At present numerous outcrops and several working mines are known in this area. The relation of the representative ore-deposits and their stratigraphical situation is as follows;
Formation Name of ore-deposits Nakashichiban anticline
Yakushi anticline
Northern wing Southern wing Northern wing
Tomisato — — —
upper upper — — Shirataki (81) ↑Minawa middle Minawa (1) Sazare (22)(23) Besshi(43) Ikadatsu (35)
Yokei(40) Shimokawawa (79)
lower — Yakushi (20) Kamizeki (69)
Motoyasu (52) ↓ Koboke — — —
lower Kawaguchi Shingu (11) — —
Ooboke — — —
Number in ( ) shows location on the distribution map of ore-deposits in central Shikoku. Name, dimension and production of the working ore-deoosits are as follows:
Name of ore-deposits Strike Elongation Width@ Outline of production Copper Besshi Mine
Bessi (43) 1, 600m 2, 000m+ 3.00m 550, 000t/y 1.2%
Yokei (40) 50m 1, 500m+ 0.50m 15, 000t/y 1.8%
Ikadatsu (35) 300m 2, 000m+ 0.80m 70, 000t/y 1.6%
Motoyasu (52) 200m 1, 400m 0.50m 20, 000t/y 1.4%
Shirataki Mine
Shirataki (81) 600m 4, 200m+ 0.50m 100, 000t/y 1.4%
Shimokawa (79) 1, 000m 2, 000m+ 0.50m 14, 000t/y 1.1%
Sazare Mine
Kinsha (23) 350m 1, 500m+ 3.00m
Kinsen (23) 300m 1, 000m+ 0.50m 250, 000t/y 1.8%
Kinritsu (22) 250m 1, 500m+ 0.50m
Shingu Mine
Shingu (11) 70m 1, 200m+ 0.80m 15, 000t/y 1.6%