Where and how are igneous rocks mined??

Where? some mines are located in Canada, but I would assume anywhere a volcano may be present, how? there are several methods for this type or material; Selective mining methods and Bulk mining methods, which have categories of their own

Selective mining methods: Cut and fill,Drift and fill, Shrinkage stoping , Room and pillar mining, and Vertical retreat mining (VRM) also known as Vertical crater retreat (VCR)

Bulk mining methods: Block caving