📕 Excerpt from Annales des Mines, Vol. 7: Ou Recueil de Mémoires sur l'Exploitation des Mines, Et sur les Sciences Qui S'y RapportentLes procédés de préparation mécanique se Préparation bornaient, sur les mines que nous avons visitées, mécanique. À de simples criblages et débourbages.About the PublisherForgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.comThis book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art 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.