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Extraction Of Silver By The Wet Way, Justo Garcia Martinez

Bachelors Theses

"The great variety of ores in which silver occurs, usually makes it necessary to employ complicated processes for its extraction.

The extraction of the precious metal admits of two general processes viz. The Dry, and Wet Way and as I have chosen the latter for the subject of my thesis, we will be dispensed with the Dry Way, and will try and give all the processes and forms in which silver is extracted by the Wet Way"--page 1.

The Cost Of A Structure Which Is To Take The Place Of The Beaver Bridge, Rudolph C. Hoyer

Professional Degree Theses

"The subject of this treatise is the cost of a structure, which is to take the place of the Beaver Bridge.

This bridge is located on the St. L and San F. Rwy., four miles southwest of Rolla and it spans a deep valley nearly a 1000 ft. in width in the bottom of which runs a small stream The course of roadway over the bridge is N. 24 1/2 E.

The old wooden Howe Truss bridge, being no longer considered perfectly safe, on account of its age, measure was taken to supply its place with some new structure that, …

The Production Of Spelter From Zinc Blende, Lee R. Grabill

Bachelors Theses

"The problem which has been assigned to me for discussion as examination in metallurgy, is the treatment of a zinc blende from Sevier County, Arkansas; using the common Missouri or Illinois coal for fuel and the Spadra coal of Johnson County, Arkansas, as a reducing agent in the distillation process; and as clay for the manufacture of retorts, etc. that from the works at Cheltenham, Missouri, furnished by Parker, Russell & Company. Analysis of the materials used are to be given with details of processes and drawings & descriptions of machinery used; also approximate cost of furnaces, and approximate cost …

Treatment Of Gold And Silver Ores As Found In The Comstock Lode, Lee R. Grabill

Professional Degree Theses

"Statement of Problem: Metallurgy of Gold, etc.

Required, description of process and machinery used in the extraction of Gold and Silver from earthy and siliceous ores as found in California, the ores being represented by the following- SiO₂, 91.44; (Zn,Pb)+Cu₂S, 1.38; Al₂O₃, Fe₂O₃, etc. 6.39; Au, .0017, Ag₂S .12, Variable in 1st, 2nd, and 3rd class ores.

1° - The methods, etc. employed in treating 1st class ores, -such as exceed in value $150 per ton.

2° - Methods, etc. in treating 2nd class ores, such …