High grade ore may be selected in mining the richer parts of these deposits, but most of it requires mechanical treatment, such as long washing and jigging to free it from clay, sand and other impurities. At one mine the ore is cleaned by raking over a horizontal screen in a stream of water. Log washers are in operation at some mines and under construction at others. At one time a system of washing, screening and jigging is employed. They daily production of manganese ore in March, 1918, from this district, was about 300 tons. The approximate average composition of the ore now shipped is as follows: Manganese 38.885% Silica 12.135% Phosphorus .084% Moisture 11.201% The greater part of the manganese ore from this district contains from 36% to 45% manganese, a few thousand tons running over 45%. The manganese deposits examined by Messrs. Burch and Burchard south of Bayamo consist of the Manuel, Costa group, 18 to 23 miles by wagon road southwest of Bayamo; the Francisco and Cadiz groups, 15 and 20 miles southeast of the same city; and Guinea, Llego and Charco Redondo, seven to eight miles southeast of Santa Rite; and the Adriano and San Antonio mines, 9 to 10 miles south of Bayari. Other deposits, further to the southeast, are in what is known as the Los Negros district. But little mining has been done so far in this district. Deposits of milling ore are available and will undoubtedly be developed later if prices remain favorable. It was estimated in April, 1918, that the output of manganese from this district, during 1918, would not exceed 12,000 tons, half of which would be high-grade ore carrying from 45% to 55% of manganese. Later developments, however, indicated a much larger output. The reserve of manganese ore in this section was estimated at about 50,000 tons, but this does not include the Los Negros district which lies further southeast, 25 to 35 miles from the railroad. Engineers who have examined this zone believe that with good transportation facilities it will yield a large output of high-grade ore from many small deposits. Aside from difficult transportation facilities in some districts, one of the chief obstacles in the way of a large yield of ore from the mines has resulted from an inability to hold a sufficient number of miners at certain mines, owing to an inadequate supply of foodstuffs. Many workmen preferred to work in the sugar mills where good food was more readily obtained and living conditions were easier. Lack of explosives also handicapped mining in some districts. The building of narrow gauge railroads in which the Cuban Federal Government will probably assist will greatly contribute to the successful or profitable mining of manganese in the Province of Oriente. The fact that most of the ore is removed during the dry season, when the Cuba Company’s roads are taxed to the limit in conveying sugar cane to the mills, also renders transportation by rail rather uncertain.