TIN

ISBN: 9780282917326 Géneros: TB Sinópsis: Excerpt from Tin Describing the Chief Methods of Mining Dressing and Smelting It Abroad With Notes Upon Arsenic Bismuth and WolframNear the former place which has given its name to the entire district the mineral cassiterite occurs in deposits of two distinct sorts in the one case impregnated through a mass of rock locally known as zwitter that measures about 1312 feet across its outcrop in the other associated with hematite quartz and other gangue in a number of small but regular fissures averaging rarely more than 8 inches in width These latter form a complete network of veins through the same formation of zwitter alluded to which is enriched wherever they traverse it although the veins themselves now hold but a comparatively small amount of tin On passing into the adjoining porphyritic granite most of them however appear to become richer and are frequently found with a parting of red clay whilst on the other hand they cease to be productive where they enter the next adjacent eruptive masses of quartzporphyry and syeniteporphyry which so imperceptibly merge into one another that no distinct line of demarcation can be traced between themAbout the PublisherForgotten Books publishes hundreds of thousands of rare and classic books Find more at wwwforgottenbookscomThis book is a reproduction of an important historical work Forgotten Books uses stateoftheart technology to digitally reconstruct the work preserving the original format whilst repairing imperfections present in the aged copy In rare cases an imperfection in the original such as a blemish or missing page may be replicated in our edition We do however repair the vast majority of imperfections successfully any imperfections that remain are intentionally left to preserve the state of such historical works