Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) KUBOTA Tomonobu and OTSUKA Takuzi and NAKAMURA Iemasa,The Flotation of “KUROMONO (Black Ore)” from Kosaka Mine,Journal of the Mining and Metallurgical Institute of Japan,03694194,The Mining and Materials Processing Institute of Japan,1961,77,879,729-734,https://cir.nii.ac.jp/crid/1390282680957925632,https://doi.org/10.2473/shigentosozai1953.77.879_729