Tertiary Minerals plc, together with its subsidiaries, engages in the identification, acquisition, exploration, and development of mineral deposits. The company engages in the development of a multi-commodity project portfolio, including precious metals, base metals, and industrial minerals. It owns interests in the Storuman fluorspar project located in north central Sweden; the Lassedalen fluorspar project located in the south-west of Oslo, Norway; the Pyramid gold project located in the northwest of Reno, Nevada; the Paymaster polymetallic project that includes claims covering an area of 390 acres located in southwest of Tonopah, Nevada; and the Kaaresselkä and Kiekerömaa gold projects located in Finland. The company also holds interests in the Rosendal tantalum project located in south-west Finland; the Lucky copper prospect consisting of 13 claims located in north-east Nevada; and the Mt Tobin prospect comprising claims located to the south of Winnemucca in north central Nevada. Tertiary Minerals plc was incorporated in 1999 and is headquartered in Macclesfield, the United Kingdom.