Journal - South African Institute of Mining and Metallurgy . erved in 8]dams, and a plant was erected for their was designed on the old lines favoured oytin streamers. It consists ol 3 settling100 ft. long, 9 ft. wide, and 8 ft. deep, in whichthe slimes are allowed to settle and the surpluswater is eliminated. These are followed by 150iag frames in 3 double rows, and occupying aspace of about 145 ft. x 40 ft. The frames areworked by means of the surplus water from thesettling pits, and they are a very old and well-known Cornish contrivance, which is stillextensively used for fin
Journal - South African Institute of Mining and Metallurgy . erved in 8]dams, and a plant was erected for their was designed on the old lines favoured oytin streamers. It consists ol 3 settling100 ft. long, 9 ft. wide, and 8 ft. deep, in whichthe slimes are allowed to settle and the surpluswater is eliminated. These are followed by 150iag frames in 3 double rows, and occupying aspace of about 145 ft. x 40 ft. The frames areworked by means of the surplus water from thesettling pits, and they are a very old and well-known Cornish contrivance, which is stillextensively used for fine tin concentration, and adescription would probably be superfluous. Theworking details of a rag table are given in Fig. VI quantity of water required to work eachframe is about 95 gallons per hour. The mainwashing box is allowed to till and tip in 4minutes, during which the pulp flows over andsets concentrated and the balance box in 14 sec. 17- The Journal of The Chemical, Metallurgical and Mining Society of South Africa. Dec. 190T CORNISH RAC TABLE. DETAILS OF CORNISH RAG TABLE * Sot* Sea As oj /7g J7 FIG. VII. Th- fjuantities and speeds may however beregulated, according to the ijuality and quantityof slimes treated. The rag frames are followed by 5 more settlingpits 20 ft. long, 9 ft. wide, and -5 ft. deep, andby another set of 60 frames. From these,and after partial settlement, the slimespass on to two Acme tables. 20 ft. indiameter. The concentrates are then cleaned upin a concave buddle, 8 ft. in diameter, and finallytossed in kieves. The plant, with tin- exceptionof the tables and buddle, is automatic and requireslittle attendance. The hands employed arc as follows :— Twonativesattending the filling of the differentpits and their discharge; 3 attending thesweeping of the two sets of rag frames, 1 attend-ing the Acme tables, and 1 white supervisor. The plant is capable of dealing with 30 tons ofclimes per day. Considerable difficulty has been experienced •in ob
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