[D0014AAP], Letter from Thomas Alva Edison to Cloyd Mason Chapman, John Vincent Miller, August 21st, 1900


View document with UniversalViewer   → View document on Archive.org  → Re-use this digital object via a IIIF manifest


[D0014AAP], Letter from Thomas Alva Edison to Cloyd Mason Chapman, John Vincent Miller, August 21st, 1900




Folder/Volume ID


Microfilm ID


Document ID



Thomas A. Edison Papers, School of Arts and Sciences, Rutgers University


Letterhead of the Laboratory of Thomas A. Edison.
Orange, N. J.
Aug. 21, 1900.
Messrs. Miller & Chapman,
Dolores, New Mexico.
Dear Sirs:-
Report of August 16th received.
1st. If we get 90% saving of original gravel, it will answer, providing we simplify and cheapen the milling process.
2nd. Mr. Hoyt has written me that the annual meeting of the Company will soon take place, and that he wants me to make a report to submit to the stockholders.
3rd. I think you should now go ahead with the best arrangement you have, and run the gravel from the pits through as first contemplated. Any further experiments necessary can be made after you are through with all the test pits.
4th. I do not find in your table of results, the column showing the weight of the original material from the mine from which you screened the stuff passing through the mill.
5th. You have one column marked, "Value of this size gravel per ton" as this dont average over 30 cents per ton, and is only the finer part taken from a large quantity, the original gravel must have been very poor stuff; or do you mean by this column that its the original gravel boulders and all.
<O. M. _ Ortiz Mine> 6th. In none of your reports have I been able to even guess at the value per ton of the gravel as a whole.
7th. Please send results of each hole as you finish it, and arrange your columns not in percentage, but in pounds; for instance
Weight of whole of material of pit.
Weight of material screened out going to mill.
Weight of each size.
Weight of Concentrate each size.
Weight of Concentrate after iron removed.
Value per ton of final Concentrate.
Value of the Original material of the hole in ton at on Cubic Yard.
T A Edison
Download CSV | JSON