Formation of rare metal resourses from the Tamagawa hot spring, Akita Prefecture

Abstract

Several rare metals, such as In and Ga, were deposited along the Tamagawa-river originated from the Tamagawa hot spring. As (Arsenic) was adsorbed onto hydrous ferric oxides and precipitated under the condition of low pH (<3.5). However, Ga and In were precipitated under relatively high pH (>3.5) condition. In was more efficiently precipitated than As at Lake Hosen (downstream of Tamagawa-river).