The Mules and their Drivers.— On Tuesday afternoon a singular sight presented itself near Thebarton Bridge — between 200 and 300 mules in a mob at the waterside and in the bed of the river. They belong to the English and Australian Copper Company, being usually employed in the carriage of copper and coals between the Burra Smelting Works and Port Wakefield, and have been brought in for the purpose, of taking northward a number of waggons just arrived from England, which will be loaded with coal for the smelting furnaces. They had travelled that morning from Willaston (26 miles), and were to be depastured for the night in some sections near Thebarton engaged for the purpose. Each carried his light harness wound about his body. More striking and more strange than the mules themselves were their Chilian drivers—fine dark fellows, some of them wearing rather picturesque costume, and mostly armed with the tremendous spur used in South America, with rowels as large as the palms of their hands. Several of them paid a visit to Adelaide towards evening, and attracted some attention from the peculiarity of their chargers and the foreign style of their equipments.