La Parrilla

La Parrilla is an underground mine complex owned by Silver Storm consisting of multiple inter-connected mines within a ~38,128 ha land package. The property has known mineralization throughout, with a complex of five past-producing underground mines surrounding the mill, including Los Rosarios, La Rosa, San Jose, Quebradillas and San Marcos.

The mine was placed on care and maintenance in 2019. La Parrilla has a 2,000 tpd processing plant and associated infrastructure. Following the acquisition of the mine from First Majestic, Silver Storm initiated an infill drilling program, resulting in a 107% increase in Indicated Mineral Resources and a 58% increase in Inferred Mineral Resources. Recent updates have focused on restart activities, including a 6,000 metre underground drilling campaign launched in January 2026, expansion of the sulphide flotation circuit to 1,250 tpd, processing plant rehabilitation, construction of a new on-site laboratory expected to be commissioned by the end of Q2 2026, and mobilization of underground mine development contractors. Silver Storm expects to restart operations in Q2 2026.

Recent highlights from drilling at La Parrilla include 1,810 g/t AgEq over 14.6 metres and 689 g/t AgEq over 9.4 metres. More recent drilling at the San Nicolas Zone returned 473 g/t AgEq over 3.6 metres and 137 g/t AgEq over 12.0 metres, extending mineralization at depth.

Metalla holds a 2.0% NSR royalty on La Parrilla.