South Dakota
Hard rock lithium in the USA
The Black Hills of South Dakota are famous for historic lithium mining dating back to 1898 when Li-bearing spodumene (contains up to 7% Li₂O), and amblygonite (contains up to 10% Li₂O) was first mined near the township of Custer.
IRIS controls the largest number of lithium claims in the Black Hills, South Dakota. In addition to this, IRIS also owns various patented project locations, including the Beecher and Edison projects. IRIS’ portfolio is comprised of the following sub projects:
- Beecher Project;
- Dewy Project;
- Custer Project;
- Helen Beryl Project; and
- Ruby Project
- Keystone & Edison Project; and
- Tinton Project
which contain abundant outcropping LCT pegmatite swarms. These projects represent large areas of fertile lithium-cesium-tantalum (“LCT”)-pegmatites covering several historic lithium mines and numerous historical industrial mineral pegmatite mines.
