A YELLOWISH-GREY tuff, about 1 m thick, is distributed over a considerable area of the Sorachi coal field, Hokkaido, Japan 1, as a member of the Noborikawa coal-bearing formation. The tuff ...
Aneka Tambang, known as Antam, is a state-owned diversified mining company. It is Indonesia's largest producer of nickel, which is used for car components and kitchen utensils. The company also ...