Driving Mine Headings in Rock Tunnels
This paper deals specifically with heading-driving as distinguished from the broader term tunnel-driving. A heading is a pilot or path-finder for the main tunnel. Some headings are complete tunnels in themselves; that is, conditions at times warrant driving a heading the full diameter of the proposed tunnel. A tunnel 10 ft. in diameter might be […]
Chemistry of Natural Borates
Since the borates which supply commerce with most of the raw materials for conversion into borax as it is used in the arts now come from old lake-beds or inland-sea deposits, their chemical relations and development are quite like those of saline deposits generally. While a general sequence of salts in the precipitations from complex […]
Grinding Mill Design & Ball Mill Manufacturer
All Grinding Mill & Ball Mill Manufacturers understand the object of the grinding process is a mechanical reduction in size of crushable material. Grinding can be undertaken in many ways. The most common way for high capacity industrial purposes is to use a tumbling charge of grinding media in a rotating cylinder or drum. The […]
Borax Ore Deposits & Geology
A complete transformation has taken place in the borax industry. A most remarkable factor in this radical change in method of producing the crude borates has been its removal from the realm of industrial chemistry to the field of mining. With the development of extensive deposits of borate-minerals interstratified in thick sequences of Tertiary clays and […]
Ruble Hydraulic Elevator Ribble Laddler
In many of the old placer-mining districts are still to be found large tracts of gold-bearing gravel not suitable to be worked with a dredge, because the bed is too shallow or the gulch too narrow. Frequently there is not enough grade to handle the gravel successfully by ground-sluicing or a bed-rock flume, or it […]
Mineral Assay & Testing Laboratory Services
After the completion, of the Hammond Mineral Assay & Testing Laboratory of the Sheffield Scientific School, Yale University, it became necessary to secure and assay a large assortment of ore-samples, and to arrange the results in such a manner as to admit of use with the least amount of work on the part of the […]
Cone Crusher Parts
Cone Crusher SPIDER CAP The cast steel spider cap has been designed to serve as a feed distribution plate for coarse materials. It is recessed on the 22, 30, 36 and 48-in. crushers. For fine materials, the wobble plate feeder — a more effective means of distributing the feed — is recommended. TOP SHELL AND […]
Amalgamation Pan
The aim of instruction in a metallurgical laboratory is to make real the principles on which metallurgical processes and operations are based, and to foster the spirit of investigation. The materials with which experiments are carried out are ores, metals, and metallic compounds. The method varies with the end sought. A class may work as […]
Jigging Minerals: Galena – Sphalerite
Summarizing some of the principal points brought out in this laboratory Jigging of Minerals’ investigation, I believe the following may safely be accepted: The pulsion-reaction is by far the most important one in the process of jigging. During this period, with sized grains of different specific gravities, with proper pulsion-velocity, the separation between them will […]
CuSO4 Electrowinning with Crystallization of Bleed
Commercial copper SX reagents do not exhibit perfect selectivity. From typical acidic feed solutions, the most significant co-extracted impurity is ferric iron. The copper/iron extraction ratio for a given reagent operating in a countercurrent circuit will vary significantly with reagent content of the solvent, composition of the feed solution, organic/aqueous flow ratio, temperature, mixer retention […]