Calibre Mining is a gold and copper exploration company with projects in Nicaragua. They have multiple partnerships and joint ventures on their projects that allow other companies like B2Gold, IAMGold, Centerra Gold, and Rosita Mining to earn interests in the projects by funding exploration. Calibre's projects include the Primavera gold-copper project, Eastern Borosi gold-silver project, and Santa Maria gold project, among others. Assay results have shown high grades of gold, silver, and copper at several of the projects.