Approximate Quantitative Microscopy of Pulverized Ores, Including the Use of the Camera Lucida Page: 3
iii, 3-20 p. : ill. ; 23 cm.View a full description of this report.
Extracted Text
The following text was automatically extracted from the image on this page using optical character recognition software:
APPROXIMATE QUANTITATIVE MICROSCOPY OF PULVERIZED
ORES, INCLUDING THE USE OF THE CAMERA LUCIDA.
By WiLt H. COGHILL and J. P. BONARDI.
INTRODUCTION.
In its investigations of ore dressing the Bureau of Mines has given
attention to the use of the microscope in the study of ores as an aid
in determining their physical nature and their amenability to the
methods of concentration. This paper, which deals with the study
of pulverized ores and the use of the camera lucida in such work,
discusses an investigation undertaken at the Seattle and the Golden
mining experiment stations of the Bureau of Mines.
Devices for the concentrating of ores are now so well developed
and the methods of use are so generally known that even the novice
may expect fair results when he undertakes ore testing. If the ore
is amenable to gravity concentration the novice can crush and classify
it and pass it over jigs and tables with the assurance of fair recov-
eries. If the ore is amenable to flotation he can probably " dope " the
charge with an oil that will produce a good mineral-bearing froth;
but if good manipulation falls a little short of the mark in recovery
or grade of product, the novice will not be able to make the requisite
diagnosis for obtaining better results. At this point the work of
the metallurgist begins. Consequently the metallurgist must be a
diagnostician.
In one instance an unknown physical property may interfere, and
in another an unknown chemical property; each property may have
its complexes. Hence a large number of methods for gathering in-
formation is necessary in order to find one method that will serve as
a basis for the solution of the problem. This paper discusses a micro-
scopic method; it is limited in its application to those ores in which
the unpolished mineral grains may be identified at sight.
ACKNOWLEDGMENTS.
The writers deeply appreciate the cooperation of the College of
Mines, University of Washington; the assistance of R. B. Moore and
S. C. Lind of the Golden mining experiment station; and particularly
3
Upcoming Pages
Here’s what’s next.
Search Inside
This report can be searched. Note: Results may vary based on the legibility of text within the document.
Tools / Downloads
Get a copy of this page or view the extracted text.
Citing and Sharing
Basic information for referencing this web page. We also provide extended guidance on usage rights, references, copying or embedding.
Reference the current page of this Report.
Coghill, Will H. & Bonardi, J. P. Approximate Quantitative Microscopy of Pulverized Ores, Including the Use of the Camera Lucida, report, October 1919; [Washington D.C.]. (https://digital.library.unt.edu/ark:/67531/metadc66425/m1/5/: accessed April 25, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.