The approval comes after an Environmental Impact Assessment and Plan of Operations reviewed by the local authorities.
Global Minerals CEO Bill Pincus said, "The permits will allow us to complete test mine studies for a full feasibility study and can eventually be amended to allow the start-up of operations once the company has received a tailings disposal permit."
With this development, the company will be able to mine and concentrate up to 85,000 tons of ore per year from underground operations.
The company also said that underground drifting on Level 6 has intercepted a 6.1m intersection of tetrahedrite, the sulphide mineralization that contains most of the silver, copper and antimony.
Located near the town of Roznava in eastern Slovakia, Strieborná is a high-grade silver/copper/antimony vein deposit with a working shaft and hoisting system, underground access through a series of drifts, crosscuts and tunnels and associated surface facilities.