"This paper was written with two objects in view: (1) To describe in detail what has been done toward the ventilation of the main unit of the Portovelo mines and the results; (2) to give information that may be useful to anyone who may have to make a preliminary mine ventilation survey, with recommendations for the improvement of the existing system and finally the maintenance of the improved system"--page 1.
Professional Degree in Mining Engineering
South American Development Company
Missouri School of Mines and Metallurgy
© 1932 John P. Harmon, All rights reserved.
Thesis - Open Access
Gold mines and mining -- Ecuador -- Portovelo
Mine ventilation -- Safety measures
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Link to Catalog Recordhttp://merlin.lib.umsystem.edu/record=b1068933~S5
Harmon, John Paul, "Ventilation at the Portovelo mines" (1932). Professional Degree Theses. 241.