. The Cuba review. THE CUBA REVIEW IT developed the ore bodies through a number of shafts to a depth of 1,000 feet or 1,200 feet vertically, and by drifts and cross-cuts to a lateral extent of several miles. The troubles of the 'ten years war' and the difficulty of handling the water caused this company to suspend operations. "After the close of the Spanish-American war an American company came into pos- session of the property. They have partially unwatered it, possibly to a depth of 500 feet to 600 feet at present. After some expensive and unprofitable experiences in the way of smelting
. The Cuba review. THE CUBA REVIEW IT developed the ore bodies through a number of shafts to a depth of 1,000 feet or 1,200 feet vertically, and by drifts and cross-cuts to a lateral extent of several miles. The troubles of the 'ten years war' and the difficulty of handling the water caused this company to suspend operations. "After the close of the Spanish-American war an American company came into pos- session of the property. They have partially unwatered it, possibly to a depth of 500 feet to 600 feet at present. After some expensive and unprofitable experiences in the way of smelting, leaching and concentrating, they have apparently settled down to mining and shipping the high-grade ores. "By official reports, they shipped about 60,000 tons in 1909 and are now shipping 6,000 tons monthly. Their superintendent states "that all ores of copper are found from the red and black oxides in the gossan to native copper of considerable quantities in the top of the sulphides down to clean ; The depth of the enriched zone of the sulphides has never been determined. It occupies at least the area from the 100-foot level to below the 600-foot level. In this area occur large lenses of three and one-half per cent ore containing shoots of very rich sulphides. One slope on the 550-foot level yielded 22 per cent ore. As, at the time when the lowest workings were mined, only ore of a high grade could be handled, it is safe to assume that the zone of enrichment extended this far. Official records in Santiago show that from 1830 to 1S60 this mine is credited with a production of some $50,000,000. "At present Cobre is the only productive copper mine in the island, yet ores of copper are abundant and very widely disseminated. Throughout the Sierra Alaestra range and in general in all of the mountain districts copper float is abundant. A few miles to the eastward of Cobre, boulders of amygdaloid basalt occur with native copper amygdules. This forma
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