Ore sorting on the Ferreira mine
By: paper read by Mr. J. Harry Johns... at the Ordinary Monthly Meeting of the Association[of Mine Managers]... on Monday, December 20th 1897.
Contributors: Johns, J. Harry.
Publisher: Argus Printing and Publishing Company
Published: 1898
Place of publication: Johannesbury
Language: eng
Subjects: Goldmining -- Economics.; Mining, Gold -- South Africa.
Notes: J. Harry Johns, son of Captain James Johns senior agent of Dolcoath, wasmanager of Ferreira Mine.