Further occurrence of brown ores in Kuroko-type deposits in Japan

Akira Imai, Osamu Ishizuka, Ryoichi Yamada, Hiroshi Miyamoto

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


The occurrence of so-called brown ore from the Kuroko-type deposits in Japan was examined. Brown ore specimens from the Kannondo, Inarizawa, Matsumine, Fukazawa, Uchinotai, Kosaka (orebody unknown) and Nurukawa deposits have been found in the ore collection stored by Dowa Mining Co. Ltd. and the subsidiary companies. In addition, occurrences from the Fukazawa, Matsumine, Ezuri, Shakanai, and Ginzan deposits were previously reported. The brown ore is characterized by its color and by its higher Ag concentration (up to around 2,400 g/t) than ordinary black ores. This type of ore occurs commonly in the Kuroko-type deposits in Japan, whereas its extent is limited. The brown ore is a type of Au-rich massive sulfide ore formed in submarine hydrothermal system.

Original languageEnglish
Pages (from-to)263-268
Number of pages6
JournalResource Geology
Issue number3
Publication statusPublished - Sept 1 2001
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Geology
  • Geochemistry and Petrology


Dive into the research topics of 'Further occurrence of brown ores in Kuroko-type deposits in Japan'. Together they form a unique fingerprint.

Cite this