of Calibre include gold producer B2Gold and investment fund Sun Valley Gold.
Calibre Mining Corp.
Greg Smith, P.Geo., President and CEO
Neither the TSX Venture Exchange nor its Regulation Services Provider (as that term is defined in the policies of the TSX Venture Exchange) accepts responsibility for the adequacy or accuracy of this release.
Calibre Mining Corp. - Vancouver, Canada
604 681 9944
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