The Bureau of the Mint of the United States Treasury maintains offices for the purchase of gold-bullion, and this paper describes an investigation to establish
Frequently in using a thermo-electric pyrometer for measuring the temperature of a furnace, a hole is drilled at the back or side of the furnace,
Table of ContentsStudies in Refining Electrolytic CopperRefining-Charge No. 1Refining-Charge No. 2Summary of Refining-Charges Nos. 1 and 2Studies in Overpoling Electrolytic Copper The object of refining
Table of ContentsExperimental WorkRecord of ResultsConclusion Lime Roasting is a term proposed by Ingalls for the operation of forcing air under pressure through a mixture
In the crucible-method of assaying ores for silver a certain amount of litharge is essential to supply sufficient lead to collect the precious metals. The
Table of ContentsRoastingChlorinationLeachingTreatment of TailingsDiscussion of Test & MethodTests for Quantity of Bleach and of Sulphuric AcidTreatment of the Gold Chloride SolutionBarrel Test Experience has shown how difficult
The methods employed in dressing the tin ore up to the required percentage of purity depend mainly on the type of ore crushed. These may
The purpose of this paper is to discuss the relative merits of the large 3 1/8-in. machine and the small mining drill 2¼-in. tappet machine
Table of ContentsThe Silver Skims Form Another CycleGold PressingsGold PartingTreatment of Antimony DrossTreatment of Silver Retort DrossHoward PressHoward Stirrer Here is a short account of the
The ore consisted of quartz, in which, above the 250-ft. level, the iron-minerals were largely oxidized and some free gold was visible; below that level
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