Crosby Garrett Helmet some point the helmet was repaired using a bronze sheet which was riveted across two splits. Only two other Roman helmets complete with visors have been found in Britain – the Newstead Helmet and Ribchester Helmet. The helmet and visor were cast from an alloy consisting of an average of 82% copper, 10% zinc and 8% tin. This alloy was probably derived from melted-down scrap brass with a low zinc content, with which some tin had been added to improve the quality of the casting. Some of the fragments show traces of a white metal coating, indicating that the visor
Sundown Tin and Copper Mine 26 tons of copper concentrates were produced. Work carried out in 1916-17 included the construction of flues for saving arsenic, the electric lighting of the mines and mill, the construction of a new concrete dam, a new elevated double rope line form the new tin shaft to the mill, new self feeders at the mill, and the redressing works was to be remodelled and shifted from its present location at the mill to the calciner. The battery consisted of the 10 head stamper, 4 classifiers, 5 Wilfley tables, 2 Berdan pans and several buddles. The single reverberatory furnace was used