The pegmatite has been developed by a shallow mine, accessed by a 20-degree decline.
Tantalum occurs in a variety of mineralized zones.
Cesium occurs with the spodumene, lepidolite, and feldspars. Two lepidolite zones contain lithium, tantalum, rubidium and gallium. Over 60 trace and rare minerals have so far been identified in this pegmatite. Explored for tim in the late 1920's, interest in the pegmatite was renewed between 1954 to 1957, this time for lithium. From 1962 to 1967 cesium ore was mined.