. Mining and Scientific Press . the advantage of two digging edges, one of which is equipped with teeth for combing out the chunks. This scraper is a favorite with the miners, and is suitable for both haul and soft ground. When loading into chutes thes,. scrapers have a capacity of 30 tons per hour from At the Cliffs shaft mine of the Cleveland-Cliffs IronCo., which is a producer of hard specular ore of highspecific gravity, I was experimenting with scrapers np to the time the mine was closed, on June 1. 1921, The oreat this mine breaks into large pieces, which often weighfrom 500 to 1000 lb.,
. Mining and Scientific Press . the advantage of two digging edges, one of which is equipped with teeth for combing out the chunks. This scraper is a favorite with the miners, and is suitable for both haul and soft ground. When loading into chutes thes,. scrapers have a capacity of 30 tons per hour from At the Cliffs shaft mine of the Cleveland-Cliffs IronCo., which is a producer of hard specular ore of highspecific gravity, I was experimenting with scrapers np to the time the mine was closed, on June 1. 1921, The oreat this mine breaks into large pieces, which often weighfrom 500 to 1000 lb., and is difficult to handle. Heavyequipment was necessary, but under favorable conditionsexcellent residts were obtained. Two types of scrapers teeth and one u itlmut. sketches ofh are show n in )- ig B and 9. The it li teeth worked i large pi I. s ..f coarse ore. and under irable conditions ; , much as l11 tons in an into a chni. Recently various ty] rapei have been pui on the mark I ud and gravel, some of which FIGURE 9. SCRAPER FOR HARD ORE
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