Calibre Mining And Rio Tinto Exploration Initiate 2021 Exploration Program

VANCOUVER - Calibre Mining Corp. reported on the Borosi exploration project held under an earn-in option agreement between Rio Tinto Exploration and Calibre. Calibre controls a 100% interest in the Borosi concessions located in the prolific Mining Triangle region of northeastern Nicaragua. RTX has the right to earn a 75% interest by spending US$45 million over eleven years in the project. The Borosi exploration program is being directed by RTX through a partnership agreement with Calibre as project operator.

Darren Hall, President and Chief Executive Officer, said, “We are excited to launch the 2021 exploration program with our partner Rio Tinto. Partnering with Rio Tinto, a global mining industry leader, provides a significant opportunity to leverage the discovery potential of our large portfolio of base metals properties while we continue to focus on growing gold resources within our 100% owned exploration and operating properties in support of our ‘Hub-and-Spoke’ operating model.”

Since entering the Borosi option agreement in February 2020, the RTX team has conducted extensive evaluation of exploration data stemming from Calibre’s work over the past 10 years as well as Rio’s own information sources and data archives that go back several decades. More than 50 prospective target areas have been identified within the Borosi concessions. Four of these areas have been prioritized for a first pass drilling campaign totaling 5,500 meters commencing in early Q2 2021. Additionally, an orientation survey has been initiated to characterize the broader geochemical expression surrounding the Primavera copper-gold porphyry deposit discovered by Calibre in 2011. The results of this work will provide an important benchmark to guide future regional reconnaissance work to be carried out under the RTX-Calibre Exploration Alliance agreement the companies also entered in early 2020.