The deposits of manganese ore examined in Cuba are rather diverse, but may be grouped into three general physical types--buried deposits, irregular masses associated with silicious rock or “jaspar,” and deposits in residual clay. The buried deposits comprise several varieties, one of the most common being of poorly consolidated beds of sandy chloritic material, cemented, with manganese oxides, that fill inequalities in the surface of hard rocks. Other bedded deposits clearly replace limestone, shale conglomerate or other rocks, and tabular masses of ore are interbedded with strata of nearly horizontal limestone. The ore consists largely of Pyrolusite, but many deposits contain Psilomelane, Manganite and Wad, or mixtures of all these materials. The richness of the deposits varies considerably. Most of the richest masses are associated with the “jaspar,” but masses that have replaced limestone are also very rich. The deposits of manganese examined in the Santiago district comprise the Ponupo Group, the Ysobelita, Botsford, Boston, Pilar, Dolores, Laura, San Andrea, Cauto or Abundancia, Llave and Gloria Mines, together with the Caridad and Valle prospects. All of these properties except the two prospects are producing ore. The Ponupo, Ysobelita and Boston mines were opened many years ago and have produced a large quantity of ore. The Ponupo and Ysobelita are still relatively large producers, though the grade of ore is not so high as that shipped in the earlier days. The Ponupo mine is connected with the Cuba Railroad at La Maya by a branch two miles long, and a narrow gauge track from Cristo, on the Cuba Railroad, runs to the Ysobelita mine three miles distant. Extensions of this line to the Boston and Pilar mines can be made with little additional outlay. The Dolores and Laura mines are near the Guantanamo & Western Railroad, not far from Sabanilla station, and the Cauto mine is adjacent to the Cuba Railroad at Manganeso Station. The other mines are from one to eight miles from the railroad, to which the ore is hauled mainly by oxcarts. In the rainy season these roads are impassable, and even in the dry season they include many difficult places, so that the quantity of the output is much less than could be mined under different circumstances. The ore is mined by hand, mostly from open cuts, though short drifts and tunnels have been run into lenses of ore at the Ponopu, Cauto and Laura mines, and a slope has been driven on a thin tabular mass of ore between strata of limestone, dipping about 34 degrees, at the Botsford.