Three periods of activity make up the mining History of the Silver City region. As the graph in Figure 7 shows, two of these episodes were ... p. 125). The mine is also opened by two higher adits that were used in the early History of the operation (Fig. 37). The adit and crosscut levels are connected by ... is evident from the old shafts and adits in the vicinity. Nothing is known of tneir History. The veins have a considerable strike length and are worth further ...

were controlled by the cooling History of the flows which governed the rate, degree, and mechanism of ...

History and production ...

, A History of the Western Phosphate Industry, Proceedings of the 1966 Industrial ...